CN101581683B - Experimental device for nano fluid vacuum heat pipe heat transfer characteristics under magnetic field effect - Google Patents
Experimental device for nano fluid vacuum heat pipe heat transfer characteristics under magnetic field effect Download PDFInfo
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- CN101581683B CN101581683B CN2009103037897A CN200910303789A CN101581683B CN 101581683 B CN101581683 B CN 101581683B CN 2009103037897 A CN2009103037897 A CN 2009103037897A CN 200910303789 A CN200910303789 A CN 200910303789A CN 101581683 B CN101581683 B CN 101581683B
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- 239000012530 fluid Substances 0.000 title claims abstract description 34
- 238000012546 transfer Methods 0.000 title claims abstract description 15
- 230000005426 magnetic field effect Effects 0.000 title 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 230000009471 action Effects 0.000 claims abstract description 9
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- 239000002122 magnetic nanoparticle Substances 0.000 claims 1
- 230000005494 condensation Effects 0.000 abstract description 8
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Abstract
The invention discloses an experimental device for heat transfer characteristics of a nanofluid vacuum heat pipe under the action of a magnetic field. The heat pipe comprises a vacuum heat pipe (1), nano fluid is filled in the vacuum heat pipe (1), an electric heating wire (17) is wound on the lower portion of the vacuum heat pipe (1), a heat preservation layer (6) is arranged on the outer side of the electric heating wire (17), the upper portion of the vacuum heat pipe (1) is arranged in a condensation pipe (3), the condensation pipe (3) is provided with an inlet end (9) and an outlet end (2), the inlet end (9) is connected with a water tank (14) through a pipeline and a flowmeter (10), a spiral coil (16) is arranged on the outer side of the vacuum heat pipe (1), the spiral coil (16) is connected with a pressure regulator (15), a plurality of thermocouples (8) are arranged on the outer surface wall of the vacuum heat pipe (1) from top to bottom, and the output ends of the. The invention has simple structure, low cost and convenient use, and can measure the heat transfer characteristics of the nanofluid vacuum heat pipe under the action of different magnetic fields.
Description
Technical field
The present invention relates to the experimental provision of nanometer fluid vacuum adopting heat pipes for heat transfer characteristic under a kind of the action of a magnetic field.
Background technology
Along with developing rapidly of nanometer material science, the suitability for industrialized production of nano particle becomes a reality, and since the nineties, the researchist begins exploration nano material technology is applied to the augmentation of heat transfer field.Nineteen ninety-five, the researcher of U.S. Argonne National Laboratory at first carries out and add the research of nano powder with augmentation of heat transfer in liquid working substance, and at first proposes the notion of nano-fluid.Nano-fluid is meant between the metal of 1～100 nanometer, metal oxide, nitride, carbonide, nano particle such as nonmetal, is distributed to the nano-fluid that forms in traditional working medium such as water, oil, ethylene glycol by the method that adds or do not add spreading agent.
Nano material is because of having small-size effect, its behavior approaches fluid molecule, compare with traditional heat-transfer fluid or the fluid that contains the micron order solid particle, nano-fluid has plurality of advantages: (1) nano particle has bigger specific surface, it is expected to increase substantially the capacity of heat transmission and the thermal capacity of fluid, thereby reduce the energy consumption of ebullator, reduce cost, alleviate the volume of heat exchanger.(2) less because of the nano particle yardstick, its Brownian movement in fluid media (medium) can be resisted the coagulation that gravity causes, thereby can keep stable suspersion for a long time.(3) because its particle diameter is less, also can be used as lubricant medium, thereby alleviate the wearing and tearing of pipeline and equipment.(4) because nano particle diameter is less, also be expected to combine with heat pipe and develop new micro heat transmission equipment, be applied in microelectronics and message area especially.
