CN115683688A - Microchannel heat exchanger flow distribution characteristic measuring device, method, equipment and medium - Google Patents
Microchannel heat exchanger flow distribution characteristic measuring device, method, equipment and medium Download PDFInfo
- Publication number
- CN115683688A CN115683688A CN202310010722.4A CN202310010722A CN115683688A CN 115683688 A CN115683688 A CN 115683688A CN 202310010722 A CN202310010722 A CN 202310010722A CN 115683688 A CN115683688 A CN 115683688A
- Authority
- CN
- China
- Prior art keywords
- heat exchanger
- flow distribution
- measured
- micro
- branch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a device, a method, equipment and a medium for measuring the flow distribution characteristics of a microchannel heat exchanger, belonging to the technical field of flow measurement, wherein the device comprises a control mechanism, a clamping mechanism, a camera mechanism and a pressure stabilizing mechanism; the control mechanism is used for controlling thermal parameters so as to ensure that the inlet of the heat exchanger to be tested is in a design working condition; the clamping mechanism is used for fixing the heat exchanger to be measured and performing visual flow distribution measurement; the camera shooting mechanism is used for shooting the motion condition of the downstream trace particles of the heat exchanger to be detected and calculating the flow distribution condition of the heat exchanger to be detected; the control mechanism and the clamping mechanism are connected through a pipeline to form a loop which is used as an experimental branch; the pressure stabilizing mechanism is connected to the experiment branch as the branch of aerifing, provides working medium and stabilizes the overall pressure of experiment branch for the experiment branch. According to the invention, the flow distribution conditions of different positions of the micro-channel heat exchanger are measured and obtained, so that a technical support is provided for the research of the heat transfer performance of the micro-channel heat exchanger.
Description
Technical Field
The invention relates to the technical field of flow measurement, in particular to a device, a method, equipment and a medium for measuring flow distribution characteristics of a micro-channel heat exchanger.
Background
The heat exchanger is general process equipment for allocating energy among different material flows and completing heat transportation, is widely applied to a large number of industries such as power generation, chemical engineering, power, metallurgy and the like, and particularly has an important effect on transferring and allocating energy among working media in a power circulation system taking supercritical carbon dioxide as the working media.
With the continuous improvement of the technological level, people pay more and more attention to the special application scenes of power systems related to nuclear power stations, thermal power stations and aircraft engines, and the reduction of equipment volume, the improvement of efficiency, the reduction of equipment manufacturing and operating cost and the reduction of natural resource consumption are one of the directions of future development of heat exchangers. The heat exchangers currently used in the conventional industrial field mainly include shell-and-tube heat exchangers, double-tube heat exchangers, plate-fin heat exchangers and the like, which cannot simultaneously meet the requirements of large heat exchange specific surface area, high welding strength and small volume. In recent years, with the improvement of the industrial manufacturing level, the micro-channel heat exchanger taking high-precision chemical etching and vacuum diffusion welding as the process core gradually moves to the application stage, the micro-channel has small size and high compactness, the welding mode has no welding slag, the strength of the joint is close to that of the base metal, and the micro-channel heat exchanger has obvious advantages. However, in the process of actually testing the microchannel heat exchanger, it is found that the heat exchanger has tiny and huge channels, and the working medium has high flow velocity under the operating condition, so that the degree of abrasion of the working medium to the heat exchanger is related to the position, and the flow distribution at different positions is not uniform, and even the heat transfer performance is influenced.
However, the micro-channel compact heat exchanger is integrally formed by diffusion welding, the sectional area is often large, the number of micro-channels is very large, and the existing experimental device can only measure the flow after collection, and cannot measure the flow at different positions.
Disclosure of Invention
The invention provides a device for measuring the flow distribution characteristics of a micro-channel heat exchanger, which aims to research the influence of flow distribution at different positions of the micro-channel heat exchanger on heat transfer performance so as to improve the heat transfer performance of the micro-channel heat exchanger. According to the invention, the flow distribution conditions of different positions of the micro-channel heat exchanger are measured and obtained, so that a technical support is provided for the research of the heat transfer performance of the micro-channel heat exchanger.
The invention is realized by the following technical scheme:
a micro-channel heat exchanger flow distribution characteristic measuring device comprises a control mechanism, a clamping mechanism, a camera shooting mechanism and a pressure stabilizing mechanism;
the control mechanism is used for controlling the thermal parameters to ensure that the inlet of the heat exchanger to be tested is in a design working condition;
the clamping mechanism is used for fixing the heat exchanger to be measured and performing visual flow distribution measurement;
the camera shooting mechanism is used for shooting the motion condition of the downstream trace particles of the heat exchanger to be detected and calculating the flow distribution condition of the heat exchanger to be detected;
the control mechanism and the clamping mechanism are connected through a pipeline to form a loop which is used as an experimental branch; the pressure stabilizing mechanism serves as an inflation branch and is connected to the experiment branch, so that working media are provided for the experiment branch, and the overall pressure of the experiment branch is stabilized.
