CN104697739B - Cryogen flow resistance and Temperature Distribution test device in adiabatic corrugated tube - Google Patents
Cryogen flow resistance and Temperature Distribution test device in adiabatic corrugated tube Download PDFInfo
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Abstract
The present invention relates to cryogen flow resistance and Temperature Distribution test device in a kind of adiabatic corrugated tube, the test device includes the low temperature being connected by metal hose from pressurized tanks, two-stage subcooler, corrugated tube experimental section, carburator and gas flowmeter, corrugated tube experimental section is connected with charge and exhaust pipe road, vacuum in corrugated tube experimental section is adjusted by charge and exhaust pipe road, temperature and pressure measuring unit and vacuum measurement unit is provided with corrugated tube experimental section, by temperature in corrugated tube experimental section, pressure obtains cryogen flow resistance and Temperature Distribution in adiabatic corrugated tube with vacuum degrees of data.Compared with prior art, apparatus of the present invention simple structure, easy to operate, safe and reliable, it is adaptable to the flowing and heat-transfer character experiment measurement under different angle in multiple cryogen thermal insulation corrugated tubes.
Description
Technical field
The present invention relates to cryogen flowing and heat-transfer character experiment test device, more particularly, to a kind of adiabatic corrugated tube
Interior cryogen flow resistance and Temperature Distribution test device, belong to cryogenic engineering and cryogenic technique field.
Background technology
Cryogen flowing with heat-transfer character be energy development, chemical industry metallurgical, environmental conservation, health care, transportation,
The fundamental property of the field such as space technology extensive concern, product newly developed are generally required for the actual measurement for carrying out correlation.Especially
Which is during hyperconductive cable transmission of electricity, the production of liquefied natural gas and Liquid Hydrogen fuel storage and transporting etc., is broadly directed to
The flow behavior measurement of the fluid devices such as all kinds of pipelines, valve, reducing.The conveying of cryogen and the circulation as cooling medium
Vacuum heat-insulated pipe is all be unable to do without, and wherein flexible bellow occupies significant proportion in this kind of vacuum heat-insulating pipe.A kind of letter of design
Single reliable device can be realized being suitable for flowing of multiple cryogens under specified conditions in corrugated tube and heat-transfer character standard
Change measurement and there is important value.
It is special with pressure drop that the patent of Publication No. CN102435632A discloses a kind of cryogen characteristics of flow boiling heat transfer
Property pilot system, the system installs electric heating equipment in the vacuum dewar, mainly for cryogen stream in heat exchanger tube
Dynamic this specified conditions of boiling are carried out heat transfer and are studied with drooping characteristic；Its only heat exchanger pipeline carries out temperature survey,
Pipeline cannot be realized along journey temperature survey.Additionally, its subcooler cannot realize the fluid precooling of below 77K warm areas.Journal article
" experimentation of flow behavior in corrugated tube " (Engineering Thermophysics journal, 2008,10:A kind of survey is disclosed in 1725-1727)
The experimental provision of amount liquid nitrogen flow resistance in the corrugated tube, is provided with the fluid voltage stabilization and current stabilization that manostat causes to enter corrugated tube, tool
There is certain advantage.But the device is not easy to the corrugated tube sample for replacing different size, it is impossible to changes angle of inclination, does not have
Measuring bellow is along journey Temperature Distribution, the performance measurement in the case of not having change vacuums leakage different with detection hot etc..
Content of the invention
The purpose of the present invention is exactly to provide in a kind of adiabatic corrugated tube to overcome the defect of above-mentioned prior art presence
Cryogen flow resistance and Temperature Distribution test device, the device are suitable for flow resistance in multiple cryogen thermal insulation corrugated tubes
Test with Temperature Distribution, device is simple, safe and reliable, can achieve multiple under the conditions of experiment measurement, can conveniently replace detected sample
QC road sample, not only provides drooping characteristic under different leakage heat conditions, and the Temperature Distribution of synchronous experiments section, more important
Be the measurement function of achieving tested pipeline under different angle.