The research of nano-fluid and the solution that is applied as some difficult problems of many high-tech areas aspect provide new method and thinking, as: (1) utilizes nano-fluid that engine is worked under the temperature of more optimizing, make cooling system do forr a short time, lighter, thereby the fuel saving consumption.(2) cutter that is used for machining cools off, and can improve process velocity, the precision of workpiece, and prolongs the serviceable life of cutter.(3) be used for power electronics industry, heat dissipation problem is operational efficiency, speed, the important restraining factors in life-span of a lot of devices such as computing machine, microelectronics, micromotor, large-size machine, transformer, integrated circuit, communication system etc., and efficient nano fluid cooling technology then can play a significant role.(4) be used for the refrigerant of heating ventilation air-conditioning system and the heating agent that sun power reclaims, can improve its heat exchange property greatly, reduce volume, raise the efficiency.(5) be used to make various heat interchanger more efficiently, heating radiator and heat pipe heat exchanging device etc.
Nano-fluid is as a kind of new enhanced heat-transfer working medium, and being mainly used in mobile the flowing with heat transfer aspect, particularly gas-liquid two-phase of two-phase flow will be the effective way that increases substantially the heat exchange effect.But also mainly concentrating on, the research of nano-fluid at present force single-phase flowing to be gone up and the pool boiling heat exchange in the pipe.And also do not see at the phase transformation boiling heat transfer that adds under the magnetic field condition for nano-fluid.
Summary of the invention
In order to solve the technical matters of nano-fluid reinforcement vacuum heat-pipe heat transfer characteristic under the action of a magnetic field, the invention provides the experimental provision of nanometer fluid vacuum adopting heat pipes for heat transfer characteristic under a kind of the action of a magnetic field.
The technical scheme that the present invention solves the problems of the technologies described above is: comprise vacuum heat-pipe, nano-fluid is housed in the vacuum heat-pipe, the bottom of vacuum heat-pipe is wound with heating wire, the outside of heating wire is provided with heat-insulation layer, the top of vacuum heat-pipe places condenser pipe, condenser pipe is provided with entrance point and endpiece, entrance point is through pipeline, flowmeter links to each other with the tank that is positioned at eminence, from low tank (13), draw water in the screw clamp with water pump, the outside of vacuum heat-pipe is provided with spiral winding, spiral winding links to each other with pressure regulator, and a plurality of thermopairs place vacuum heat-pipe appearance wall from top to bottom, and the output terminal of thermopair links to each other with datalogger.
Technique effect of the present invention is: the present invention is simple in structure, cost is low, easy to use, is the experimental provision of nanometer fluid vacuum adopting heat pipes for heat transfer characteristic under a kind of the action of a magnetic field preferably; The present invention can be by changing the size in magnetic field, and its best heat exchange operating mode is determined in the variation of test heat pipe heat exchanging coefficient.
The present invention is further illustrated to closing accompanying drawing below.
Description of drawings
Fig. 1 is a structural drawing of the present invention.
Fig. 2 is the graph of a relation of magnetic fluid heat pipe condenser section out temperature difference among the present invention and magnitude of field intensity.
Embodiment
Referring to Fig. 1, the present invention includes vacuum heat-pipe 1, the bottom of vacuum heat-pipe 1 is wound with heating wire 17, the outside of heating wire 17 is provided with heat-insulation layer 6, the top of vacuum heat-pipe 1 places condenser pipe 3, condenser pipe 3 is provided with entrance point 9, endpiece 2, entrance point 9 is through pipeline and flowmeter 10, tank 14 links to each other, tank 14 is positioned at eminence, draw water from low tank 13 in the screw clamp 14 with water pump 11, spiral winding 16 is established in the outside of vacuum heat-pipe 1, and spiral winding 16 links to each other with pressure regulator 15, vacuum heat-pipe 1 appearance is provided with the temperature that a plurality of thermopairs 8 are used to measure heat pipe 1 from top to bottom, and the output terminal of thermopair 8 links to each other with datalogger 12.
