CN109001249A - A kind of device for evaluating augmentation of heat transfer pipe in-tube condensation characteristic - Google Patents
A kind of device for evaluating augmentation of heat transfer pipe in-tube condensation characteristic Download PDFInfo
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Abstract
The present invention relates to a kind of devices for evaluating augmentation of heat transfer pipe in-tube condensation characteristic, mainly include vapour system, test section, cold water intake system and data collection system, the partial condensation heat transfer and drooping characteristic of various steam or gaseous mixture in different augmentation of heat transfer pipes can be evaluated.Vapour system includes boiler, forecooler, air compressor machine, air accumulator, drier, gas heater, static mixer, pure component, multi-component vapor or aeriferous gaseous mixture needed for can providing test.Test section includes that sequentially connected straight tube measuring section, condensation segment, measuring section and viewing section, entrance are connected with vapour system, and exit is connected with gas-liquid separator.The outer tube both ends of forecooler and test section a set of cold water also each in parallel but water set of system.The present invention can acquire the heat transfer coefficient in tubes of enhanced tube by thermal resistance partition method, and the thermal-design for efficient shell-and-tube cooler provides foundation.
Description
Technical field
The present invention relates to heat exchanger heat transfer element performance test fields, more particularly to a kind of evaluation augmentation of heat transfer pipe pipe
The device of interior condensing characteristic.
Background technique
Condenser can obtain higher heat transfer coefficient with lower heat transfer temperature difference, be the capital equipment of cooling system.Wherein
Shell-and-tube cooler since manufacture is easy, production cost is low, selection range is wide, easy to clean for it, and adapts to high temperature and pressure,
It is the most widely used condensing plant, is in leading position in the application of the industries such as petroleum, chemical industry and the energy.As the country passes through
The growth of Ji, the contradiction between social development and energy shortage becomes increasingly conspicuous, thus designs and manufactures efficient, compact heat exchange and set
It is standby, either from enterprise reduce investment improve Energy Efficiency Ratio angle, or from national energy conservation and emission reduction and push industrial energy saving angle
Degree, all has important realistic meaning.
Efficient shell-and-tube cooler mainly uses enhanced heat transfer component or improves heat exchanger structure, improves heat transfer efficiency,
To make investment and the lowest coursing cost of heat exchanger.Most importantly thermal-design when designing such condenser, i.e., according to work
Skill and physical data calculate the heat transfer area for meeting heat transfer and drop requirements, and then select suitable structure type and flowing
Arrangement.When Numerical heat transfer area, designer needs to use the Correlation farmula of heat transfer and pressure drop.At present for horizontal plain tube
Interior condensation, existing research person establish the heat transfer and pressure drop suitable for various use occasions on the basis of lot of experimental data
Correlation.But the Correlation farmula of all kinds of augmentation of heat transfer pipe in-tube condensations and pressure drop is also lacked, it is mixed especially for multicomponent
Close object even containing fixed gas there are the case where.It is therefore desirable to establish all kinds of augmentation of heat transfer pipe in-tube condensations of test and pressure drop
Device and method.
The device and method of traditional test condensation heat transfer are only capable of obtaining the average overall heat-transfer coefficient of entire condenser pipe mostly,
It obtains local heat transfer coefficient and then wants measurement pipe inner wall temperature.But the tube wall of augmentation of heat transfer pipe is based on heat conduction reinforced requirement,
Generally there are protrusion and grooves, this results in wall surface temperature to be different from the Two dimensional Distribution of smooth tube, is radially nonlinear Distribution.
Inner wall temperature can not be derived when test by Fourier Heat Conduction law, also can not just be obtained according to the temperature at thermocouple measuring point
To partial condensation heat transfer coefficient.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of device for evaluating augmentation of heat transfer pipe in-tube condensation characteristic, energy
Thermal-design enough for efficient shell-and-tube cooler provides basis.