Compared with the traditional total flow measuring device, the measuring device provided by the invention can realize the measurement of the flow distribution characteristics of the micro-channel heat exchangers with different structures through the modularized design and the visual flow distribution measuring technology. Meanwhile, the invention adopts a modular design, thereby being convenient for installation and maintenance. According to the invention, the quick replacement of different types of bodies to be tested can be realized through the clamping mechanism, the device can be suitable for measuring the flow distribution characteristics of various types of micro-channel heat exchangers, and the application range is wide; in addition, only through dismouting fixture, can realize the change of the heat exchanger body that awaits measuring, and other module devices need not dismouting again to measurement of efficiency has been improved.
As a preferred embodiment, the control mechanism of the present invention comprises a cooler, a drive pump, a particle generator, a preheater, a regulating valve, and a stop valve;
the cooler, the driving pump, the particle generator and the preheater are connected through pipelines;
the regulating valve is arranged at a downstream position of the preheater;
the stop valve is arranged between the cooler and the driving pump to control the experiment branch switch;
the cooler is also connected with cooling liquid through a pipeline;
the particle generator is used for throwing trace particles into the experiment branch pipeline;
the preheater is used for heating the flowing working medium.
According to the invention, by arranging the control mechanism comprising the preheater, the regulating valve and other devices, the adjustable parameters of the working medium such as temperature, pressure and the like can be realized, and the controllability of the measuring device is improved, so that the accuracy and the reliability of the measurement are ensured.
As a preferred embodiment, the clamping mechanism comprises a heat exchanger to be tested, a visual clamping device and a clamping bolt and nut;
the visual clamping device is a cavity container made of transparent materials and comprises an upstream part and a downstream part, wherein the upstream part simulates a heat exchanger end socket to be semicircular, the length of the downstream part is greater than a turbulence influence distance, and the two parts have the same size as the cross section of the heat exchanger to be measured;
the heat exchanger to be tested and the visual clamping device are fixed into a whole by the clamping bolt and the clamping nut, the upstream part of the whole is connected with the downstream of the control mechanism through a pipeline, and the downstream part of the whole is connected with the upstream of the control mechanism through a pipeline.
The detachable clamping mechanism is arranged, so that the heat exchanger body to be tested can be conveniently disassembled and assembled, different types of heat exchanger bodies to be tested can be replaced according to actual requirements, and the heat exchanger flow distribution measuring device can be widely applied to heat exchanger flow distribution measurement of various types of structures.
As a preferred embodiment, the image pickup mechanism of the present invention includes a light source and a camera;
the light source and the camera are respectively arranged on two opposite sides of the clamping mechanism;
the light source is used for generating pulse laser, and the pulse laser forms a sheet light source to irradiate the clamping mechanism after passing through the optical reflection system;
the camera is used for shooting the positions of particles on the downstream section to be measured of the clamping mechanism, so that the movement velocity field and the flow distribution condition of the fluid downstream of the heat exchanger to be measured are obtained.
The invention adopts a high-speed camera shooting technology, can obtain a more accurate and reliable fluid motion speed field, and further improves the accuracy and reliability of measurement.
As a preferred embodiment, the pressure stabilizing mechanism of the invention comprises a pressure stabilizer, a pressure stabilizing gas cylinder and a stop valve which are connected in sequence;
the pressure stabilizing mechanism is connected into the experiment branch through the stop valve;
the pressure stabilizing gas bottle is used for providing pressure stabilizing gas for the pressure stabilizer.
The embodiment of the invention ensures the stability of the internal pressure of the system and the accuracy and the reliability of the measurement through the pressure stabilizing device.
In a preferred embodiment, the working fluid of the present invention is carbon dioxide, helium, argon, water, blood or sodium chloride.
As a preferred embodiment, at least a part of the clamping mechanism of the present invention is made of a transparent material, and the transparent material is acrylic or glass.
As a preferred embodiment, the tracer particles of the present invention use glass beads or soot particles and have a diameter of 1 μm to 1mm.
In a second aspect, the present invention further provides a measurement method based on the measurement apparatus, where the method includes:
after the working medium is charged into the experimental branch through the charging branch, the pressure-stabilizing gas is charged into the experimental branch to enable the working medium to reach a preset pressure;
starting the control mechanism, and controlling the temperature, pressure, flow and trace particle concentration of the working medium at the inlet of the clamping mechanism to reach preset values;
starting the camera shooting mechanism to shoot the motion state of the tracer particles in the working medium in the clamping mechanism;
and obtaining the downstream particle speed distribution of the heat exchanger to be measured according to the shooting result, thereby calculating the flow distribution condition of the heat exchanger to be measured.
As a preferred embodiment, the method further comprises the following steps before the step of charging the working medium:
carrying out a tightness check on the measuring device: detecting whether the tightness of the measuring device meets the requirement or not;
and (3) carrying out calibration test on the camera shooting mechanism: detecting whether each device of the camera shooting mechanism normally operates;
and performing functional test on the control mechanism: and determining whether the basic functions of the devices of the control mechanism are intact or not and whether the operation requirements in the test are met or not.
