CN111397932A - Heat exchanger multi-field synchronous measurement system and method - Google Patents
Heat exchanger multi-field synchronous measurement system and method Download PDFInfo
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- CN111397932A CN111397932A CN202010212892.7A CN202010212892A CN111397932A CN 111397932 A CN111397932 A CN 111397932A CN 202010212892 A CN202010212892 A CN 202010212892A CN 111397932 A CN111397932 A CN 111397932A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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- G01M99/002—Thermal testing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
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Abstract
The invention discloses a heat exchanger multi-field synchronous measurement system and a method, the system comprises a circulating water tunnel experiment platform, a temperature change image speed measurement subsystem and a pressure measurement subsystem, wherein the circulating water tunnel experiment platform comprises a heat exchanger, a water tank, a submersible pump, an electromagnetic flowmeter and a frequency converter, the temperature change image speed measurement subsystem comprises a thermocouple, a heat source and a P L C controller, the pressure measurement subsystem comprises a pressure sensor, the heat exchanger comprises a heat exchanger body and a base detachably connected with the heat exchanger body, a microstructure is arranged on the base, and the thermocouple and the heat source are fixed on the base.
Description
Technical Field
The invention relates to the technical field of micro water circulation water conservancy and energy-saving engineering, in particular to a multi-field synchronous measurement system and method for a heat exchanger.
Background
Since the energy crisis outbreak since the seventies of the last century, environmental and socioeconomic problems centered on energy have been increasingly aggravated, countries in the world have fully recognized the significance of energy conservation, and the efficiency of energy utilization has become a core problem of development. In order to improve the utilization efficiency of energy and relieve the situation of energy shortage, all countries in the world actively explore new ways for energy conservation. For example, how to efficiently recover a large amount of waste heat in the industrial production processes of chemical industry, petroleum and the like and make full use of the waste heat is researched, and the heat exchanger with the most economical life cycle cost and the highest efficiency can be developed for small compact air conditioners and the like.
The heat exchanger is important equipment in a thermal process and is widely applied to industries such as chemical industry, petroleum, refrigeration, metallurgy, energy, power, medicine and the like. According to statistics, in a thermal power plant, the investment of a heat exchanger accounts for more than 60% of the total investment of the whole power plant; in general petrochemical enterprises, the heat exchanger accounts for 40-50% of the total investment; in the refrigerating machine, the mass of the evaporator accounts for 30-40% of the total mass of the refrigerating machine, and the aerodynamic consumption accounts for about 20-30% of the total value. Therefore, from the viewpoint of energy saving, materials, low investment and operation cost, and sustainable development, it is necessary to develop heat exchangers with various drag reduction microstructures having high heat exchange efficiency and small fluid resistance.
The invention discloses a method for manufacturing a mould with a shark skin or lotus leaf microstructure, which is characterized in that a plurality of bionic results are used for reference at home and abroad, the structure, heat transfer and fluidics rules are researched, the maximum energy saving is realized, a plurality of anti-drag and energy-saving microstructure products are invented, and the mould with the surface similar to the inner surface of the shark skin or lotus leaf microstructure is developed based on various advanced manufacturing means. In order to test the resistance reduction or heat transfer effect of the structures, a large number of fluid test experiments are required, and the fluid experiments are usually completed in a water tunnel or a wind tunnel.
The method for measuring the fluid flow characteristics of the microstructure by adopting the water tunnel or the wind tunnel is a conventional method, but the price for building a whole set of large water tunnel or wind tunnel is very expensive, and meanwhile, a sample tested in the water tunnel or the wind tunnel must meet the size requirements of certain length and width, otherwise, a stable boundary layer cannot be formed, so that the influence of the tested sample on the fluid flow cannot be measured.
Disclosure of Invention
The invention mainly aims to provide a heat exchanger multi-field synchronous measurement system and method, and aims to achieve the purpose of testing the heat transfer resistance reduction effect of a heat exchanger by building a small circulating water tunnel experiment platform and reducing the manufacturing and testing cost.