The technical solution adopted by the present invention to solve the technical problems is: providing a kind of evaluation augmentation of heat transfer pipe in-tube condensation
The device of characteristic, including vapour system and test section, the entrance of the test section are connected with vapour system, exit and gas-liquid
Separator is connected, and the test section includes sequentially connected straight tube measuring section, condensation segment, measuring section and viewing section；The straight tube
Measuring section is provided with temperature, pressure and pressure difference instrument connection close to the inlet of condensation segment；The condensation segment includes the strong of coaxial arrangement
Change heat exchanger tube and outer tube, the housing pipe sleeve is at the outside of thermoexcell, the both ends of the thermoexcell and outer tube
It is fixed by the pressure plate with aperture；The measuring section is also provided with temperature, pressure and pressure difference close to the exit of condensation segment
Instrument connection；The viewing section is transparent pipeline, and the side of the transparent pipeline is provided with for differentiating in record thermoexcell
Flow pattern of gas-liquid two-phase flow high-speed camera；The both ends of the test section are also parallel with test section cooling water loop.
The vapour system includes boiler, forecooler, air compressor machine, air accumulator, drier, gas heater and static mixing
Device；The boiler, forecooler and static mixer are sequentially connected, the air compressor machine, air accumulator, drier and gas heater according to
Secondary to be connected, the outlet of the gas heater is also connected with static mixer；The forecooler be multisection type double-tube heat exchanger, two
End is parallel with precooling zone cooling water loop；When the forecooler is for changing test section inlet steam mass dryness fraction: xi=1-Qpre/hfg,
Wherein, hfgFor the steam latent heat of vaporization, QpreFor the heat output in forecooler, when carrying out gaseous mixture condensation experiment, forecooler is used for
Change the mass fraction of test section inlet air:WhereinFor volume of air flow, ρaFor
Atmospheric density,For steam mass flow.
The length of the straight tube measuring section is 25 times of enhanced heat exchange bore；Steam/gaseous mixture in the test section
In enhanced heat exchange in-tube condensation, cooling water forced convection heat transfer in the circular passage that inner and outer pipes are formed；By controlling cooling water
Flow and inlet temperature, so that the outlet mass dryness fraction of test section and the difference of import mass dryness fraction are less than 0.2, it is average in thermoexcell at this time
Heat transfer coefficient can be used as the partial condensation heat transfer coefficient under average mass dryness fraction, by measuring steam/gaseous mixture out temperature
With test section cooling water loop out temperature, partial condensation heat transfer coefficient: h is acquired according to thermal resistance partition methodc=do/[di·
(1/U-Rw-1/ho)], wherein U is overall heat-transfer coefficient, RwFor nominal wall resistance, ho is to manage outer convective heat-transfer coefficient, diAnd doPoint
It Wei not thermoexcell internal-and external diameter；The two phase flow friction pressure drop of condensation segment passes through
It calculates, wherein G is mass flux, and x is that steam is averaged mass dryness fraction, PiAnd PoRespectively test section inlet and outlet pressure, L are condensation segment length
Degree, ρlAnd ρvRespectively condensate liquid and vapour density, αvFor void fraction.
Gas-liquid separator is installed to be collected condensate liquid behind the test section, it is still uncooled by inhibiting pond to collect
Steam passes throughFlow value is checked, wherein mcFor the condensate quality of collection, Δ H is to inhibit pond
Liquid level increases height, and A is to inhibit pond sectional area, and t is experimental period, ρcFor condensate liquid density；When mixed vapour condenses, fixed gas
Mass content ω=(pt-ps)/[pt-(1-Ms/Mg)ps], wherein ptFor test section inlet pressure, psFor test section inlet temperature pair
The vapo(u)rous partial pressure answered, MsAnd MgThe respectively molecular weight of steam and fixed gas.
The test section cooling water loop includes the first water tank, the first magnetic drive pump, first flowmeter and the first accessory plate
Formula cooler, the import of the first auxiliary of connection panel cooler, first auxiliary are board-like at the test section cooling water outlet
The outlet of cooler is connected with the import of the first water tank, and the outlet of first water tank passes through the first magnetic drive pump and the survey
It tries to be connected at section cooling water inlet；It is provided with first flowmeter between first magnetic drive pump and cooling water inlet, described
Heating rod is provided in one water tank.
The precooling zone cooling water loop includes the second water tank, the second magnetic drive pump, second flowmeter and the second accessory plate
Formula cooler, the import of the second auxiliary of connection panel cooler, second auxiliary are board-like at the forecooler cooling water outlet
The outlet of cooler is connected with the import of the second water tank, the outlet of second water tank by the second magnetic drive pump with it is described pre-
It is connected at cooler cooling water inlet；It is provided with second flowmeter between second magnetic drive pump and cooling water inlet, described
Heating rod is provided in two water tanks.