In a third aspect, the present invention provides a data processing method based on the above measuring apparatus, including:
acquiring the flow of all areas on the section to be measured through a camera mechanism;
calculating the average flow of the section to be measured according to the average flow of all the areas;
calculating to obtain a flow distribution coefficient according to the flow of all areas on the section to be measured and the average flow of the section to be measured obtained through calculation;
by changing the test parameters, the flow distribution characteristic curve of the heat exchanger to be tested can be obtained.
As a preferred embodiment, the flow distribution coefficient of the heat exchanger structure to be measured is calculated by the following formula:
in the formula (I), the compound is shown in the specification,LF（Re，μ) Is composed ofReAndμa lower flow distribution coefficient;
the average flow value of the section to be measured is obtained;q(i,j)is a small area(i,j)The size of the flow rate of (a) is,Rerepresenting the magnitude of fluid turbulence;μrepresenting the magnitude of the fluid viscosity; wherein the content of the first and second substances,Reandμrelated to flow rate, temperature, pressure and kind of working medium;Mthe number of small areas per row for which the cross section to be measured is discrete,Nis the discrete line number of the section to be measured.
In a fourth aspect, the present invention provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the data processing method when executing the computer program.
In a fifth aspect, the invention proposes a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned data processing method.
The invention has the following advantages and beneficial effects:
compared with the traditional total flow measurement technology, the method can measure the flow distribution condition of the micro-channel heat exchangers with different structures, and is widely suitable for the performance research of the micro-channel heat exchangers with different structures.
The invention has the advantages of simple structure, convenient installation, quick measurement and the like.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural diagram of a measurement apparatus according to an embodiment of the present invention.
Reference numbers and corresponding part names in the drawings:
the method comprises the following steps of 1-a body to be tested, 2-a visual clamping device 3-a cooler, 4-a driving pump, 5-a particle generator, 6-a regulating valve, 7-a preheater, 8-a light source, 9-a camera, 10-a voltage stabilizer, 11-a voltage stabilizing gas cylinder, 12-a clamping bolt nut and 13-a stop valve.
Detailed Description
Hereinafter, the term "comprising" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to mean that the specified features, numbers, steps, operations, elements, components, or combinations of the foregoing, are only meant to indicate that a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to the possibility of, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. In contrast, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as terms defined in a commonly used dictionary) will be construed to have the same meaning as the contextual meaning in the related art and will not be construed to have an idealized or overly formal meaning unless expressly so defined in various embodiments of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and the accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limiting the present invention.
Example (b):
in order to research the influence of the flow distribution conditions at different positions of the micro-channel compact heat exchanger on the heat transfer performance of the micro-channel compact heat exchanger, the embodiment of the invention provides a micro-channel heat exchanger flow distribution characteristic measuring device, which comprises:
and the control mechanism is used for controlling thermal parameters such as concentration of tracer particles, flow of working medium, temperature and pressure and the like so as to ensure that the inlet is in a design working condition.
And the clamping mechanism is used for integrally fixing the body to be measured and the measuring device and carrying out flow distribution measurement through the visual part.
And the camera shooting mechanism is used for shooting the motion situation of the downstream trace particles of the body to be detected and calculating the flow distribution situation.
And the pressure stabilizing mechanism is used for stabilizing the overall pressure of the measuring device and ensuring the safety and stability of the measuring device and the accuracy of measurement without great change along with the operation temperature and the flow.
The control mechanism, the clamping mechanism and the pressure stabilizing mechanism of the embodiment are all connected through pipelines. The control mechanism and the clamping mechanism form an experiment branch of the measuring device, and the pressure stabilizing mechanism is used as an inflation branch and is connected to the experiment branch.
As shown in fig. 1, the control mechanism of the present embodiment includes a cooler 3, a driving pump 4, a particle generator 5, a preheater 7, a regulating valve 6, and a stop valve 13; the cooler 3, the driving pump 4, the particle generator 5 and the preheater 7 are sequentially connected and fixed through pipelines along the flow direction of a working medium, the regulating valve 6 is installed at the downstream position of the preheater 7 to accurately control the flow of the measuring device, the stop valve 13 is installed between the cooler 3 and the driving pump 4 to control the experimental branch switch, and the stop valve 13 is installed between the voltage stabilizer 10 and the driving pump 4 to control the inflation branch switch.
In a specific application of the control mechanism of the embodiment, the cooler 3 is connected with the cooling liquid through a pipeline. The particle generator 5 is charged with trace particles at the upper part. The preheater 7 is connected with electrodes at two ends through cables, so that the working medium is heated. A regulating valve 6 is connected between the preheater 7 and the clamping mechanism to control the total flow rate of the measuring device.
The clamping mechanism of this embodiment includes body 1, visual clamping device 2, centre gripping bolt nut 12 that awaits measuring. The body to be measured 1 is a micro-channel compact heat exchanger, and simple replacement measurement can be realized according to the structure of the micro-channel to be measured. The visual clamping device 2 is a cavity container made of transparent materials, the visual clamping device 2 is composed of an upstream part and a downstream part, the upstream part simulates the end socket of the heat exchanger to be semicircular, the length of the downstream part is far larger than the turbulent flow influence distance, and the two parts are the same as the cross section of the body to be measured 1 in size. The clamping bolt nut 12 is a double-ended stud with a nut, the body 1 to be measured is arranged between the upstream part and the downstream part, and the upstream part and the downstream part of the visual clamping device 2 are compressed by tightening the nut to fix the body 1 to be measured.