In order to achieve the aim, the invention provides a heat exchanger multi-field synchronous measurement system, which comprises a circulating water tunnel experiment platform, a temperature change image speed measurement subsystem and a pressure measurement subsystem, wherein the circulating water tunnel experiment platform is connected with the temperature change image speed measurement subsystem;
the circulating water tunnel experiment platform comprises a heat exchanger, a water tank, a submersible pump, an electromagnetic flowmeter and a frequency converter, the temperature change image speed measurement subsystem comprises a thermocouple, a heat source and a P L C controller, and the pressure measurement subsystem comprises a pressure sensor;
the heat exchanger comprises a heat exchanger body and a base detachably connected with the heat exchanger body, the heat exchanger body and the base are sealed to form a heat exchange cavity, a microstructure is arranged on the base, and the thermocouple and the heat source are fixed on the base;
the immersible pump is located in the water tank, the immersible pump with the one end of heat exchanger body is connected, the other end of heat exchanger body with the water tank is connected, electromagnetic flow meter, connect gradually the other end of heat exchanger body with between the water tank, thermocouple, electromagnetic flow meter, converter respectively with P L C controller is connected, the converter still with the immersible pump is connected.
According to a further technical scheme, the heat exchanger further comprises a heat dissipation fan, and the heat dissipation fan is connected between the submersible pump and the heat exchanger body.
According to a further technical scheme, the heat exchanger further comprises a temperature sensor connected between the electromagnetic flowmeter and the other end of the heat exchanger body, and the temperature sensor is further connected with the P L C controller.
The invention further adopts the technical scheme that the system also comprises a display screen connected with the P L C controller.
According to a further technical scheme, one end and the other end of the heat exchanger body are in a gradually-flared or gradually-reduced opening shape.
In order to achieve the above object, the present invention further provides a heat exchanger multi-field synchronous measurement method, which is applied to the heat exchanger multi-field synchronous measurement system as described above, and the method includes the following steps:
heating the base of the heat exchanger through the heat source, starting the frequency converter and the submersible pump when the thermocouple detects that the temperature of the base rises to a stable value, enabling water to flow stably in the heat exchange cavity, and detecting the flow rate of the water through the electromagnetic flowmeter;
acquiring temperature data of the base by the thermocouple within a preset time according to a preset acquisition frequency, and synchronously acquiring pressure data between one end and the other end of the heat exchanger by the pressure sensor within the preset time according to the preset acquisition frequency;
when the temperature detected by the thermocouple does not drop any more and reaches a stable state, analyzing the thermocouple temperature data through the P L C controller to obtain the heat transfer coefficient of the base, and analyzing the pressure data synchronously acquired by the pressure sensor and the flow rate of the water detected by the electromagnetic flowmeter to obtain the drag reduction coefficient of the base.
A further technical solution of the present invention is that the step of analyzing the thermocouple temperature data by the P L C controller to obtain the heat transfer coefficient of the base includes:
the P L C controller obtains the slope of a temperature drop curve according to the thermocouple temperature data;
the P L C controller obtains the heat transfer coefficient of the base according to the slope of the temperature drop curve.
The further technical scheme of the invention is that the step of analyzing the pressure data synchronously acquired by the pressure sensor and the flow rate of the water detected by the electromagnetic flowmeter by the P L C controller to obtain the drag reduction coefficient of the base comprises the following steps:
the P L C controller obtains the current and voltage change values of the submersible pump, and the power value of the submersible pump is obtained through calculation according to the current and voltage change values;
and the P L C controller obtains the drag reduction coefficient of the base according to the pressure data synchronously acquired by the pressure sensor, the flow rate of the water detected by the electromagnetic flowmeter and the power value of the submersible pump.
A further technical solution of the present invention is that, before the step of heating the base of the heat exchanger by the heat source, the method further comprises:
and constructing the heat exchanger multi-field synchronous measurement system.
The heat exchanger multi-field synchronous measurement system and the method have the beneficial effects that:
1. according to the invention, by building the small-sized circulating water tunnel experiment platform, the cost for building the experiment platform can be greatly reduced, the water tunnel building is miniaturized, the measurement precision is improved, the operation is simple, and the site is not limited;
2. for a small water circulation system, the size of the sample to be measured can be greatly reduced, and although the resistance characteristic formed by the fluid flowing through the sample at one time is not obvious, the effect can be amplified continuously through circulation accumulation. Therefore, the size of the sample needing to be processed and prepared can be greatly reduced, so that the processing production cost and the testing cost are reduced.
3. According to the invention, the temperature change image speed measurement subsystem is built, so that not only can the resistance field of the fluid be measured, but also the temperature field can be measured, and the effect of multi-field measurement of one system is realized.