Beneficial effect
Due to the adoption of the above technical solution, compared with prior art, the present invention having the following advantages that and actively imitating
Fruit:
The present invention obtains in-tube condensation local heat transfer coefficient using thermal resistance partition method, overcomes the prior art and needs in measurement
Wall temperature can just obtain the shortcomings that local heat transfer coefficient, evade enhanced tube wall surface temperature distributed in three dimensions bring thermometric problem.
The present invention can test condensation and drooping characteristic of the various steam in enhanced tube, and steam can be pure component, such as
Vapor, alcohol vapour etc. are also possible to multicomponent, such as alkane, azeotropic/mixed non-azeotropic refrigerant, or even can also survey
Examination contains operating condition of the air as fixed gas.
The present invention can recorde by importing and exporting installation quartz glass tube and exit placement high-speed camera in test section
Stream-liquid two-phase flow flow pattern under different quality flux and mass dryness fraction, to draw out the flow pattern of all kinds of augmentation of heat transfer pipe in-tube condensations
Figure, the foundation as design efficient condenser flow pattern judgement.
Data collection system of the present invention is accurate, by generating the collection of condensate liquid to condensation segment and steaming to not coagulating in gaseous mixture
The cooling of vapour, it may be verified that the accuracy of steam-flow meter.By measuring the temperature and pressure value of condensation segment inlet, can test simultaneously
Demonstrate,prove the accuracy of air and steam-flow meter.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is the structural schematic diagram of test section in the present invention；
Enhanced tube heat transfer coefficient in tubes trend chart when Fig. 3 is pure steam condensation；
Friction pressure drop trend chart in enhanced tube pipe when Fig. 4 is pure steam condensation；
Local heat transfer coefficient trend chart when Fig. 5 is gaseous mixture condensation containing fixed gas；
Wherein, 1 is air compressor machine, and 2 be air accumulator, and 3 be drier, and 4-1 is small-range spinner flowmeter, and 4-2 is wide range
Spinner flowmeter, 5 be gas heater, and 6 be boiler, and 7 be vortex-shedding meter, and 8 be forecooler, and 9 be the second water tank, and 10 be the
Two magnetic drive pumps, 11 be the second turbine flowmeter, and 12 be the second auxiliary panel cooler, and 13 be static mixer, and 14-1 is test
Section import, 14-2 are test section outlet, and 15 be test section, and 16 be the first water tank, and 17 be the first centrifugal pump, and 18 be the first turbine
Flowmeter, 19 be the first auxiliary panel cooler, and 20 be gas-liquid separator, and 21 is inhibit pond, and 22 be beaker, and 23 be liquidometer,
24 be thermoexcell, and 25 be outer tube, and 26 be blank flange, and 27 be flange, and 28 be pressure plate, and 29 be O-ring, and 30 be outer diameter
Tetrafluoro spacer, 31 be internal diameter Tetrafluoro spacer, and 32 be quartz glass tube.
Specific embodiment
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, those skilled in the art
Member can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Range.
Embodiments of the present invention are related to a kind of device for evaluating augmentation of heat transfer pipe in-tube condensation characteristic, as shown in Figure 1, should
Device is made of vapour system, test section, cooling water system, data collection system and matched pipeline valve.
The vapour system includes boiler 6, forecooler 8, air compressor machine 1, air accumulator 2, drier 3, gas heater 5 and quiet
State mixer 13；The boiler 6, forecooler 8 and static mixer 13 are sequentially connected, the air compressor machine 1, air accumulator 2, drier
3 and gas heater 5 be sequentially connected, the outlet of the gas heater 5 is also connected with static mixer 13.Air compressor machine 1 generates
Air needed for test is used as fixed gas, and air accumulator 2 is used for stable air pressure, and drier 3 contains in air for removing
Moisture, gas heater 5 for heating air to assigned temperature, four combinations can be provided for device stablize, not coagulating of drying
Gas.Boiler 6 generates the steam of specified medium, and for forecooler 8 for changing the steam quality in biphase gas and liquid flow, the two combines can be with
The gas-liquid mixture of stable, different mass dryness fraction conditions is provided for device.Static mixer 13 is for being sufficiently mixed air and two phase flow
Steam.Static mixer 13 can be such that two fluids is sufficiently mixed, and prevent lamination.
