CN102411863B - Teaching experimental apparatus for measuring two-phase convective heat-transfer coefficient of micropipe - Google Patents
Teaching experimental apparatus for measuring two-phase convective heat-transfer coefficient of micropipe Download PDFInfo
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- CN102411863B CN102411863B CN 201110208846 CN201110208846A CN102411863B CN 102411863 B CN102411863 B CN 102411863B CN 201110208846 CN201110208846 CN 201110208846 CN 201110208846 A CN201110208846 A CN 201110208846A CN 102411863 B CN102411863 B CN 102411863B
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Abstract
The invention discloses a teaching experimental apparatus for measuring the two-phase convective heat-transfer coefficient of a micropipe. A micro injection pump is connected with an inlet of a detachable phase mixer through a connecting pipe fitting, a gas storage tank is connected with another inlet of the detachable phase mixer through the connecting pipe fitting, an outlet of the detachable phase mixer is connected with a glass connecting tube, a micron stainless steel tube, a fluid type observer, and the connecting pipe fitting in sequence. The micron stainless steel tube is externally provdied with an insulated black cavity, the inlet end and outlet end of the stainless tube are provided with thermocouples, the stainless steel tube is also connected with heating leads and connected with a power-adjustable heating unit, and the corresponding part of the stainless steel tube is provdied with an online infrared heat detector, the thermocouples are connected with a computer through a data acquisition unit, and the online infrared heat detector and the power-adjustable heating unit are connected with the computer. The teaching experimental apparatus disclosed by the invention aims at the purpose of teaching experiment, takes the two-phase convective heat transfer in the stainless steel tube as a research object, is simple in structure, high in precision, good in stability, and can be used for achieving remote teaching.
Description
Technical field
The present invention relates to measure two-phase convective heat-transfer coefficient field, relate in particular to a kind of experiment device for teaching of measuring microtubule two-phase convective heat-transfer coefficient.
Background technology
The flow operating mode of gas-liquid two-phase fluid often runs in the industry such as power, chemical industry, nuclear energy, refrigeration, oil, metallurgy.Also exist the heat transfer problem of two-phase fluid in the equipment with heat interchange of these industry.For example, extensively there be flowing and heat transfer problem of gas-liquid two-phase fluid in the various boiling tubes in nuclear power station and heat power station, various air and liquid mixer, gas-liquid separator, various heat exchanger, rectification column, chemical reaction equipment, various condenser and other equipment.The gas-liquid two-phase fluid convective heat-transfer coefficient has reflected the exchange capability of heat of fluid and solid surface, and its physical significance is for when the temperature difference between fluid and solid surface is 1K, and the heat that unit wall area can transmit in the unit interval, unit are W/ (m
2K).Because the flow pattern of gas-liquid two-phase is complicated, diabatic process is had a significant impact, to compare with monophasic fluid, the diabatic process research of gas-liquid two-phase is more difficult.For the Chemical Engineering Specialty student, understand and grasp the various knowledge that the assay method of two-phase fluid convective heat-transfer coefficient and two-phase fluid conduct heat, for economical and develop reliably, design and the above-mentioned commercial unit that turns round has great importance.
In recent years, along with the widespread use of microscale technology at aspects such as pharmaceuticals industry, high flux heat exchanger, condensing plants, the Two-phase Flow ﹠ Thermal Conduction characteristic in the microchannel has caused increasing concern.In microchannel, the research of gas-liquid two-phase convection heat transfer' heat-transfer by convection provides important cold mould experimental data for the design and development of miniature heat-transfer equipment, microreactor.Particularly for the exploitation of strong heat release gas liquid reaction microchannel reactor, improve its reaction safety, optimize its reaction scheme etc. vital effect is arranged.Yet due to the diversity of diphasic flow flow pattern and the complicacy of diabatic process, its research is not also goed deep into.The erratic behavior that two-phase flow ancient piece of jade, round, flat and with a hole in its centre surface temperature changes causes the method for traditional thermocouple measurement can not well describe ancient piece of jade, round, flat and with a hole in its centre surface temperature distribution in gamut, need to take other temperature survey means.