Take by weighing nanometer Fe respectively
3O
40.5g, 1.0g, 2.5g, 5g, 10g; Mean grain size 50nm is added to the nano material that weighs up respectively in the 500ml deionized water, forms magnetic nanometer suspending liquid, is aided with ultrasonic vibration then, to obtain suspending stabilized nano-fluid suspending liquid.In this experiment, keep hyperacoustic power and frequency constant, every kind of nano-fluid is acted on 4-8 hour respectively, prepare required nano-fluid.
The magnetic Nano fluid that configures is filled in the heat pipe, then heat pipe is evacuated, and sealing.The liquid filled ratio of heat pipe is 50% of a bringing-up section.Heat pipe adopts copper pipe, the long 1065mm of copper pipe, external diameter 12.5mm, internal diameter 10mm, the long 503mm of heat pipe evaporator section, condensation segment length 506mm.Heat to heat pipe evaporator section by the heat tape of voltage stabilizer by a 250w, condensation segment is by overcoat condenser pipe water quench.The heat Calculation that the heat flux of thermal siphon transmission is taken away by chilled water.Chilled water import and export temperature is used two 0.1 grade of thermometer measures respectively.Stable in order to guarantee cooling water flow, adopt the high water head tank of 2500mm of carry potential overflow ring to supply with chilled water through spinner-type flowmeter.The pipe surface temperature of heat pipe all adopts thermocouple measurement: the evaporator section pipe surface temperature is measured by 4 pairs of nickel chromium triangle one Nickel-Silicom thermocouples.The adiabatic section is measured by a pair of nickel chromium triangle one Nickel-Silicom thermocouple.
Q
Output=C
Fluid* G
Cooling water flow* (T
Go outOne T
Advance)
In the following formula: Q
OutputThe heat of expression output; C
FluidThe specific heat of expression fluid;
G
Cooling water flowThe flow of expression chilled water;
T
Advance, T
Go outThe import and export temperature of representing chilled water respectively.
The condensation segment of heat pipe 1 adopts the water cooling from the elevated tank 14 of voltage stabilizing in this experiment, and the open degree that changes the water route valve can be regulated cooling water flow.Thereby the cooling load of adjusting heat pipe.The exchange capability of heat of water is very strong, and this experiment table small investment is easy to use, and experiment power can reach very high.
Adopt the wall surface temperature of 8 thermocouple measurement heat pipe evaporation ends, insulating end, condensation end in this experiment, evaporation ends evaporation ends import and export temperature and condensation end import and export temperature all adopt thermal resistance to measure.
Use the thermopair of diameter, the thermal center means of spot welds is measured the wall surface temperature on shell wall as Ф 0.1-0.3mm.When measuring evaporation ends import and export temperature and condensation end import and export temperature, thermal resistance is penetrated to seal stretch in the fluid making a call to an aperture in the middle of the rubber stopper.Thermopair, the thermal resistance other end link to each other with datalogger 12.
Because heat pipe is when heating with heat tape, bringing-up section environment heat radiation towards periphery, and heat dissipation capacity can't calculate, therefore, the adding heat and can't calculate of bringing-up section, is so the heat that system is transmitted can not obtain by bringing-up section.The heat flux of the thermal siphon transmission of this experiment is to be as the criterion by the heat that chilled water is taken away to calculate.Stable in order to guarantee cooling water flow, adopt the carry potential overflow ring, 2500 millimeters high water head tanks supply with chilled water through spinner-type flowmeter, the import and export water temperature is measured with 0.1 grade of microthermometer.The flow of chilled water is as the criterion with the average discharge of experimentation, and experiment timing precision is 1 second a stopwatch.
Heat that the cooling section chilled water the takes away transmission heat as heat pipe is adopted in Yin Ben experiment, so require to have reliable and stable insulation measure, is provided with heat-insulation layer 6 at the skin of bringing-up section.
For the better magnetic fluid nanometer heat pipe of giving applies certain magnetic field, and can at random regulate the size in magnetic field, adopt pressure regulator to produce magnetic field for direct current in this experiment to spiral winding.