The purpose of the present invention can be achieved through the following technical solutions：
Cryogen flow resistance and Temperature Distribution test device in a kind of adiabatic corrugated tube, the test device include passing through
The low temperature that metal hose is connected from pressurized tanks, two-stage subcooler, corrugated tube experimental section, carburator and gas flowmeter,
Described corrugated tube experimental section includes inner corrugated pipe, outward corrugated tube, major diameter operating cavity and internal filling core body, institute
The outward corrugated tube that states is set in outside inner corrugated pipe, and described inside filling core body is seated at inner corrugated pipe die, described
Major diameter operating cavity is located at the two ends of outward corrugated tube, wherein, the two ends of described inner corrugated pipe and the metal of transporting low temperature fluid
Soft pipe connection,
Vacuum insulation cavity, the vacuum insulation cavity and charge and exhaust pipe road phase is formed between inner corrugated pipe and outward corrugated tube
Connection, adjusts vacuum in vacuum insulation cavity by charge and exhaust pipe road,
Temperature and pressure measuring unit and vacuum measurement unit are provided with described corrugated tube experimental section, are passed through
In corrugated tube experimental section, temperature, pressure and vacuum degrees of data obtain cryogen flow resistance and temperature point in adiabatic corrugated tube
Cloth.
Pressure-regulating valve, flow control valve, back pressure regulating valve and switch valve is provided with metal hose, and described pressure is adjusted
Section valve is located at low temperature between pressurized tanks and two-stage subcooler, and described flow control valve is located at two-stage subcooler and corrugated tube
Between experimental section, described back pressure regulating valve is located between corrugated tube experimental section and carburator, and described switch valve is located at vaporization
Between device and gas flowmeter.
Described two-stage subcooler is divided into first order subcooler and second level subcooler, and first order subcooler is by first order disk
Pipe is placed in open insulation stainless cylinder of steel and constitutes；Second level subcooler by closed wide-mouth Dewar, be placed in wide-mouth Dewar
Secondary coil, and constitute with the mechanical pump connected inside wide-mouth Dewar, described first order coil pipe is suitable with second level coil pipe
Sequence is connected on metal hose.The cryogen of supercooled state is obtained according to two-stage subcooler, and wherein first order subcooler exists
Most heat exchange is completed under normal pressure, and second level subcooler can realize further supercool changing under conditions of evacuation
Heat.
Described inside filling core body is inserted into thing for simulating inner corrugated pipe, and core body is filled by poly- four in described inside
Fluorothene spiral support structure is fixed on inner corrugated pipe die, both heatproof, and entrance flow resistance is minimum again, more convenient for dismounting is replaced
Change.
Described major diameter operating cavity is connected with outward corrugated tube by clip so that with interior ripple inside major diameter operating cavity
The vacuum insulation cavity formed between pipe and outward corrugated tube is connected, and the two ends of described inner corrugated pipe operate intracavity with major diameter
Connecting tube connected by ferrule fitting, the connecting tube of major diameter operation intracavity connect with metal hose, inner corrugated pipe with outward
Filling multilayer adiabator in the vacuum insulation cavity formed between corrugated tube.Achievable interior by opening the major diameter operating cavity
The cutting ferrule attended operation of corrugated tube, flexibly to dismount and change tested corrugated tube and tube core sample, so that realize tested ripple
The different size of pipe and tube core sample replaces experiment.
Described charge and exhaust pipe road is connected with inside major diameter operating cavity, be provided with charge and exhaust pipe road vacuum pump with true
Empty valve, and inflation stop valve is set on charge and exhaust pipe road.
Described temperature and pressure measuring unit includes differential pressure transmitter, bottom temp sensor and head temperature sensing
Device, the described two ends of differential pressure transmitter are connected with the two ends of inner corrugated pipe, and minute-pressure difference measurements realized by described differential pressure transmitter,
Described bottom temp sensor is at equal intervals uniformly installed in the bottom outer surface of the vertical direction of inner corrugated pipe, described top
Temperature sensor is at equal intervals uniformly installed in the outer surface of cupular part of the vertical direction of inner corrugated pipe；
Described vacuum measurement unit includes and the vacuum gauge and digital display vacuometer being connected inside major diameter operating cavity, leads to
The vacuum that vacuum gauge and digital display vacuometer obtain the vacuum insulation cavity formed between inner corrugated pipe and outward corrugated tube is crossed, is passed through
Change vacuum change corrugated tube adiabatic condition, the different degrees of gas leakage operating mode of the cryogenic pipe that simulation is run throughout the year can be used for
Flowing and the heat-transfer character in corrugated tube is tested under the different vacuums of monitoring.