The imaging mechanism of the present embodiment includes a light source 8 and a camera 9. The light source 8 can emit pulse laser with fixed energy, and after being reflected by the optical system, the pulse laser forms a sheet light source to illuminate the internal space of the visual clamping device 2, and the camera 9 can shoot the position of an illuminated area. The light source 8 and the camera 9 are respectively installed on two sides of the visual clamping device 2, during experiments, single pulse laser emitted by the light source 8 forms a sheet-shaped light source to irradiate all tracing particles on one cross section in the visual clamping device 2 after reflection and scattering, and the camera 9 can calculate the movement speed field and the flow distribution condition of the downstream fluid of the body to be measured by continuously shooting the positions of the particles on the cross section of the light source in a short time.
The pressure stabilizing mechanism of the present embodiment includes a pressure stabilizer 10 and a pressure stabilizing gas cylinder 11. Wherein, the pressure stabilizer 10 is connected with the pressure stabilizing gas bottle through a pipeline, and the pressure stabilizing gas bottle 11 is used for filling pressure stabilizing gas into the pressure stabilizer 10. After the measuring device is filled with the working medium to be measured, the pressure stabilizing gas is filled in to ensure that the pressure in the measuring device is basically stable, and the voltage stabilizer 10 is connected to the experiment branch through the stop valve and the pipeline.
Furthermore, the working medium which can be measured by the embodiment of the invention comprises gases such as carbon dioxide, helium, argon and the like, and liquids such as water, blood, sodium chloride solution and the like.
In another preferred embodiment, the connection sequence of the devices in the measuring device can be changed, increased or decreased without affecting the normal use, such as the number and positions of the stop valve and the regulating valve, and the material of the connecting pipeline can be metal, nonmetal, etc.
Furthermore, the body to be tested of the embodiment of the invention comprises micro-channel compact heat exchangers with various internal structures, various sizes and various cross-sectional shapes including rectangle, square or circle.
Further, the transparent material used by the visual clamping mechanism 2 of the embodiment of the present invention may be acrylic, glass, or the like.
Further, the cooler used in the embodiment of the present invention includes, but is not limited to, various cooling devices such as a coiled pipe heat exchanger or a double pipe heat exchanger, and the cooling liquid includes, but is not limited to, water or oil.
Further, the driving pump used in the embodiment of the present invention includes, but is not limited to, a centrifugal pump or a magnetic pump, etc.
Furthermore, the tracer particles used in the embodiment of the invention include, but are not limited to, glass beads or soot particles and other particles with good followability, and the diameter is in the range of 1 μm to 1mm.
Further, the pre-heater used in the embodiment of the present invention includes, but is not limited to, direct heating or indirect heating.
Further, the pressure-stabilizing gas used in the embodiment of the present invention includes, but is not limited to, nitrogen or helium, and other inert gases.
Further, the light source and the camera of the embodiment of the invention can adopt a single-pulse ruby laser and a high-speed camera in a distributed mode.
The flow distribution condition measurement at different positions is realized based on the measuring device, and the specific process comprises the following steps:
the clamping mechanism, the cooler 3, the stop valve 13, the driving pump 4, the particle generator 5, the preheater 7 and the regulating valve 6 are sequentially connected to form a loop as an experimental branch; a pressure stabilizing gas cylinder 11, a pressure stabilizer 10 and a stop valve 13 are sequentially connected to form a gas filling branch connected between a cooler 3 and the stop valve 13 of an experiment branch; the light source 8 and the camera 9 are respectively arranged at two sides of the visual clamping device 2.
After the working medium for measurement is charged into the experimental branch through the charging branch, the working medium is charged with the stabilized pressure gas to reach the design pressure (the charging step is as follows, firstly, the container 11 containing the working medium is used for charging the whole loop through the voltage stabilizer 10 until the system pressure is increased to be close to the design pressure, secondly, the container 11 containing the stabilized pressure gas is replaced, and the loop is also injected with gas through the voltage stabilizer 10, and because the two gases can not be mixed, the stabilized pressure gas compresses the working medium downwards from the upper end inlet of the voltage stabilizer 10, so that the system pressure reaches the design pressure, and the charging is completed); starting the driving pump until the working medium in the measuring device runs stably;
starting and adjusting the preheater 7 and the particle generator 5, and controlling the temperature, the pressure, the flow and the concentration of trace particles of the working medium to be detected at the inlet of the visual clamping device 2 to reach preset values;
starting a camera shooting mechanism to shoot the motion state of tracer particles in the fluid in the visual clamping device 2;
and finally, obtaining the particle speed distribution of the section to be measured through the motion state of the shot tracer particles, and calculating to obtain the flow distribution condition of the body to be measured.