The equipment of laboratory measurement two-phase convective heat-transfer coefficient is also fewer, and mainly in the glass round tube of conventional yardstick, by contrast, the two-phase convection heat transfer' heat-transfer by convection characteristic of stainless-steel tube pipe is more meaningful for commercial production.So far, for the education experiment purposes, the two-phase convection heat transfer' heat-transfer by convection in the stainless-steel tube is as research object, and is simple to operate, precision is high, the two-phase convective heat-transfer coefficient equipment of good stability report not also.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of experiment device for teaching of measuring microtubule two-phase convective heat-transfer coefficient is provided.
the experiment device for teaching of measuring microtubule two-phase convective heat-transfer coefficient comprises the high precision micro syringe pump, tensimeter, gas-holder, the first connecting tube, the second connecting tube, flowmeter, quick detachable mixed-phase device, constant temperature water bath, the glass connecting pipe, the first seal, adiabatic black cavity, the micron order stainless-steel tube, 50 microns K type thermopairs of entrance point, the adjustable power type heating unit, online infra-red heat detector, data acquisition unit, bleeding point, 50 microns K type thermopairs of endpiece, the second seal, the flow pattern viewer, the 3rd connecting tube, wet tank, computing machine, micro syringe pump is connected with the first import of quick detachable mixed-phase device through the first connecting tube, gas-holder is connected with the second import of quick detachable mixed-phase device through the second connecting tube, the outlet of quick detachable mixed-phase device and glass connecting pipe, the micron order stainless-steel tube, the flow pattern viewer, the 3rd connecting tube one end is connected in turn, be provided with wet tank below the 3rd connecting tube other end, the micron order stainless-steel tube is provided with adiabatic black cavity outward, the micron order stainless-steel tube is provided with 50 microns K type thermopairs of entrance point, 50 microns K type thermopairs of endpiece, also be connected with simultaneously two heating wires and be connected with the adjustable power type heating unit, and be provided with online infra-red heat detector in micron order stainless-steel tube corresponding section, be respectively equipped with the first seal between micron order stainless-steel tube two ends and adiabatic black cavity, the second seal, gas-holder is provided with tensimeter, be connected to flowmeter on the second connecting tube, quick detachable mixed-phase device peripheral hardware has constant temperature water bath, adiabatic black cavity is provided with bleeding point, 50 microns K type thermopairs of entrance point, 50 microns K type thermopairs of endpiece are connected with computing machine by data acquisition unit, online infra-red heat detector is connected with computing machine with the adjustable power type heating unit.
The caliber of described micron order stainless-steel tube is 0.1mm-1.5mm.Described flow pattern viewer adopts glass material, and surrounding axially has the circular channel of the different inner diameters of a plurality of 0.1mm-1.5mm, and flow pattern viewer central shaft is fixed on adiabatic black chamber outer wall.
The difficult point that the microtubule two-phase convective heat-transfer coefficient that the present invention is directed to is measured, combining with teaching needs, adopt online infra-red heat detector to measure the outside wall surface temperature, non-contact measurement does not affect heat transfer process, fast response time, easy for installation, temperature that can any infinitesimal section of accurate description outside wall surface obtains continuous temperature distribution history; Thereby the internal diameter that adopts quick detachable mixed-phase device can change as required mixed-phase device changes two phase flow pattern, easy accessibility; Employing flow pattern viewer can overcome the problem that stainless-steel tube can't judge flow state in pipe, and the micron order stainless-steel tube of coupling different tube diameters guarantees that stainless-steel tube is interior and flow pattern in the flow pattern viewer is consistent; Be connected with computing machine by the RS232 protocol module, by computer control output power of power supply size, time, mode, Real Time Observation is imported and exported fluid temperature (F.T.), ancient piece of jade, round, flat and with a hole in its centre surface temperature, can realize remote teaching.
Description of drawings
Fig. 1 is the structural representation of measuring the experiment device for teaching of microtubule two-phase convective heat-transfer coefficient;
in figure, high precision micro syringe pump 1, tensimeter 2, gas-holder 3, the first connecting tube 4, the second connecting tube 5, flowmeter 6, quick detachable mixed-phase device 7, constant temperature water bath 8, glass connecting pipe 9, the first seal 10, adiabatic black cavity 11, micron order stainless-steel tube 12, 50 microns K type thermopairs 13 of entrance point, adjustable power type heating unit 14, online infra-red heat detector 15, data acquisition unit 16, bleeding point 17, 50 microns K type thermopairs 18 of endpiece, the second seal 19, flow pattern viewer 20, the 3rd connecting tube 21, wet tank 22, computing machine 23.