Described differential pressure transmitter, bottom temp sensor and tip temperature sensor are connected with data collecting card, should
Data collecting card is connected with computer, and computer is according to by differential pressure transmitter, bottom temp sensor and tip temperature sensor
The temperature of acquisition, pressure data, obtain cryogen flow resistance and Temperature Distribution in adiabatic corrugated tube.
Described corrugated tube experimental section is placed on support pedestal, and described support pedestal is two-part liftable support,
Including base, intermediate stretchable support and stretchable hinge, described intermediate stretchable is erected at the middle part of base, described
Stretchable hinge is provided with two, and its one end is connected to the left or right of base, the other end simultaneously with intermediate stretchable support
Top is hinged；Realize supporting the deformation of pedestal bent angle by the angle for adjusting stretchable hinge, for adiabatic ripple under different angle
Cryogen flow resistance and Temperature Distribution test in pipe.
Compared with prior art, apparatus of the present invention are suitable for flow resistance and temperature point in multiple cryogen thermal insulation corrugated tubes
Cloth is tested, and device is simple, safe and reliable, can achieve multiple under the conditions of experiment measurement, can conveniently replace sample pipeline sample
Product, not only provide drooping characteristic under different leakage heat conditions, and the Temperature Distribution of synchronous experiments section by apparatus of the present invention,
Tested pipeline measurement function under different angle is more importantly achieved.
Description of the drawings
Fig. 1 is the structural representation of test device of the present invention；
Fig. 2 is the partial enlarged drawing of test device corrugated tube experimental section of the present invention；
Fig. 3 is the jacking condition schematic diagram that test device of the present invention supports pedestal.
Label in figure：1 be low temperature from pressurized tanks, 2 is pressure-regulating valve, and 3 is stainless cylinder of steel, and 4 is first order coil pipe, 5
For wide-mouth Dewar, 6 is second level coil pipe, and 7 is mechanical pump, and 8 is flow control valve, and 9 is major diameter operating cavity, and 10 connect for cutting ferrule
Head, 11 is inner corrugated pipe, and 12 is clip, and 13 is outward corrugated tube, and 14 is vacuum gauge, and 15 are internal filling core body, and 16 become for differential pressure
Device is sent, 17 is bottom temp sensor, and 18 is tip temperature sensor, and 19 is back pressure regulating valve, and 20 is carburator, and 21 are switch
Valve, 22 is gas flowmeter, and 23 are inflation stop valve, and 24 is vacuum valve, and 25 is vacuum pump, and 26 is data collecting card, and 27 are meter
Calculation machine, 28 is base, and 29 is intermediate stretchable support, and 30 is stretchable hinge.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
Cryogen flow resistance and Temperature Distribution test device in a kind of adiabatic corrugated tube, as shown in Figure 1 and Figure 2, the survey
Trial assembly is put including the low temperature being connected by metal hose from pressurized tanks 1, two-stage subcooler, corrugated tube experimental section, carburator
20 and gas flowmeter 22, pressure-regulating valve 2, flow control valve 8, back pressure regulating valve 19 and switch valve is provided with metal hose
21, pressure-regulating valve 2 is located at low temperature between pressurized tanks 1 and two-stage subcooler, flow control valve 8 be located at two-stage subcooler with
Between corrugated tube experimental section, back pressure regulating valve 19 is located between corrugated tube experimental section and carburator 20, and switch valve 21 is located at vaporization
Between device 20 and gas flowmeter 22.
Two-stage subcooler is divided into first order subcooler and second level subcooler, and first order subcooler is put by first order coil pipe 4
Constitute in open insulation stainless cylinder of steel 3；Second level subcooler by closed wide-mouth Dewar 5, be placed in wide-mouth Dewar 5 second
Level coil pipe 6, and constitute with the mechanical pump 7 connected inside wide-mouth Dewar 5, first order coil pipe 4 is gone here and there with 6 order of second level coil pipe
It is associated on metal hose.The cryogen of supercooled state is obtained according to two-stage subcooler, and wherein first order subcooler is in normal pressure
Under complete most heat exchange, second level subcooler is under conditions of evacuation using the corresponding unique saturation of saturated vapor pressure
The principle of temperature can realize further supercool heat exchange.