Wherein, forecooler 8 is a kind of multisection type double-tube heat exchanger, by changing effective heat transfer length and heat exchanger tube material
It can change the heat output Q in forecoolerpre.When carrying out pure steam condensation test, forecooler can be used for changing test section import
Steam quality: xi=1-Qpre/hfg, wherein hfgFor the steam latent heat of vaporization.When carrying out gaseous mixture condensation experiment, forecooler is available
In the mass fraction for changing test section inlet air:WhereinFor volume of air flow, ρa
For atmospheric density,For steam mass flow.
As shown in Fig. 2, the test section includes sequentially connected straight tube measuring section A, condensation segment B, measuring section C and viewing section
D；The straight tube measuring section A is provided with temperature, pressure and pressure difference instrument connection close to the inlet of condensation segment B；The condensation segment B includes
The thermoexcell 24 and outer tube 25 of coaxial arrangement, outside of 25 sets of the outer tube in thermoexcell 24, the reinforcing
The both ends of heat exchanger tube 24 and outer tube 25 are fixed by the pressure plate 28 with aperture, by adjusting pressure plate 28 when test
The thermoexcell 24 of open pore size, mountable various outer diameter models is tested.It is noted that working as straight tube measuring section A
Length when being 25 times of 24 internal diameter of thermoexcell, the influence of entry effect can be eliminated.The measuring section C is close to condensation segment
The exit of B is also provided with temperature, pressure and pressure difference instrument connection；Pass through formulaIt can
Calculate the two phase flow friction pressure drop of condensation segment, in formula, G is mass flux, and x is steam quality, PiAnd PoRespectively test section into
Outlet pressure, L are condensation segment length, ρlAnd ρvRespectively condensate liquid and vapour density, αvFor void fraction.The viewing section D is
Open conduit, the transparent pipeline can use quartz glass tube, and the side of the quartz glass tube is provided with strong for differentiating record
Change the high-speed camera of the flow pattern of gas-liquid two-phase flow in heat exchanger tube；The both ends of the test section B are also parallel with test section cooling water
Loop.
Steam/gaseous mixture in test section condenses in thermoexcell 24, and cooling water is logical in the annular that inner and outer pipes are formed
Forced convection heat transfer in road.By control cooling water flow and inlet temperature, so that the outlet mass dryness fraction x of test sectiono=xi-Qts/
hfgWith import mass dryness fraction xiDifference less than 0.2, wherein QtsFor test section heat output, hfgFor the steam latent heat of vaporization.It is average in pipe at this time
Heat transfer coefficient can be used as the partial condensation heat transfer coefficient under average mass dryness fraction, by measuring steam/gaseous mixture out temperature
With cooling water outlet and inlet temperature, i.e., heat transfer coefficient is acquired according to thermal resistance partition method: hc=do/[di·(1/U-Rw-1/ho)], wherein
U is overall heat-transfer coefficient, RwFor nominal wall resistance, hoFor convective heat-transfer coefficient outside pipe, diAnd doRespectively inside and outside thermoexcell
Diameter.
The cooling water system includes two cooling water loops, i.e. precooling zone cooling water loop and test section cooling water ring
Road.The test section cooling water loop includes the first water tank 16, the first magnetic drive pump 17, first flowmeter 18 and the first accessory plate
Formula cooler 19, the import of the first auxiliary of connection panel cooler 19, first auxiliary at the test section cooling water outlet
The outlet of panel cooler 19 is connected with the import of the first water tank 16, and the outlet of first water tank 16 passes through the first magnetic force
Pump 17 be connected at the test section cooling water inlet；First is provided between first magnetic drive pump 17 and cooling water inlet
Flowmeter 18.The precooling zone cooling water loop includes the second water tank 9, the second magnetic drive pump 10, second flowmeter 11 and second
Panel cooler 12 is assisted, structure is identical as test section cooling water loop, and difference is, the second auxiliary panel cooler 12
Connect at import and the forecooler cooling water outlet, the outlet of second water tank 9 by the second magnetic drive pump 10 with it is described
It is connected at forecooler cooling water inlet.Wherein, heating rod is provided in two water tanks, two magnetic drive pumps select high temperature resistant
Magnetic drive pump, pass through and change medium temperature in water tank and adjust cooling water flow, thus it is possible to vary the heat of cooling water loop transfer is negative
Lotus.Simultaneously to guarantee that the water in water tank maintains temperature constant state, cooling water is also being needed after precooling zone or test section by auxiliary
Panel cooler is helped, to take away extra heat.