In addition, the embodiment of the invention can also check the tightness of the measuring device before the working medium to be measured is filled, namely, whether the tightness of the measuring device meets the measuring requirement is detected, so that the measuring accuracy and reliability are ensured.
The embodiment of the invention can also carry out calibration test on the camera shooting mechanism before the working medium to be detected is filled, namely whether the high-speed camera shooting instrument and the light source normally operate is detected, the fixed particle concentration and the water working medium can be adopted for measurement, and whether the particle concentration and the put-in concentration are the same is calculated according to the shooting result through the result of the high-speed camera shooting instrument, so that whether the high-speed camera shooting instrument and the light source normally operate is detected.
The embodiment of the invention can also perform functional test on the control mechanism before the working medium to be tested is filled, namely, whether the basic functions of equipment such as a driving pump, a preheater and the like in the control mechanism are intact or not is determined, and whether the operation requirements in the test can be met or not is determined.
In the embodiment of the invention, the flow distribution characteristic calculation process of the body to be measured is as follows:
the flow distribution number LF is calculated by the formula:
wherein the content of the first and second substances,
the average flow value of the section to be measured is obtained.
qRepresenting the size of the traffic in a small area.
ReRepresenting the magnitude of the fluid turbulence.
μRepresenting the magnitude of the fluid viscosity.
The cross section to be measured of the body to be measured is a rectangle with the size of M x N, and the spatial resolution of the camera mechanism is a x a, so that the whole cross section to be measured can be dispersed into M x NMThe number of small areas per row for which the cross section to be measured is discrete,Nfor discrete number of rows of cross-section to be measured) A small area, where M = M/a and N = N/a. A working medium is used, the drive pump is adjusted to change the flow rate, and the flow rate q (i, j) of all areas on the section to be measured can be obtained through the camera shooting mechanism, wherein i is larger than or equal to 1 and is smaller than or equal to M, and j is larger than or equal to 1 and is smaller than or equal to N. A certain fixed Re and μ can be obtained by flow measurement according to the formula shown in equation (1) (wherein,Reandμrelated to the flow velocity, temperature, pressure and kind of the working medium) and a family of curves, namely the flow distribution characteristics of the body to be tested, can be obtained by changing the test parameters.
The present embodiment also proposes a computer device for executing the flow rate distribution characteristic calculation process of the present embodiment.
The computer equipment comprises a processor, an internal memory and a system bus; various device components including internal memory and processors are connected to the system bus. A processor is hardware used to execute computer program instructions through basic arithmetic and logical operations in a computer system. An internal memory is a physical device used to temporarily or permanently store computing programs or data (e.g., program state information). The system bus may be any of several types of bus structures including a memory bus or memory controller, a peripheral bus, and a local bus. The processor and the internal memory may be in data communication via a system bus. Including read-only memory (ROM) or flash memory (not shown), and Random Access Memory (RAM), which typically refers to main memory loaded with an operating system and computer programs.
Computer devices typically include an external storage device. The external storage device may be selected from a variety of computer readable media, which refers to any available media that can be accessed by the computer device, including both removable and non-removable media. For example, computer-readable media includes, but is not limited to, flash memory (micro SD cards), CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer device.
A computer device may be logically connected in a network environment to one or more network terminals. The network terminal may be a personal computer, a server, a router, a smart phone, a tablet, or other common network node. The computer device is connected to the network terminal through a network interface (local area network LAN interface). A Local Area Network (LAN) refers to a computer network formed by interconnecting within a limited area, such as a home, a school, a computer lab, or an office building using a network medium. WiFi and twisted pair wiring ethernet are the two most commonly used technologies to build local area networks.
It should be noted that other computer systems including more or less subsystems than computer devices can also be suitable for use with the invention.
As described above in detail, the computer device adapted to the present embodiment can perform the specified operation of the flow distribution characteristic calculation process. The computer device performs these operations in the form of software instructions executed by a processor in a computer-readable medium. These software instructions may be read into memory from a storage device or from another device via a local area network interface. The software instructions stored in the memory cause the processor to perform the method of processing group membership information described above. Furthermore, the invention can be implemented by hardware circuitry or by a combination of hardware circuitry and software instructions. Thus, implementation of the present embodiments is not limited to any specific combination of hardware circuitry and software. The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (14)
1. A micro-channel heat exchanger flow distribution characteristic measuring device is characterized by comprising a control mechanism, a clamping mechanism, a camera shooting mechanism and a pressure stabilizing mechanism;
the control mechanism is used for controlling thermal parameters to ensure that the inlet of the heat exchanger to be tested is in a design working condition;
the clamping mechanism is used for fixing the heat exchanger to be measured and performing visual flow distribution measurement;
the camera shooting mechanism is used for shooting the motion condition of the downstream trace particles of the heat exchanger to be detected and calculating the flow distribution condition of the heat exchanger to be detected;
the control mechanism and the clamping mechanism are connected through a pipeline to form a loop as an experiment branch; the pressure stabilizing mechanism serves as an inflation branch and is connected to the experiment branch to provide working media for the experiment branch and stabilize the overall pressure of the experiment branch.