Wherein, corrugated tube experimental section includes inner corrugated pipe 11, outward corrugated tube 13, major diameter operating cavity 9 and internal filled core
Body 15, outward corrugated tube 13 are set in outside inner corrugated pipe 11, and internal filling core body 15 is inserted into thing for simulating inner corrugated pipe 11,
Internal filling core body 15 is fixed on 11 die of inner corrugated pipe by politef spiral support structure, and both heatproof, entered to become a mandarin again
Dynamic resistance is minimum, more convenient for dismounting is replaced.Major diameter operating cavity 9 is located at the two ends of outward corrugated tube 13, and major diameter operating cavity 9 is led to
Cross clip 12 to be connected with outward corrugated tube 13 so that inside major diameter operating cavity 9 and inner corrugated pipe 11 and outward corrugated tube 13 between shape
Into vacuum insulation cavity be connected, the connecting tube in the two ends of inner corrugated pipe 11 and major diameter operating cavity 9 passes through ferrule fitting
10 connections, the connecting tube in major diameter operating cavity 9 are connected with metal hose, are formed between inner corrugated pipe 11 and outward corrugated tube 13
Vacuum insulation cavity in filling multilayer adiabator.The card of inner corrugated pipe 11 is can achieve by opening the major diameter operating cavity 9
Set attended operation, flexibly to dismount and change tested corrugated tube and tube core sample, so that realize tested corrugated tube and tube core sample
The different size of product replaces experiment.
Vacuum insulation cavity, the vacuum insulation cavity and charge and exhaust pipe is formed between inner corrugated pipe 11 and outward corrugated tube 13
Road is connected, and adjusts vacuum in vacuum insulation cavity by charge and exhaust pipe road, inside charge and exhaust pipe road and major diameter operating cavity 9
Be connected, vacuum pump 25 and vacuum valve 24 is provided with charge and exhaust pipe road, and inflation stop valve 23 is set on charge and exhaust pipe road.
Temperature and pressure measuring unit and vacuum measurement unit, temperature and pressure is provided with corrugated tube experimental section
Measuring unit includes differential pressure transmitter 16, bottom temp sensor 17 and tip temperature sensor 18, the two of differential pressure transmitter 16
End is connected with the two ends of inner corrugated pipe 11, and minute-pressure difference measurements realized by differential pressure transmitter 16, and bottom temp sensor 17 is equal at equal intervals
The bottom outer surface of the even vertical direction installed in inner corrugated pipe 11, tip temperature sensor 18 are uniformly arranged on interior ripple at equal intervals
The outer surface of cupular part of the vertical direction of stricture of vagina pipe 11；
Vacuum measurement unit includes and the vacuum gauge 14 and digital display vacuometer being connected inside major diameter operating cavity 9, passes through
Vacuum gauge 14 and digital display vacuometer obtain the vacuum of the vacuum insulation cavity formed between inner corrugated pipe 11 and outward corrugated tube 13,
Corrugated tube adiabatic condition is changed by changing vacuum, different degrees of gas leakage operating mode is simulated, be can be used to monitor different vacuums
Flowing and heat-transfer character in lower test corrugated tube.
Differential pressure transmitter 16, bottom temp sensor 17 and tip temperature sensor 18 are connected with data collecting card 26,
The data collecting card 26 is connected with computer 27, and computer 27 is according to by differential pressure transmitter 16, bottom temp sensor 17 and top
The temperature of the acquisition of portion's temperature sensor 18, pressure data, obtain cryogen flow resistance and Temperature Distribution in adiabatic corrugated tube.
In the present embodiment, corrugated tube experimental section is placed on support pedestal, supports pedestal as shown in figure 3, can rise for two-part
Descending branch frame, including base 28, intermediate stretchable support 29 and stretchable hinge 30, intermediate stretchable support 29 is located at base 28
Middle part, stretchable hinge 30 are provided with two, and its one end is connected to the left or right of base 28, and the other end can be stretched with centre simultaneously
The top of contracting support 29 is hinged；Realize supporting the deformation of pedestal bent angle by the angle for adjusting stretchable hinge 30, incline for difference
Cryogen flow resistance and Temperature Distribution test in adiabatic corrugated tube under angle.