Data collection system mainly includes flow, temperature, pressure, flow pattern and condensate liquid acquisition system.The master for needing to measure
Wanting parameter includes steam flow, air mass flow, precooling zone cooling water flow and out temperature, test section gas inlet and outlet temperature
Degree, pressure, test section cooling water flow and out temperature.Air mass flow is obtained by flow measurement, and steam flow is by flux of vortex street
It measures, cooling water flow is measured by turbine flowmeter.All temperature are measured by thermocouple, and pressure passes through pressure transmitter
It measures, pressure difference is measured by pressure difference transmitter.Flow pattern acquisition is mainly made of viewing section and high-speed camera, and two phase flow pattern is logical
High-speed camera is crossed to observe and record.Wherein the mass flow of steam, can also be by testing in addition to it can pass through flow measurement and obtain
Section installs condensate liquid acquisition device below, by inhibiting pond to collect still uncooled steam, uses formulaIt is right
Flow value is checked, m in formulacFor the condensate quality of collection, Δ H is that pond liquid level is inhibited to increase height, and A is to inhibit pond section
Product, t is experimental period, ρcFor condensate liquid density.Condensate liquid acquisition device mainly includes gas-liquid separator 20, beaker 22, inhibits
Pond 21 and liquidometer 23.In mixed vapour condensation, fixed gas mass content can be according to air quality flow and steam-flow meter
It acquires, while can also be according to ω=(pt-ps)/[pt-(1-Ms/Mg)ps] acquire, p in formulatFor test section inlet pressure, psFor
Test section import measures the corresponding saturation partial pressure of temperature, MsAnd MgThe respectively molecular weight of steam and fixed gas, this can be used as judgement
The foundation of flow measuring system accuracy in device.
It can be seen that the present invention is adopted for the augmentation of heat transfer tube wall face feature that temperature distribution is non-uniform, more difficult measurement is accurate
In-tube condensation heat transfer coefficient and pressure drop are obtained with thermal resistance partition method, the difficult point of measurement inner wall temperature is avoided the need for, can investigate
The influence of condition for import, structural parameters to condensation can provide Correlation equations for the thermal-design of efficient shell-and-tube cooler.Together
When the high-speed camera placed by the quartz glass tube and outlet of test section inlet and outlet installation, all kinds of reinforcings can be drawn out and passed
The flow pattern of heat pipe in-tube condensation, the foundation as design efficient condenser flow pattern judgement.
It is locally cold to measurement pure steam and gaseous mixture for below using vapor as steam and air as fixed gas
Solidifying heat transfer coefficient and the process of pressure drop are described in detail, and evaluate result is obtained.
When carrying out the heat transfer of pure steam in-tube condensation with drop test, air compressor 1 is in close state.Boiler 6 is opened,
What is stored in boiler storage tank in this example is water.It can change the pressure that vapor is generated in boiler by setting, control valve can
To adjust the flow of vapor.Vapor enters in forecooler 8, by adjusting cooling water temperature and flow in chilled(cooling) water return (CWR),
It can change the mass dryness fraction x for entering gas-liquid mixture in test section 15i.Gas-liquid mixture further condenses in test section 15, leads to
Cold water intaking temperature and flow in control test section chilled(cooling) water return (CWR) are crossed, mixture outlet mass dryness fraction x is madeoWith import mass dryness fraction xiDifference it is small
It is thus obtained to can be considered the mass flux and the local heat transfer coefficient under average mass dryness fraction along pipe range mean heat transfer coefficient in 0.2.
By gas-liquid separator 20, the condensate liquid beaker 22 that entire condensation process obtains is collected.Uncooled vapor is logical
The collection of inhibition pond 22 is crossed, liquidometer 23 can measure the increase height of liquid level.