2. The device for measuring the flow distribution characteristics of the micro-channel heat exchanger as claimed in claim 1, wherein the control mechanism comprises a cooler, a driving pump, a particle generator, a preheater, a regulating valve and a stop valve;
the cooler, the driving pump, the particle generator and the preheater are connected through pipelines;
the regulating valve is arranged at a downstream position of the preheater;
the stop valve is arranged between the cooler and the driving pump to control the experiment branch switch;
the cooler is also connected with cooling liquid through a pipeline;
the particle generator is used for throwing trace particles into the experiment branch pipeline;
the preheater is used for heating the flowing working medium.
3. The device for measuring the flow distribution characteristics of the micro-channel heat exchanger according to claim 1, wherein the clamping mechanism comprises a heat exchanger to be measured, a visual clamping device and a clamping bolt and nut;
the visual clamping device is a cavity container made of transparent materials and comprises an upstream part and a downstream part, wherein the upstream part simulates a heat exchanger end socket to be semicircular, the length of the downstream part is greater than a turbulence influence distance, and the two parts have the same size as the cross section of the heat exchanger to be measured;
the heat exchanger to be tested and the visual clamping device are fixed into a whole by the clamping bolt and the clamping nut, the upstream part of the whole is connected with the downstream of the control mechanism through a pipeline, and the downstream part of the whole is connected with the upstream of the control mechanism through a pipeline.
4. The device for measuring the flow distribution characteristics of the micro-channel heat exchanger according to claim 1, wherein the camera mechanism comprises a light source and a camera;
the light source and the camera are respectively arranged on two opposite sides of the clamping mechanism;
the light source is used for generating pulse laser, and the pulse laser forms a sheet light source to irradiate the clamping mechanism after passing through the optical reflection system;
the camera is used for shooting the positions of particles on the downstream section to be measured of the clamping mechanism, so that the movement speed field and the flow distribution condition of the downstream fluid of the heat exchanger to be measured are obtained.
5. The micro-channel heat exchanger flow distribution characteristic measuring device according to claim 1, wherein the pressure stabilizing mechanism comprises a pressure stabilizer, a pressure stabilizing gas cylinder and a stop valve which are connected in sequence;
the pressure stabilizing mechanism is connected to the experiment branch through the stop valve;
the pressure stabilizing gas bottle is used for providing pressure stabilizing gas for the pressure stabilizer.
6. The device for measuring the flow distribution characteristics of the micro-channel heat exchanger according to any one of claims 1 to 5, wherein the working medium is carbon dioxide, helium, argon, water, blood or sodium chloride.
7. The device for measuring the flow distribution characteristics of the micro-channel heat exchanger according to any one of claims 1 to 5, wherein at least part of the clamping mechanism is made of a transparent material, and the transparent material is acrylic or glass.
8. The device for measuring the flow distribution characteristics of the micro-channel heat exchanger according to any one of claims 1 to 5, wherein the tracer particles are glass beads or soot particles and have a diameter of 1 μm to 1mm.
9. The method for measuring the flow distribution characteristic of the micro-channel heat exchanger based on any one of claims 1 to 8, is characterized by comprising the following steps:
after the working medium is charged into the experimental branch through the charging branch, the pressure-stabilizing gas is charged into the experimental branch to enable the working medium to reach a preset pressure;
starting the control mechanism, and controlling the temperature, pressure, flow and trace particle concentration of the working medium at the inlet of the clamping mechanism to reach preset values;
starting the camera shooting mechanism to shoot the motion state of the tracer particles in the working medium in the clamping mechanism;
and obtaining the downstream particle speed distribution of the heat exchanger to be measured according to the shooting result, thereby calculating the flow distribution condition of the heat exchanger to be measured.
10. The method of measurement according to claim 9, further comprising, prior to the step of charging the working fluid:
performing a leak tightness check on the measuring device; detecting whether the tightness of the measuring device meets the requirement;
and (3) carrying out calibration test on the camera shooting mechanism: detecting whether each device of the camera shooting mechanism normally operates;
and performing functional test on the control mechanism: and determining whether the basic functions of the devices of the control mechanism are intact or not and whether the operation requirements in the test are met or not.
11. The data processing method of the micro-channel heat exchanger flow distribution characteristic measurement device based on any one of claims 1 to 8, is characterized by comprising the following steps:
acquiring the flow of all areas on the section to be measured through a camera mechanism;
calculating the average flow of the section to be measured according to the average flow of all the areas;
calculating to obtain a flow distribution coefficient according to the flow of all areas on the section to be measured and the calculated average flow of the section to be measured;
by changing the test parameters, the flow distribution characteristic curve of the heat exchanger to be tested can be obtained.
12. The data processing method of claim 11, wherein the flow distribution coefficient for a heat exchanger configuration under test is calculated by:
in the formula (I), the compound is shown in the specification,LF（Re，μ) Is composed ofReAndμa lower flow distribution coefficient;
the average flow value of the section to be measured is obtained;q(i,j)is a small area(i,j)The size of the flow rate of (a) is,Rerepresenting the magnitude of fluid turbulence;μrepresenting the magnitude of the fluid viscosity; wherein the content of the first and second substances,Reandμrelated to the flow rate, temperature, pressure and kind of the working medium;Mthe number of small areas per row of discrete cross-sections to be measured,Nis the discrete number of lines of the cross section to be measured.