The course of work of apparatus of the present invention is：
With liquid nitrogen as working media, first by low temperature from pressurized tanks 1 and two-stage subcooler, corrugated tube test section, vaporization
Device 20, gas flowmeter 22 pass sequentially through pressure-regulating valve 2, flow control valve 8, back pressure regulating valve 19, switch valve 21 and metal
Flexible pipe is connected.Corrugated tube experimental section is placed on support pedestal.
Evacuation is carried out to corrugated tube experimental section, process is：By vacuum pump 25 by vacuum valve 24 and corrugated tube experimental section
It is connected, closes inflation stop valve 23, open vacuum valve 24, by evacuation between interior outward corrugated tube, treats that vacuum reaches and steady
It is scheduled on 10-3Vacuum valve 24 is closed after Pa.
Pre-cooling is carried out to test device, specifically：A small amount of liquid is poured in open insulation stainless cylinder of steel 3 and wide-mouth Dewar 5
Nitrogen.Back pressure regulating valve 19 is opened, pressure-regulating valve 2 is opened, is treated that overpressure is increased to gauge pressure 0.1MPa, crack flow control valve
8, a small amount of liquid nitrogen is passed through from pressurized tanks 1 to corrugated tube experimental section from low temperature, and is directly emitted.
Formally tested：By liquid nitrogen full of open insulation stainless cylinder of steel 3 and wide-mouth Dewar 5, mechanical pump 7 is opened, to wide
Mouth 5 evacuation of Dewar.Pressure-regulating valve 2, back pressure regulating valve 19, switch valve 21 is opened, is controlled suitably by flow control valve 8
Liquid nitrogen flow continues through test device.
Differential pressure transmitter 16, bottom temp sensor 17,18 real-time survey of tip temperature sensor are recorded by computer 27
Examination data.The vacuum that cavity between 14 surveyed inner corrugated pipe of vacuum gauge and outward corrugated tube is recorded using digital display vacuometer.Arrange meter
The evidence that counts is obtained with cryogen flow resistance and Temperature Distribution in adiabatic corrugated tube.
The above-mentioned description to embodiment is to be understood that for ease of those skilled in the art and use invention.
Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein general
Principle is applied in other embodiment without through performing creative labour.Therefore, the invention is not restricted to above-described embodiment, ability
Announcement of the field technique personnel according to the present invention, the improvement that is made without departing from scope and modification all should be the present invention's
Within protection domain.
Claims (9)
1. cryogen flow resistance and Temperature Distribution test device in a kind of adiabatic corrugated tube, it is characterised in that test dress
Put including the low temperature being connected by metal hose from pressurized tanks (1), two-stage subcooler, corrugated tube experimental section, carburator
(20) and gas flowmeter (22),
Described corrugated tube experimental section includes inner corrugated pipe (11), outward corrugated tube (13), major diameter operating cavity (9) and internal filling
Core body (15), described outward corrugated tube (13) are set in inner corrugated pipe (11) outside, described inside filling core body (15) filling
At inner corrugated pipe (11) die, described major diameter operating cavity (9) is located at the two ends of outward corrugated tube (13), wherein, described
The two ends of inner corrugated pipe (11) are connected with the metal hose of transporting low temperature fluid,
Vacuum insulation cavity, the vacuum insulation cavity and charge and exhaust pipe is formed between inner corrugated pipe (11) and outward corrugated tube (13)
Road is connected, and adjusts vacuum in vacuum insulation cavity by charge and exhaust pipe road,
Temperature and pressure measuring unit and vacuum measurement unit are provided with described corrugated tube experimental section, by ripple
In pipe experimental section, temperature, pressure and vacuum degrees of data obtain cryogen flow resistance and Temperature Distribution in adiabatic corrugated tube.
2. cryogen flow resistance and Temperature Distribution test device in a kind of adiabatic corrugated tube according to claim 1,
Characterized in that, being provided with pressure-regulating valve (2), flow control valve (8), back pressure regulating valve (19) and switch valve on metal hose
(21), described pressure-regulating valve (2) is located at low temperature between pressurized tanks (1) and two-stage subcooler, described Flow-rate adjustment
Valve (8) is located between two-stage subcooler and corrugated tube experimental section, described back pressure regulating valve (19) be located at corrugated tube experimental section with
Between carburator (20), described switch valve (21) is located between carburator (20) and gas flowmeter (22).