Drawings
FIG. 1 is a schematic structural diagram of a preferred embodiment of a multi-field synchronous measurement system of a heat exchanger according to the present invention;
FIG. 2 is a schematic flow chart of a preferred embodiment of the multi-field synchronous measurement method of the heat exchanger of the present invention.
The implementation, functional features and advantages of the present invention will be described with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Considering that the prior art usually adopts a water tunnel or a wind tunnel to measure the fluid flow characteristics of a microstructure, but the cost for building a whole set of large water tunnel or wind tunnel is very high, and a sample tested in the water tunnel or wind tunnel must also meet the size requirements of certain length and width, otherwise, a stable boundary layer cannot be formed, so that the influence of the tested sample on the fluid flow cannot be measured, and therefore, the invention provides a solution.
Specifically, the invention provides a micro-structure surface heat exchanger multi-field synchronous measurement system and method based on a small circulating water tunnel.
The technical scheme adopted by the invention is mainly as follows: the invention uses the latest bionics research result for reference, firstly adopts modeling and fluid simulation technology to design and predict the resistance-reducing and heat-transferring effects of the bionic shark skin structure. By means of ultra-precision machining, a template with a bionic complex microstructure is machined on the metal surface, a reasonable machining process and machining parameters are formulated to improve the cutting machining efficiency, and the drag reduction and high-efficiency heat exchanger equipment inner surface microstructure with high-precision surface quality and optimized morphological characteristics is obtained. In addition, the measurement and evaluation of the drag reduction characteristics and the heat transfer efficiency of the traditional sample with a functional structure and the heat exchange equipment are complex and expensive all the time, and the invention combines the characteristic experimental investigation of ultra-precision machining and creatively establishes a set of simple heat transfer and flow resistance detection method.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a preferred embodiment of a multi-field synchronous measurement system of a heat exchanger 1 according to the present invention.
As shown in fig. 1, in this embodiment, the multi-field synchronous measurement system of the heat exchanger 1 includes a circulating water tunnel experiment platform, a temperature change image speed measurement subsystem, and a pressure measurement subsystem.
The circulating water tunnel experiment platform comprises a heat exchanger 1, a water tank 2, a submersible pump 3, an electromagnetic flowmeter 4 and a frequency converter 5, the temperature change image speed measurement subsystem comprises a thermocouple 6, a heat source 7 and a P L C controller 8, and the pressure measurement subsystem comprises a pressure sensor 9.
The heat exchanger 1 comprises a heat exchanger body 101 and a base 102 detachably connected with the heat exchanger body 101, and the base 102 and the heat exchanger body 101 are detachably connected, so that the fluid action effect of different microstructure surfaces can be flexibly and conveniently monitored.
The heat exchanger body 101 and the base 102 are sealed to form a heat exchange cavity, the base 102 is provided with a microstructure, and the thermocouple 6 and the heat source 7 are fixed on the base 102.
In the embodiment, the heat source 7 is used for heating the base 102 of the heat exchanger 1, the frequency converter 5 and the submersible pump 3 are used for enabling water to stably flow in the heat exchange cavity when the thermocouple 6 detects that the temperature of the base 102 rises to a stable value, and the electromagnetic flowmeter 4 is used for detecting the flow rate of the water;
the thermocouple 6 is used for acquiring temperature data of the base 102 within a preset time period according to a preset acquisition frequency, and the pressure sensor 9 is used for synchronously acquiring pressure data between one end and the other end of the heat exchanger 1 within the preset time period according to the preset acquisition frequency.
The P L C controller 8 is used for analyzing the temperature data of the thermocouple 6 to obtain the heat transfer coefficient of the base 102 when the temperature detected by the thermocouple 6 does not drop any more and reaches a stable state, and analyzing the pressure data synchronously acquired by the pressure sensor 9 and the flow rate of the water detected by the electromagnetic flowmeter 4 to obtain the drag reduction coefficient of the base 102.
The P L C controller 8 is further configured to obtain a slope of a temperature decrease curve based on the thermocouple 6 temperature data, and to obtain a heat transfer coefficient of the base 102 based on the slope of the temperature decrease curve.
The P L C controller 8 is further configured to obtain a current and voltage variation value of the submersible pump 3, calculate a power value of the submersible pump 3 according to the current and voltage variation value, and obtain a drag reduction coefficient of the base 102 according to the pressure data synchronously acquired by the pressure sensor 9, the flow rate of the water detected by the electromagnetic flowmeter 4, and the power value of the submersible pump 3, wherein an ammeter for measuring the current of the submersible pump 3 may be disposed between the submersible pump 3 and the P L C controller 8.