When carrying out the experiment of mixed vapour in-tube condensation, air compressor 1 need to be then turned on, air be stored in air accumulator 2 with
Reduce flowed fluctuation, it is specified using being heated to after gas heater 5 by can remove the moisture contained after drier 3
Temperature.In static mixer 13, the gas-liquid mixture come out in the fixed gas and forecooler in compressor out carries out abundant
Mixing, then enters back into test section tube side.Remaining process is consistent when condensing with pure steam.It is mixed by changing gas-liquid in experiment
The mass dryness fraction for closing object can further change the mass ratio that fixed gas accounts for total gas.
It must guarantee the fluctuation of steam flow, air mass flow and two strands of cooling water flows and outlet temperature not in test process
More than 5% and the time is more than 10min, can formal start recording data.Data mainly include by data collector automatic collection
Steam flow, air mass flow, precooling zone cooling water flow and out temperature, test section gas inlet and outlet temperature, pressure, test
Section cooling water flow and out temperature.Biphase gas and liquid flow can be also observed when test by the quartz glass tube 32 of viewing section strong
Change the flow pattern in pipe, and available high speed camera is recorded, to further draw out all kinds of augmentation of heat transfer pipe in-tube condensations
Flow pattern.
In this testing example, 2 groups of different types of tests have been carried out altogether, and 1 group is pure water vapor in light pipe and No. 1,2
Number and No. 3 enhanced tubes in condensation, another 1 group for containing air as fixed gas when condensation of the mixed vapour in No. 5 enhanced tubes.Figure
3 be light pipe and enhanced tube heat transfer coefficient in tubes trend chart when vapor condenses, and Fig. 4 is light pipe and reinforcing when vapor condenses
Friction pressure drop trend chart in pipe pipe.Fig. 5 is that local heat transfer coefficient variation becomes when enhanced tube includes fixed gas gaseous mixture condensation
Gesture figure.
It is proved by above example, the present invention can accurately test out localized heat transfer system of the pure steam in enhanced tube
Several and pressure drop, and partial condensation heat transfer and flow resistance characteristic of the gaseous mixture containing fixed gas in enhanced tube.The present invention overcomes
The shortcomings that prior art needs to measure inner wall temperature just and can obtain local heat transfer coefficient, to promoting efficient shell-and-tube cooler
Design level provides important evidence.
Claims (6)
1. a kind of device for evaluating augmentation of heat transfer pipe in-tube condensation characteristic, including vapour system and test section, the test section
Entrance is connected with vapour system, and exit is connected with gas-liquid separator, which is characterized in that the test section includes being sequentially connected
Straight tube measuring section, condensation segment, measuring section and viewing section；The straight tube measuring section close to the inlet of condensation segment be provided with temperature,
Pressure and pressure difference instrument connection；The condensation segment includes the thermoexcell and outer tube of coaxial arrangement, and the housing pipe sleeve is strong
The both ends of the outside of change heat exchanger tube, the thermoexcell and outer tube are fixed by the pressure plate with aperture；The survey
It measures section and is also provided with temperature, pressure and pressure difference instrument connection close to the exit of condensation segment；The viewing section is transparent pipeline, described
The side of open conduit is provided with the high-speed camera for differentiating the flow pattern of gas-liquid two-phase flow in record thermoexcell；The survey
The both ends of examination section are also parallel with test section cooling water loop.
2. the device of evaluation augmentation of heat transfer pipe in-tube condensation characteristic according to claim 1, which is characterized in that the steam
System includes boiler, forecooler, air compressor machine, air accumulator, drier, gas heater and static mixer；The boiler, pre-cooling
Device and static mixer are sequentially connected, and the air compressor machine, air accumulator, drier and gas heater are sequentially connected, the gas
The outlet of heater is also connected with static mixer；The forecooler is multisection type double-tube heat exchanger, and both ends are parallel with precooling zone
Cooling water loop；When the forecooler is for changing test section inlet steam mass dryness fraction: xi=1-Qpre/hfg, wherein hfgFor steam
The latent heat of vaporization, QpreFor the heat output in forecooler, when carrying out gaseous mixture condensation experiment, forecooler for changing test section into
The mass fraction of mouth air:WhereinFor volume of air flow, ρaFor atmospheric density,
For steam mass flow.