Referring to Fig. 2, Fig. 2 is the graph of a relation of magnetic fluid heat pipe condenser section out temperature difference among the present invention and magnitude of field intensity.When change of magnetic field strength, along with the variation of time, magnetic fluid heat pipe condenser section out temperature difference also fluctuates thereupon when adding vertically magnetic field.When not adding magnetic field and be magnetic field intensity and being o Gs, import and export temperature difference minimum, this explanation exchange capability of heat minimum.Along with the increase of adding magnetic field intensity, import and export the temperature difference along with increase, this is just explanation also, and magnetic field intensity is big more.Increase along with magnetic field intensity, the heat-exchange performance of heat pipe constantly strengthens, compare heat exchange property when magnetic field intensity is 103Gs when not adding magnetic field and improve about 80%, analyzing reason is because magnetic direction is identical at the axial branch force direction of heat pipe with gravity, the apparent density of heat pipe is along with the increase of magnetic field intensity constantly increases, magnetic fluid is in overweight state, and the heat exchange property of heat pipe constantly increases to make the thermal convection of magnetic fluid inside be strengthened therefore.
Claims (2)
1. the experimental provision of nanometer fluid vacuum adopting heat pipes for heat transfer characteristic under the action of a magnetic field, it is characterized in that: comprise vacuum heat-pipe (1), vacuum heat-pipe is equipped with nano-fluid in (1), the bottom of vacuum heat-pipe (1) is wound with heating wire (17), the outside of heating wire (17) is provided with heat-insulation layer (6), the top of vacuum heat-pipe (1) places condenser pipe (3), condenser pipe (3) is provided with entrance point (9) and endpiece (2), entrance point (9) is through pipeline, flowmeter (10) links to each other with the tank that is positioned at eminence (14), from low tank (13), draw water in the screw clamp (14) with water pump (11), the outside of vacuum heat-pipe (1) is provided with spiral winding (16), spiral winding (16) links to each other with pressure regulator (15), a plurality of thermopairs (8) place vacuum heat-pipe (1) appearance wall from top to bottom, and the output terminal of thermopair (8) links to each other with datalogger (12).
2. the experimental provision of nanometer fluid vacuum adopting heat pipes for heat transfer characteristic under the action of a magnetic field according to claim 1 is characterized in that: described nano-fluid adopts Fe
3O
4Magnetic nanoparticle.
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| CN101581683B true CN101581683B (en) | 2011-07-20 |
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| CN103091363A (en) * | 2013-01-28 | 2013-05-08 | 长沙理工大学 | Device for testing heat exchange performance of solar thermal collector interpolated with nanometer fluid heat pipe |
| CN104569031B (en) * | 2014-12-26 | 2017-06-13 | 广东工业大学 | For the experimental provision and method of nano-fluid directional solidification |
| CN105259208A (en) * | 2015-11-23 | 2016-01-20 | 上海卫星装备研究所 | Heat performance test device and method for heat pipe under vacuum |
| CN107167493A (en) * | 2017-06-02 | 2017-09-15 | 上海大学 | The device of material heat dispersion is measured under additional physical field |
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| CN109297343A (en) * | 2018-09-13 | 2019-02-01 | 中国矿业大学 | A kind of heat-exchange system coupled based on magnetic field with nano-fluid |
| CN111551069A (en) * | 2020-05-20 | 2020-08-18 | 山东大学 | Method, system and application for improving boiling heat exchange efficiency |
| CN112684388B (en) * | 2020-12-10 | 2021-10-15 | 大连理工大学 | Method for measuring medium-high frequency alternating magnetic field intensity based on eddy current effect |
| CN113295730B (en) * | 2021-05-25 | 2022-06-10 | 中国核动力研究设计院 | Fine surface single-phase and two-phase convective heat and mass transfer experimental device and preparation method thereof |
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