Fig. 2 is the FB(flow block) of measuring the experiment device for teaching of microtubule two-phase convective heat-transfer coefficient.
Embodiment
as shown in Figure 1, the experiment device for teaching of measuring microtubule two-phase convective heat-transfer coefficient comprises high precision micro syringe pump 1, tensimeter 2, gas-holder 3, the first connecting tube 4, the second connecting tube 5, flowmeter 6, quick detachable mixed-phase device 7, constant temperature water bath 8, glass connecting pipe 9, the first seal 10, adiabatic black cavity 11, micron order stainless-steel tube 12, 50 microns K type thermopairs 13 of entrance point, adjustable power type heating unit 14, online infra-red heat detector 15, data acquisition unit 16, bleeding point 17, 50 microns K type thermopairs 18 of endpiece, the second seal 19, flow pattern viewer 20, the 3rd connecting tube 21, wet tank 22, computing machine 23, micro syringe pump 1 is connected with the first import of quick detachable mixed-phase device 7 through the first connecting tube 4, gas-holder 3 is connected with the second import of quick detachable mixed-phase device 7 through the second connecting tube 5, the outlet of quick detachable mixed-phase device 7 and glass connecting pipe 9, micron order stainless-steel tube 12, flow pattern viewer 20, the 3rd connecting tube 21 1 ends are connected in turn, be provided with wet tank 22 below the 3rd connecting tube 21 other ends, the outer black cavity 11 of thermal insulation that is provided with of micron order stainless-steel tube 12, micron order stainless-steel tube 12 is provided with 50 microns K type thermopairs 13 of entrance point, 50 microns K type thermopairs 18 of endpiece, also be connected with simultaneously two heating wires and be connected with adjustable power type heating unit 14, and be provided with online infra-red heat detector 15 in micron order stainless-steel tube 12 corresponding sections, be respectively equipped with the first seal 10 between micron order stainless-steel tube 12 two ends and adiabatic black cavity 11, the second seal 19, gas-holder 3 is provided with tensimeter 2, be connected to flowmeter 6 on the second connecting tube 5, quick detachable mixed-phase device 7 peripheral hardwares have constant temperature water bath 8, adiabatic black cavity 11 is provided with bleeding point 17, 50 microns K type thermopairs 13 of entrance point, 50 microns K type thermopairs of endpiece 18 are connected with computing machine 23 by data acquisition unit 16, online infra-red heat detector 15 is connected with computing machine 23 with adjustable power type heating unit 14.
The caliber of described micron order stainless-steel tube 12 is 0.1mm-1.5mm.Described flow pattern viewer 20 adopts glass material, surrounding axially has the circular channel of the different inner diameters of a plurality of 0.1mm-1.5mm, flow pattern viewer 20 central shafts are fixed on adiabatic black cavity (11) outer wall, rotate the micron order stainless-steel tube 12 of flow pattern viewer 20 coupling different tube diameters, be convenient to the observation of students variations in flow patterns.
Described adjustable power type heating unit comprises constant current heating source, RS232 protocol module and computing machine; The constant current heating source is connected with the RS232 protocol module, and the RS232 protocol module is connected with computing machine.Described online infra-red heat detector 15 can detect the micron order stainless-steel tube 12 axial continuous temperatures of outside wall surface and distribute.Described quick detachable mixed-phase device 7 can be changed as required size and change two phase flow pattern.
As shown in Figure 2, the adjustable power type heating unit is connected with computing machine by the RS232 protocol module, by computer control output current size, time and the way of output; Input computing machine after two-phase flow convection heat transfer' heat-transfer by convection detecting unit output signal is processed by data acquisition unit.
Measure the experiment device for teaching of microtubule two-phase convective heat-transfer coefficient, its data processing method is as follows:
According to direct supply input current and bringing-up section stainless steel microtubule resistance, can calculate power input, formula is:
（1）
Wherein
Be power input,
Be input current,
Be bringing-up section stainless steel microtubule resistance.
The power that therefore, can obtain the microchannel unit area is:
Wherein
Be the power input of microchannel unit area,
Be the microchannel internal diameter,
Be the microchannel heading-length.
Local outer ancient piece of jade, round, flat and with a hole in its centre surface temperature records by online infra-red heat detector, and because local internal face temperature is difficult for measuring, we adopt one dimension heat conduction hypothesis, can obtain local interior's surface temperature and be:
Wherein,
Be local internal face temperature,
Be local outside wall surface temperature,
Be microchannel unit volume power input,
Be the microchannel material thermal conductivity,
Be the microchannel external diameter.