It can be understood that, in this embodiment, the submersible pump 3 and one end of the heat exchanger body 101 and the water tank 2 and the other end of the heat exchanger body 101 may be connected by the PVC water pipe 10, and data signals acquired by the thermocouple 6, the electromagnetic flowmeter 4, and the pressure sensor 9 may be transmitted to the P L C controller 8 through the signal conditioner and the data acquisition card, and when the water pump switch is triggered, the data acquisition card is controlled to perform data acquisition at the same time, thereby implementing synchronous observation and measurement of the microstructure surface flow field by various experimental measurement devices, and finally implementing comprehensive research on the complex flow phenomenon of multi-field coupling, i.e., flow field resistance and heat transfer.
Further, in this embodiment, the multi-field synchronous measurement system of the heat exchanger 1 further includes a heat dissipation fan, the heat dissipation fan is connected between the submersible pump 3 and the heat exchanger body 101, and the heat dissipation fan can be installed on the PVC water pipe 10 to dissipate heat from the PVC water pipe 10, so as to keep the water temperature in the water temperature water pipe 10 constant.
Further, in the present embodiment, the heat exchanger 1 multi-field synchronous measurement system further includes a temperature sensor 11, the temperature sensor 11 is connected between the electromagnetic flow meter 4 and the other end of the heat exchanger body 101, the temperature sensor 11 is further connected with the P L C controller 8, and the temperature sensor 11 is used for detecting the temperature of the PVC water pipe 10.
Further, in this embodiment, the multi-field synchronous measurement system of the heat exchanger 1 further includes a display screen 12 connected to the P L C controller 8, so as to present the measurement result of the microstructure surface flow field to a user.
In addition, it is worth mentioning that in the present embodiment, one end and the other end of the heat exchanger body 101 are in a gradually flared or gradually tapered shape, so that the flow of water in the heat exchange cavity can be uniform and stable.
The heat exchanger multi-field synchronous measurement system has the beneficial effects that:
1. according to the invention, by building the small-sized circulating water tunnel experiment platform, the cost for building the experiment platform can be greatly reduced, the water tunnel building is miniaturized, the measurement precision is improved, the operation is simple, and the site is not limited;
2. for a small water circulation system, the size of the sample to be measured can be greatly reduced, and although the resistance characteristic formed by the fluid flowing through the sample at one time is not obvious, the effect can be amplified continuously through circulation accumulation. Therefore, the size of the sample needing to be processed and prepared can be greatly reduced, so that the processing production cost and the testing cost are reduced.
3. According to the invention, the temperature change image speed measurement subsystem is built, so that not only can the resistance field of the fluid be measured, but also the temperature field can be measured, and the effect of multi-field measurement of one system is realized.
In order to achieve the above purpose, based on the heat exchanger multi-field synchronous measurement system shown in fig. 1, the present invention further provides a heat exchanger multi-field synchronous measurement method, which is applied to the heat exchanger multi-field synchronous measurement system according to the above embodiment.
As shown in fig. 2, fig. 2 is a schematic flow chart of a preferred embodiment of the heat exchanger multi-field synchronous measurement method of the present invention.
Referring to fig. 2, in the present embodiment, the method for multi-field synchronous measurement of a heat exchanger includes the following steps:
and step S10, heating the base of the heat exchanger through a heat source, starting a frequency converter and a submersible pump when the thermocouple detects that the temperature of the base rises to a stable value, enabling water to flow stably in the heat exchange cavity, and detecting the flow rate of the water through an electromagnetic flowmeter.
And step S20, acquiring temperature data of the base by the thermocouple within a preset time length according to a preset acquisition frequency, and synchronously acquiring pressure data between one end and the other end of the heat exchanger by the pressure sensor within the preset time length according to the preset acquisition frequency.
And step S30, when the temperature detected by the thermocouple does not drop any more and reaches a stable state, obtaining the heat transfer coefficient of the base by the P L C controller according to the thermocouple temperature data, and analyzing the pressure data synchronously acquired by the pressure sensor and the flow rate of the water detected by the electromagnetic flowmeter to obtain the drag reduction coefficient of the base.