3. the device of evaluation augmentation of heat transfer pipe in-tube condensation characteristic according to claim 1, which is characterized in that the straight tube
The length of measuring section is 25 times of enhanced heat exchange bore；Steam/gaseous mixture in the test section is cold in thermoexcell
It is solidifying, cooling water forced convection heat transfer in the circular passage that inner and outer pipes are formed；By control cooling water flow and inlet temperature, make
The outlet mass dryness fraction of test section and the difference of import mass dryness fraction are obtained less than 0.2, mean heat transfer coefficient can be used as in thermoexcell at this time
Partial condensation heat transfer coefficient under average mass dryness fraction, passes through measurement steam/gaseous mixture out temperature and test section cooling water ring
Road out temperature acquires partial condensation heat transfer coefficient: h according to thermal resistance partition methodc=do/[di·(1/U-Rw-1/ho)], wherein
U is overall heat-transfer coefficient, RwFor nominal wall resistance, hoFor convective heat-transfer coefficient outside pipe, diAnd doRespectively inside and outside thermoexcell
Diameter；The two phase flow friction pressure drop of condensation segment passes throughIt calculates, wherein G is logical for quality
Amount, x are that steam is averaged mass dryness fraction, PiAnd PoRespectively test section inlet and outlet pressure, L are condensation segment length, ρlAnd ρvRespectively condense
Liquid and vapour density, αvFor void fraction.
4. the device of evaluation augmentation of heat transfer pipe in-tube condensation characteristic according to claim 1, which is characterized in that the test
Installation gas-liquid separator is collected condensate liquid to section below, by inhibiting pond to collect still uncooled steam, passes throughFlow value is checked, wherein mcFor the condensate quality of collection, Δ H is that pond liquid level is inhibited to increase
Highly, A is to inhibit pond sectional area, and t is experimental period, ρcFor condensate liquid density；When mixed vapour condenses, fixed gas mass content
ω=(pt-ps)/[pt-(1-Ms/Mg)ps], wherein ptFor test section inlet pressure, psFor the corresponding steaming of test section inlet temperature
Vapour saturation partial pressure, MsAnd MgThe respectively molecular weight of steam and fixed gas.
5. the device of evaluation augmentation of heat transfer pipe in-tube condensation characteristic according to claim 1, which is characterized in that the test
Section cooling water loop includes the first water tank, the first magnetic drive pump, first flowmeter and the first auxiliary panel cooler, the test
The import of the first auxiliary of connection panel cooler, the outlet and first of the first auxiliary panel cooler at section cooling water outlet
The import of water tank is connected, and the outlet of first water tank passes through the first magnetic drive pump and phase at the test section cooling water inlet
Even；It is provided with first flowmeter between first magnetic drive pump and cooling water inlet, is provided with and adds in first water tank
Hot pin.
6. the device of evaluation augmentation of heat transfer pipe in-tube condensation characteristic according to claim 2, which is characterized in that the pre-cooling
Section cooling water loop includes the second water tank, the second magnetic drive pump, second flowmeter and the second auxiliary panel cooler, the pre-cooling
The import of the second auxiliary of connection panel cooler, the outlet and second of the second auxiliary panel cooler at device cooling water outlet
The import of water tank is connected, and the outlet of second water tank passes through the second magnetic drive pump and phase at the forecooler cooling water inlet
Even；It is provided with second flowmeter between second magnetic drive pump and cooling water inlet, is provided with and adds in second water tank
Hot pin.
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| CN111693559A (en) * | 2020-06-22 | 2020-09-22 | 中国核动力研究设计院 | Vapor droplet mass flow separation measuring device and method for gas-phase mixture |
| CN112362697A (en) * | 2020-11-30 | 2021-02-12 | 西南石油大学 | Inner tube rotating concentric sleeve forced convection heat exchange experimental device and method |
| CN114624284A (en) * | 2022-03-02 | 2022-06-14 | 哈尔滨工程大学 | Detachable circumferential multi-measurement-point type pure steam condensation heat exchange experimental device |
| CN117250226A (en) * | 2023-11-13 | 2023-12-19 | 甘肃蓝科石化高新装备股份有限公司 | Plate type heat transfer element working medium internal circulation small temperature difference phase change thermal test platform |
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| CN111060557A (en) * | 2020-01-17 | 2020-04-24 | 南京航空航天大学 | Axial rotation oscillating heat pipe test device and use method thereof |
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