3. cryogen flow resistance and Temperature Distribution test device in a kind of adiabatic corrugated tube according to claim 1,
Characterized in that, described two-stage subcooler is divided into first order subcooler and second level subcooler, first order subcooler is by first
Level coil pipe (4) is placed in open insulation stainless cylinder of steel (3) and constitutes；Second level subcooler by closed wide-mouth Dewar (5), be placed in wide
Second level coil pipe (6) in mouthful Dewar (5), and constituting with the mechanical pump (7) connect inside wide-mouth Dewar (5), described the
One-level coil pipe (4) is with second level coil pipe (6) sequential series on metal hose.
4. cryogen flow resistance and Temperature Distribution test device in a kind of adiabatic corrugated tube according to claim 1,
Characterized in that, described inside filling core body (15) is inserted into thing, described inside filling for simulating inner corrugated pipe (11)
Core body (15) is supported by politef and is fixed on inner corrugated pipe (11) die.
5. cryogen flow resistance and Temperature Distribution test device in a kind of adiabatic corrugated tube according to claim 1,
Characterized in that, described major diameter operating cavity (9) is connected with outward corrugated tube (13) by clip (12) so that major diameter is operated
Chamber (9) is internal to be connected with vacuum insulation cavity that is being formed between inner corrugated pipe (11) and outward corrugated tube (13), described interior ripple
The two ends of stricture of vagina pipe (11) are connected by ferrule fitting (10) with the connecting tube in major diameter operating cavity (9), major diameter operating cavity (9)
Interior connecting tube is connected with metal hose,
Filling multilayer adiabator in the vacuum insulation cavity formed between inner corrugated pipe (11) and outward corrugated tube (13).
6. cryogen flow resistance and Temperature Distribution test device in a kind of adiabatic corrugated tube according to claim 5,
Characterized in that, described charge and exhaust pipe road is connected with inside major diameter operating cavity (9), on charge and exhaust pipe road, it is provided with vacuum
Pump (25) and vacuum valve (24), and inflation stop valve (23) is set on charge and exhaust pipe road.
7. cryogen flow resistance and Temperature Distribution test device in a kind of adiabatic corrugated tube according to claim 1,
Characterized in that, described temperature and pressure measuring unit includes differential pressure transmitter (16), bottom temp sensor (17) and top
Portion's temperature sensor (18), the two ends of described differential pressure transmitter (16) are connected with the two ends of inner corrugated pipe (11), described bottom
Portion's temperature sensor (17) is at equal intervals uniformly installed in the bottom outer surface of the vertical direction of inner corrugated pipe (11), described top
Temperature sensor (18) is at equal intervals uniformly installed in the outer surface of cupular part of the vertical direction of inner corrugated pipe (11)；
Described vacuum measurement unit includes and the vacuum gauge (14) and digital display vacuum being connected inside major diameter operating cavity (9)
Meter, obtains the vacuum insulation formed between inner corrugated pipe (11) and outward corrugated tube (13) by vacuum gauge (14) and digital display vacuometer
The vacuum of cavity.
8. cryogen flow resistance and Temperature Distribution test device in a kind of adiabatic corrugated tube according to claim 7,
Characterized in that, described differential pressure transmitter (16), bottom temp sensor (17), tip temperature sensor (18) are and data
Capture card (26) connects, and the data collecting card (26) is connected with computer (27), and computer (27) is according to by differential pressure transmitter
(16) pressure that, bottom temp sensor (17) and tip temperature sensor (18) are obtained, temperature data, obtain adiabatic corrugated tube
Interior cryogen flow resistance and Temperature Distribution.
9. cryogen flow resistance and Temperature Distribution test device in a kind of adiabatic corrugated tube according to claim 1,
Characterized in that, described corrugated tube experimental section is placed on support pedestal, described support pedestal is two-part liftable
Frame, including base (28), intermediate stretchable support (29) and stretchable hinge (30), described intermediate stretchable support (29) sets
At the middle part of base (28), described stretchable hinge (30) is provided with two, and its one end is connected to the left end of base (28) or the right side
End, the other end are hinged with the top of intermediate stretchable support (29) simultaneously；Realized by the angle for adjusting stretchable hinge (30)
The deformation of pedestal bent angle is supported, for cryogen flow resistance in adiabatic corrugated tube under different angle and Temperature Distribution test.
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