Further, in this embodiment, the step of analyzing the thermocouple temperature data by the P L C controller to obtain the heat transfer coefficient of the base includes:
the P L C controller obtains the slope of the temperature drop curve according to the thermocouple temperature data;
the P L C controller obtains the heat transfer coefficient of the base according to the slope of the temperature drop curve.
Further, in this embodiment, the step of analyzing, by the P L C controller, the pressure data synchronously acquired by the pressure sensor and the flow rate of the water detected by the electromagnetic flowmeter to obtain the drag reduction coefficient of the base includes:
the P L C controller obtains the current and voltage change values of the submersible pump, and the power value of the submersible pump is obtained through calculation according to the current and voltage change values;
and the P L C controller obtains the drag reduction coefficient of the base according to the pressure data synchronously acquired by the pressure sensor, the flow rate of the water detected by the electromagnetic flowmeter and the power value of the submersible pump.
Further, in this embodiment, the step of heating the base of the heat exchanger by the heat source further includes:
and (4) constructing a multi-field synchronous measuring system of the heat exchanger.
The working flow of the multi-field synchronous measurement method of the heat exchanger of the invention is further explained below.
The method comprises the steps of firstly, turning on a heat source to heat a base of a heat exchanger, simultaneously, detecting the temperature of the base by a thermocouple sensor, starting a submersible pump when the temperature rises to a stable value, adjusting flow parameters to enable water to flow stably in a heat exchange cavity, then respectively starting a temperature image speed measuring subsystem and a pressure measuring subsystem, respectively setting acquisition frequency and acquisition time length of the temperature image speed measuring subsystem and the pressure measuring subsystem, then enabling the temperature image speed measuring subsystem and the pressure measuring subsystem to be in a waiting triggering state, finally, when the temperature detected by the thermocouple does not fall any more and reaches the stable state, analyzing multi-field synchronous acquisition data by a P L C controller, and finishing the experiment after the steps are finished.
It will be appreciated that the effect on the fluid flow regime of the structured surface is necessarily different for different microstructures. The specific way for analyzing the multi-field synchronous acquisition data is as follows:
1. for analysis of the temperature field, this data is derived from data collected by the thermocouple. When the base with the microstructure is heated to a certain temperature by the heat source, a water pump switch of the submersible pump is turned on, circulating water starts to flow on the surface of the microstructure of the base, the temperature of the base continuously drops along with the circulating water, and finally a stable value is reached. For different microstructures, the slope of the curve of temperature drop is different due to different heat transfer effects, and the corresponding stable temperature values are different after the temperature is not dropped any more. Analyzing the descending rules of different temperature curves is an important basis for judging the heat transfer performance.
2. For the analysis of the flow resistance field, the data is obtained from the data collected by an energy measuring instrument (measuring the voltage and current changes of the water pump), a pressure sensor and an electromagnetic flowmeter. The different microstructures differ in drag reduction properties of the fluid. There are two experimental test methods for the analysis of the flow resistance field in this example: firstly, keeping the same fluid flow speed, replacing different microstructure bases, and collecting pressure change data (measured by a pressure sensor) at two ends of a heat exchanger body; and secondly, keeping the pressure difference between the two sides of the heat exchanger body unchanged, and replacing the microstructure base to collect data (measured by the electromagnetic flowmeter) of the flow velocity change. And then, the laboratory is made, the current and voltage change values of the water pump are collected at the same time, and the power value is calculated through a formula. Through the change of the pressure difference, the change of the flow velocity is matched with the change of the power of the water pump, and the micro-structure surface with better drag reduction effect can be analyzed.
The heat exchanger multi-field synchronous measurement method has the beneficial effects that:
1. according to the invention, by building the small-sized circulating water tunnel experiment platform, the cost for building the experiment platform can be greatly reduced, the water tunnel building is miniaturized, the measurement precision is improved, the operation is simple, and the site is not limited;
2. for a small water circulation system, the size of the sample to be measured can be greatly reduced, and although the resistance characteristic formed by the fluid flowing through the sample at one time is not obvious, the effect can be amplified continuously through circulation accumulation. Therefore, the size of the sample needing to be processed and prepared can be greatly reduced, so that the processing production cost and the testing cost are reduced.