Due to the flow characteristics of two-phase flow, local ancient piece of jade, round, flat and with a hole in its centre surface temperature changes along with the variation of time, and the average ancient piece of jade, round, flat and with a hole in its centre surface temperature data of generally getting about 15 minutes are calculated as the temperature value of this point.
The partial fluid temperature
Can import and export the laggard line linearity interpolation calculation of fluid temperature (F.T.) by measurement and obtain, get equally medial temperature about 15 minutes as actual temperature.
By the above-mentioned power input of unit area, local interior ancient piece of jade, round, flat and with a hole in its centre surface temperature and the local fluid temperature (F.T.) of measuring, according to the definition of convective heat-transfer coefficient, can calculate microchannel two-phase flow local convection heat transfer coefficient:
Claims (3)
1. experiment device for teaching of measuring microtubule two-phase convective heat-transfer coefficient, it is characterized in that comprising high precision micro syringe pump (1), tensimeter (2), gas-holder (3), the first connecting tube (4), the second connecting tube (5), flowmeter (6), quick detachable mixed-phase device (7), constant temperature water bath (8), glass connecting pipe (9), the first seal (10), adiabatic black cavity (11), micron order stainless-steel tube (12), 50 microns K type thermopairs of entrance point (13), adjustable power type heating unit (14), online infra-red heat detector (15), data acquisition unit (16), bleeding point (17), 50 microns K type thermopairs of endpiece (18), the second seal (19), flow pattern viewer (20), the 3rd connecting tube (21), wet tank (22), computing machine (23), micro syringe pump (1) is connected through first import of the first connecting tube (4) with quick detachable mixed-phase device (7), gas-holder (3) is connected through second import of the second connecting tube (5) with quick detachable mixed-phase device (7), the outlet of quick detachable mixed-phase device (7) and glass connecting pipe (9), micron order stainless-steel tube (12), flow pattern viewer (20), the 3rd connecting tube (21) one ends are connected in turn, the 3rd connecting tube (21) other end below is provided with wet tank (22), the outer black cavity (11) of thermal insulation that is provided with of micron order stainless-steel tube (12), micron order stainless-steel tube (12) is provided with 50 microns K type thermopairs of entrance point (13), 50 microns K type thermopairs of endpiece (18), also be connected with simultaneously two heating wires and be connected with adjustable power type heating unit (14), and be provided with online infra-red heat detector (15) in micron order stainless-steel tube (12) corresponding section, be respectively equipped with the first seal (10) between micron order stainless-steel tube (12) two ends and adiabatic black cavity (11), the second seal (19), gas-holder (3) is provided with tensimeter (2), be connected to flowmeter (6) on the second connecting tube (5), quick detachable mixed-phase device (7) peripheral hardware has constant temperature water bath (8), adiabatic black cavity (11) is provided with bleeding point (17), 50 microns K type thermopairs of entrance point (13), 50 microns K type thermopairs of endpiece (18) are connected with computing machine (23) by data acquisition unit (16), online infra-red heat detector (15) is connected with computing machine (23) with adjustable power type heating unit (14).
2. a kind of experiment device for teaching of measuring microtubule two-phase convective heat-transfer coefficient according to claim 1, the caliber that it is characterized in that described micron order stainless-steel tube (12) is 0.1mm-1.5mm.
3. a kind of experiment device for teaching of measuring microtubule two-phase convective heat-transfer coefficient according to claim 1, it is characterized in that described flow pattern viewer (20) adopts glass material, surrounding axially has the circular channel of the different inner diameters of a plurality of 0.1mm-1.5mm, and flow pattern viewer (20) central shaft is fixed on adiabatic black cavity (11) outer wall.
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| CN111044563B (en) * | 2020-01-03 | 2022-04-29 | 重庆大学 | Method for rapidly testing heat transfer performance of high-temperature inorganic nonmetallic material based on hot wire method |
| CN111524619B (en) * | 2020-06-19 | 2022-06-07 | 中国核动力研究设计院 | Experimental device and method for researching dynamic self-feedback characteristic of natural circulation system |
| CN113834628A (en) * | 2021-09-06 | 2021-12-24 | 西安电子科技大学 | Micro-channel mechanism for inducing two-phase flow |
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