13. A computer arrangement comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, carries out the steps of the data processing method according to any of claims 11-12.
14. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the data processing method of any one of claims 11 to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310010722.4A CN115683688B (en) | 2023-01-05 | 2023-01-05 | Microchannel heat exchanger flow distribution characteristic measuring device, method, equipment and medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310010722.4A CN115683688B (en) | 2023-01-05 | 2023-01-05 | Microchannel heat exchanger flow distribution characteristic measuring device, method, equipment and medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115683688A true CN115683688A (en) | 2023-02-03 |
| CN115683688B CN115683688B (en) | 2023-04-07 |
Family
ID=85056925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310010722.4A Active CN115683688B (en) | 2023-01-05 | 2023-01-05 | Microchannel heat exchanger flow distribution characteristic measuring device, method, equipment and medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115683688B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115791243A (en) * | 2023-02-06 | 2023-03-14 | 中国核动力研究设计院 | Modular microchannel heat exchanger standardization experiment platform, method, equipment and medium |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101393103A (en) * | 2008-10-31 | 2009-03-25 | 中国科学院力学研究所 | Hydrate microscopic seepage experimental apparatus |
| JP2009264772A (en) * | 2008-04-22 | 2009-11-12 | Nikon Corp | Flow evaluation apparatus and flow evaluation method |
| CN102175423A (en) * | 2011-01-28 | 2011-09-07 | 上海理工大学 | Device and experimental method for visualization research on labyrinth channel in high pressure regulating valve |
| CN104214994A (en) * | 2014-09-06 | 2014-12-17 | 中山大学 | Micro-channel heat exchanger with visual collecting pipe and method thereof |
| CN104502240A (en) * | 2014-12-17 | 2015-04-08 | 中国科学院工程热物理研究所 | Liquid parameter measurement system |
| CN204731000U (en) * | 2015-06-24 | 2015-10-28 | 武汉工程大学 | A kind of heat interchanger flow field monitoring device based on PIV system |
| CN107389297A (en) * | 2017-06-14 | 2017-11-24 | 西安热工研究院有限公司 | A kind of printed circuit board (PCB) heat exchanger channel flow field visual device |
| CN108195419A (en) * | 2017-12-21 | 2018-06-22 | 中山大学 | A kind of system and method for more observation of novel fluid |
| CN108489747A (en) * | 2018-03-14 | 2018-09-04 | 中山大学 | A kind of microchannel two phase flow radiator test device |
| CN108492896A (en) * | 2018-03-22 | 2018-09-04 | 中国核动力研究设计院 | A kind of U-tube refluence characteristic visualization measurement experimental provision |
| CN109115273A (en) * | 2018-09-25 | 2019-01-01 | 哈尔滨工程大学 | A kind of visible velocity field and thermal field coupling measurement experimental system |
| CN109632573A (en) * | 2019-01-21 | 2019-04-16 | 北京航空航天大学 | One kind is for supercritical pressure fluid flowing heat transfer visual experimental apparatus under the conditions of uniform heat flux |
| WO2021036501A1 (en) * | 2019-08-29 | 2021-03-04 | 浙江大学 | Tracer particle spreading device for flat-plate boundary layer flow visualization experiment |
| CN113834628A (en) * | 2021-09-06 | 2021-12-24 | 西安电子科技大学 | Micro-channel mechanism for inducing two-phase flow |
| CN113899777A (en) * | 2021-09-06 | 2022-01-07 | 西安电子科技大学 | Micro-channel experiment system for inducing two-phase flow |
| CN114719912A (en) * | 2022-04-26 | 2022-07-08 | 中国科学院大学 | Experimental system and measuring method for simultaneous measurement of multiple physical fields |
-
2023
- 2023-01-05 CN CN202310010722.4A patent/CN115683688B/en active Active
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009264772A (en) * | 2008-04-22 | 2009-11-12 | Nikon Corp | Flow evaluation apparatus and flow evaluation method |
| CN101393103A (en) * | 2008-10-31 | 2009-03-25 | 中国科学院力学研究所 | Hydrate microscopic seepage experimental apparatus |
| CN102175423A (en) * | 2011-01-28 | 2011-09-07 | 上海理工大学 | Device and experimental method for visualization research on labyrinth channel in high pressure regulating valve |
| CN104214994A (en) * | 2014-09-06 | 2014-12-17 | 中山大学 | Micro-channel heat exchanger with visual collecting pipe and method thereof |
| CN104502240A (en) * | 2014-12-17 | 2015-04-08 | 中国科学院工程热物理研究所 | Liquid parameter measurement system |
| CN204731000U (en) * | 2015-06-24 | 2015-10-28 | 武汉工程大学 | A kind of heat interchanger flow field monitoring device based on PIV system |
| CN107389297A (en) * | 2017-06-14 | 2017-11-24 | 西安热工研究院有限公司 | A kind of printed circuit board (PCB) heat exchanger channel flow field visual device |
| CN108195419A (en) * | 2017-12-21 | 2018-06-22 | 中山大学 | A kind of system and method for more observation of novel fluid |