3. According to the invention, the temperature change image speed measurement subsystem is built, so that not only can the resistance field of the fluid be measured, but also the temperature field can be measured, and the effect of multi-field measurement of one system is realized.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A heat exchanger multi-field synchronous measurement system is characterized by comprising a circulating water tunnel experiment platform, a temperature change image speed measurement subsystem and a pressure measurement subsystem;
the circulating water tunnel experiment platform comprises a heat exchanger, a water tank, a submersible pump, an electromagnetic flowmeter and a frequency converter, the temperature change image speed measurement subsystem comprises a thermocouple, a heat source and a P L C controller, and the pressure measurement subsystem comprises a pressure sensor;
the heat exchanger comprises a heat exchanger body and a base detachably connected with the heat exchanger body, the heat exchanger body and the base are sealed to form a heat exchange cavity, a microstructure is arranged on the base, and the thermocouple and the heat source are fixed on the base;
the immersible pump is located in the water tank, the immersible pump with the one end of heat exchanger body is connected, the other end of heat exchanger body with the water tank is connected, electromagnetic flow meter, connect gradually the other end of heat exchanger body with between the water tank, thermocouple, electromagnetic flow meter, converter respectively with P L C controller is connected, the converter still with the immersible pump is connected.
2. The heat exchanger multi-field synchronous measurement system according to claim 1, further comprising a heat dissipation fan connected between the submersible pump and the heat exchanger body.
3. The heat exchanger multi-field synchronous measurement system according to claim 1, further comprising a temperature sensor connected between the electromagnetic flow meter and the other end of the heat exchanger body, the temperature sensor being further connected with the P L C controller.
4. The heat exchanger multi-field synchronous measurement system according to claim 1, further comprising a display screen connected with the P L C controller.
5. The heat exchanger multi-field synchronous measurement system according to claim 1, wherein one end and the other end of the heat exchanger body are in a shape of a gradually flared opening or a gradually tapered opening.
6. A heat exchanger multi-field synchronous measurement method, which is applied to the heat exchanger multi-field synchronous measurement system according to any one of claims 1-5, and comprises the following steps:
heating the base of the heat exchanger through the heat source, starting the frequency converter and the submersible pump when the thermocouple detects that the temperature of the base rises to a stable value, enabling water to flow stably in the heat exchange cavity, and detecting the flow rate of the water through the electromagnetic flowmeter;
acquiring temperature data of the base by the thermocouple within a preset time according to a preset acquisition frequency, and synchronously acquiring pressure data between one end and the other end of the heat exchanger by the pressure sensor within the preset time according to the preset acquisition frequency;
when the temperature detected by the thermocouple does not drop any more and reaches a stable state, analyzing the thermocouple temperature data through the P L C controller to obtain the heat transfer coefficient of the base, and analyzing the pressure data synchronously acquired by the pressure sensor and the flow rate of the water detected by the electromagnetic flowmeter to obtain the drag reduction coefficient of the base.
7. The method for multi-field synchronous measurement of the heat exchanger according to claim 6, wherein the step of analyzing the thermocouple temperature data by the P L C controller to obtain the heat transfer coefficient of the base comprises:
the P L C controller obtains the slope of a temperature drop curve according to the thermocouple temperature data;
the P L C controller obtains the heat transfer coefficient of the base according to the slope of the temperature drop curve.
8. The heat exchanger multi-field synchronous measurement method according to claim 6, wherein the step of analyzing the pressure data synchronously acquired by the pressure sensor and the flow rate of the water detected by the electromagnetic flow meter by the P L C controller to obtain the drag reduction coefficient of the base comprises the steps of:
the P L C controller obtains the current and voltage change values of the submersible pump, and the power value of the submersible pump is obtained through calculation according to the current and voltage change values;
and the P L C controller obtains the drag reduction coefficient of the base according to the pressure data synchronously acquired by the pressure sensor, the flow rate of the water detected by the electromagnetic flowmeter and the power value of the submersible pump.
9. The heat exchanger multi-field synchronous measurement method according to any one of claims 6 to 8, wherein the step of heating the base of the heat exchanger by the heat source further comprises:
and constructing the heat exchanger multi-field synchronous measurement system.
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| CN101545843A (en) * | 2009-04-16 | 2009-09-30 | 西安交通大学 | Drag-reduction property experimental apparatus for surfactant solution |
| CN103091362A (en) * | 2013-01-25 | 2013-05-08 | 上海交通大学 | Novel opened type heat conduction coefficient testing device |
| CN103616404A (en) * | 2013-11-05 | 2014-03-05 | 西安交通大学 | Fluid flow heat-exchanging experimental device with ball socket/ball bulge flow control structure |
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