| CN108489747A (en) * | 2018-03-14 | 2018-09-04 | 中山大学 | A kind of microchannel two phase flow radiator test device |
| CN108492896A (en) * | 2018-03-22 | 2018-09-04 | 中国核动力研究设计院 | A kind of U-tube refluence characteristic visualization measurement experimental provision |
| CN109115273A (en) * | 2018-09-25 | 2019-01-01 | 哈尔滨工程大学 | A kind of visible velocity field and thermal field coupling measurement experimental system |
| CN109632573A (en) * | 2019-01-21 | 2019-04-16 | 北京航空航天大学 | One kind is for supercritical pressure fluid flowing heat transfer visual experimental apparatus under the conditions of uniform heat flux |
| WO2021036501A1 (en) * | 2019-08-29 | 2021-03-04 | 浙江大学 | Tracer particle spreading device for flat-plate boundary layer flow visualization experiment |
| CN113834628A (en) * | 2021-09-06 | 2021-12-24 | 西安电子科技大学 | Micro-channel mechanism for inducing two-phase flow |
| CN113899777A (en) * | 2021-09-06 | 2022-01-07 | 西安电子科技大学 | Micro-channel experiment system for inducing two-phase flow |
| CN114719912A (en) * | 2022-04-26 | 2022-07-08 | 中国科学院大学 | Experimental system and measuring method for simultaneous measurement of multiple physical fields |
Non-Patent Citations (4)
| Title |
|---|
| TAE HYEON KIM: "Visual observations of flow patterns in downward air-water two-phase flows in a vertical narrow rectangular channel" * |
| 王秋旺: "交错螺旋折流板管壳式换热器壳侧传热与阻力性能" * |
| 袁培;李丹;康浩杰;吕彦力;付云飞;: "微细平行流通道换热器流量均布性试验研究" * |
| 马爽: "矩形并联微通道中流量分配与流动沸腾传热特性实验研究" * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115791243A (en) * | 2023-02-06 | 2023-03-14 | 中国核动力研究设计院 | Modular microchannel heat exchanger standardization experiment platform, method, equipment and medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115683688B (en) | 2023-04-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN115683688B (en) | Microchannel heat exchanger flow distribution characteristic measuring device, method, equipment and medium | |
| Vuong et al. | Shock formation within sonoluminescence bubbles | |
| Erdem et al. | Numerical investigation of heat transfer and flow characteristics of MHD nano-fluid forced convection in a pipe | |
| CN111814351A (en) | Preparation method and system of supercritical pressure fluid heat exchanger | |
| Eckert et al. | Local laminar heat transfer in wedge-shaped passages | |
| Colangelo et al. | A critical review of experimental investigations about convective heat transfer characteristics of nanofluids under turbulent and laminar regimes with a focus on the experimental setup | |
| Sasmal | Effects of axis ratio, nanoparticle volume fraction and its size on the momentum and heat transfer phenomena from an elliptic cylinder in water-based CuO nanofluids | |
| Hersant et al. | Turbulence in circumstellar disks | |
| Ozalp et al. | PIV measurements of flow through a sudden contraction | |
| Sun et al. | Study on the Convective Heat Transfer and Fluid Flow of Mini-Channel with High Aspect Ratio of Neutron Production Target | |
| Prakash et al. | Free convective MHD flow past a vertical cone with variable heat and mass flux | |
| Targett et al. | Flow through curved rectangular channels of large aspect ratio | |
| CN115791243A (en) | Modular microchannel heat exchanger standardization experiment platform, method, equipment and medium | |
| Revathi et al. | Dynamics of stagnant Sutterby fluid due to mixed convection with an emphasis on thermal analysis | |
| Mehta et al. | Effect of periodic pulsations on heat transfer in simultaneously developing laminar flows: a numerical study | |
| Collins et al. | Effects of temperature-dependence of viscosity and viscous dissipation on laminar flow heat transfer in circular tubes | |
| Peszyński et al. | Experimental verification of velocity distribution in different cross-sectional ventilation ducts | |
| CN115791244B (en) | Modular microchannel compact heat exchange experiment body, method, equipment and medium | |
| Gouse et al. | Numerical study of free convective MHD flow past a vertical cone in non-Darcian porous media | |
| Chegini et al. | An experimental and analytical investigation of friction factors for fully developed flow in internally finned triangular ducts | |
| Mahanta et al. | Collapsed dimension method applied to radiative transfer problems in complex enclosures with participating medium | |
| Youssef et al. | Artificial Neural Network Turbulent Modeling for Predicting the Pressure Drop of Nanofluid | |
| Febres et al. | Three-dimensional unit slug in a horizontal pipeline | |
| Mohiddin et al. | Numerical study of free convection flow past a vertical cone with variable heat and mass flux | |
| Awwad et al. | Error Estimation through Computational Analysis of the Fluid Flow over Expanding Cylinder with Gyrotactic Microbe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |