CN102183164B - Parallel-connected type pulsating heat pipe taking silver-water nanometer fluid as working medium - Google Patents
Parallel-connected type pulsating heat pipe taking silver-water nanometer fluid as working medium Download PDFInfo
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- CN102183164B CN102183164B CN 201110137496 CN201110137496A CN102183164B CN 102183164 B CN102183164 B CN 102183164B CN 201110137496 CN201110137496 CN 201110137496 CN 201110137496 A CN201110137496 A CN 201110137496A CN 102183164 B CN102183164 B CN 102183164B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/0266—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers
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- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention relates to a parallel-connected type pulsating heat pipe taking silver-water nanometer fluid as a working medium, comprising a plurality of branch pipes which are alternately distributed by a liquid plug and a steam plug and two main pipes which are distributed by a liquid plug and a steam plug. The plurality of branch pipes are connected between the two main pipes by being vertical to the two main pipes, and the plurality of branch pipes are communicated with the two main pipe, wherein one main pipe forms a heating end, and the other main pipe forms a condensing end; the main pipe forming the condensing end is connected with a liquid filling check valve and a three-way valve sequentially through communication pipes, a second port of the three-way valve is connected with a liquid filling port, and a third port of the three-way valve is connected with a pumping port through a pumping check valve; and a liquid working medium filled from the liquid filling port is silver-water nanometer fluid. The parallel-connected type pulsating heat pipe taking silver-water nanometer fluid as the working medium can be started up stably, has good heat transfer and good running state, adopts silver-water nanometer fluid as the working medium, realizes the purposes of reducing the starting power and improving heat transfer upper limit from the aspect of thermophysical properties of the working medium, and has stable running effect.
Description
Technical field
The present invention relates to a kind of pulsating heat pipe.It is low particularly to relate to a kind of starting power, and limit for height is the parallel pulsating heat pipe of working medium with silver-water nano-fluid in the heat transfer.
Background technology
Pulsating heat pipe (pulsating heat pipe) is a kind of new heat pipe, have simple in structure, low cost and other advantages.Propose the nineties in last century by Akachi the earliest, successfully be used for the electronic equipment cooling now.Working medium receives effect of surface tension in the pulsating heat pipe, in conduit, forms vapour, the liquid plug of random distribution.At evaporator section, working medium evaporation forms steam bubble, expands rapidly thereupon and boosts, and promote working medium and flow to the cryogenic condensation section, steam bubble condensation and contraction crack, pressure descends.Because two sections exist pressure imbalance between pressure reduction and the adjacent conduit, working medium is Oscillation Flows between evaporator section and condensation segment, thereby realizes the heat transmission.
In numerous parameters that influence the pulsating heat pipe operation characteristic, the selection of working medium is important one type.Many in recent years researchers have carried out broad research in working medium aspect the influence of pulsating heat pipe heat transfer property.Main working medium comprises ultra-pure water (or distilled water), ethanol, acetone, contains the fluid of copper nano particles etc.For ethanol and acetone, the relative water of their starting power is lower, but heat transport limitation is not high, but and relative ethanol of the heat transport limitation of water and the higher starting power of acetone are also high.Chinese patent ZL200710026286.0 has introduced and adopted microcapsule phase-change thermal storage fluid is the pulsating heat pipe formula heat sink of working medium.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of and can realize the reduction starting power from the angle of hot working fluid rerum natura, improves the heat transfer upper limit, and operational effect stable be the parallel pulsating heat pipe of working medium with silver-water nano-fluid.
The technical scheme that the present invention adopted is: a kind of is the parallel pulsating heat pipe of working medium with silver-water nano-fluid; Include many arms that distribute alternately by liquid plug and steam binding and two house stewards that distribute alternately by liquid plug and steam binding; Described many arms and two perpendicular being connected between two house stewards of house steward are interconnected between described many arms and two house stewards, wherein; Article one, house steward constitutes fire end; Another house steward constitutes condensation end, and the house steward of described formation condensation end goes up through communicating pipe connecting topping up stop valve and triple valve successively, and second port of said triple valve connects implementation of port; The 3rd port of said triple valve connects bleeding point through the stop valve of bleeding, and is silver-water nano-fluid from the liquid working substance that implementation of port charged into.
The house steward of described formation condensation end goes up through communicating pipe connecting vacuum meter.
Described many arms and two house stewards' caliber satisfies:
In the formula, σ is the working medium surface tension, ρ
LipBe the density of liquid phase of working medium, ρ
VapBe the density of gas phase of working medium, D is a caliber.Described many arms and two house stewards adopt copper capillary.
Adopt the twin-stage rotary-vane vaccum pump to vacuumize through bleeding point.
Of the present invention is the parallel pulsating heat pipe of working medium with silver-water nano-fluid, and vertically under the situation, heating power is that 63.5W just can stablize startup, and the heat transfer upper limit can reach 600W.During with 60 ° of horizontal sextant angles, when heating power is between the 425W-567W time, the hot-side temperature pulsation of pulsating heat pipe is stable, and it is good to conduct heat, and near 80 ℃, rises near 90 ℃.When power rose to 641W, the hot junction had a thermocouple to begin to be warming up to suddenly near 115 ℃, hot-spot occurs, along with heating power is that 695W rises to 120 ℃, but wall surface temperature still under the condition of high temperature, pulse, running status is stable.The present invention adopts silver-water nano-fluid as working medium, has realized the reduction starting power from the angle of hot working fluid rerum natura, improves the heat transfer upper limit, and stable effect.
Description of drawings
Fig. 1 is to be the parallel pulsating heat pipe structural representation of working medium with silver-water nano-fluid;
It when Fig. 2 is heating power 63.25W is working medium hot-side temperature change curve when starting with water;
Fig. 3 is that heating power is that 104.3W is working medium hot-side temperature change curve when starting with water;
Fig. 4 is the change curve of heating power wall surface temperature when starting for the 61.56W nano-fluid;
Fig. 5 is that employing water is the hot-side temperature curve of working medium under vertical state high power;
Fig. 6 is that the employing nano-fluid is the hot junction samming curve of working medium under vertical state high power;
Adopting water when Fig. 7 is 60 ° at inclination angle is the hot-side temperature curve of working medium under high power;
Adopting nano-fluid when Fig. 8 is 60 ° at inclination angle is the hot-side temperature curve of working medium under high power.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing to of the present invention be that the parallel pulsating heat pipe of working medium is made detailed description with silver-water nano-fluid.
As shown in Figure 1, of the present invention is the parallel pulsating heat pipe of working medium with silver-water nano-fluid, includes many arms 2 that distributed alternately by liquid plug 10 and steam binding 11 and two house stewards 1 that distributed alternately by liquid plug 10 and steam binding 11; Described many arms 2 and two house steward's 1 perpendicular being connected between two house stewards 1; Be interconnected between described many arms 2 and two house stewards 1, wherein, a house steward 1 constitutes fire end 9; Another house steward 1 constitutes condensation end 8; It is characterized in that through connecting topping up stop valve 5 and triple valve 3 communicating pipe successively, second port of said triple valve 3 connects implementation of port 6 on the house steward 1 of described formation condensation end 8; The 3rd port of said triple valve 3 connects bleeding point 7 through the stop valve 4 of bleeding, and the liquid working substance that is charged into from implementation of port 6 is silver-water nano-fluid.Also connect vacuum meter 12 on the house steward 1 of described formation condensation end 8 through communicating pipe.
Described many arms 2 and two house stewards' 1 caliber satisfies:
In the formula, σ is the working medium surface tension, ρ
LipBe the density of liquid phase of working medium, ρ
VapBe the density of gas phase of working medium, D is a caliber.
Adopt the twin-stage rotary-vane vaccum pump of vacuum high (can the absolute pressure of system be evacuated to 0.2Pa) to vacuumize through bleeding point 7; Carry out filling of working medium through implementation of port 6, realize pipeline and extraneous break-make through bleeding regulating stop valve 4 and topping up stop valve 5.
Of the present invention is the parallel pulsating heat pipe of working medium with silver-water nano-fluid, at first selects for use distilled water as working medium, confirms to select for use the caliber scope at 1.73～4.54mm according to formula (1), selects copper capillary for use according to the intermiscibility principle.
Make silver-parallel pulsating heat pipe of water nano-fluid with copper capillary, carry out Study on Heat Transfer, the experiment test condition is provided according to structure shown in Figure 1.Open bleed stop valve 4 and topping up stop valve 5 earlier; Adopt twin-stage rotary-vane vaccum pump (can the absolute pressure of system be evacuated to 0.2Pa) to vacuumize through bleeding point 6; Observe the registration of vacuum meter, close the stop valve 4 of bleeding when vacuum requires, close vavuum pump when reaching.Can show that through vacuum meter 12 the operating real-time pressure of initial depression and system changes.Charge into working medium through implementation of port 6 then, close topping up stop valve 5.
Uniform winding is surrounded by the nickel chromium triangle heater strip of insulating glass silk on the house steward 1 of fire end 8, realizes evenly heating, and voltmeter and ammeter monitoring heating power are installed.At condensation end 7 cooling water tank is housed, cools off through the waters.Evenly arrange temperature point respectively at fire end 8 and condensation end 7, the temperature realization monitoring in real time to hot junction and cold junction is provided with measuring point 111,112,113,114 and 115 (not shown in figure 1)s at fire end.
Below, through under identical thermal technology's condition, experimentizing, compare as the parallel pulsating heat pipe performance of working medium adopting distilled water and silver-water nano-fluid.
Experiment 1: the selection work medium is that distilled water and mass concentration are silver-water nano-fluid of 0.05%, and liquid filled ratio is 35%, vertically under the state startup of the low parallel pulsating heat pipe of heating power is studied.
As shown in Figure 2, when adopting water to be 63.25W as the working medium heating power, it is violent that the thermocouple measuring point (111,112,113,114 and 115) that the hot junction is evenly arranged shows that wall surface temperature changes, and pulsating heat pipe can not be stablized startup, and the temperature fluctuation scope is up to 20 ℃.As shown in Figure 3, when heating power is that 104.3W starts pulsating heat pipe, the hot-side temperature situation of change is greatly improved.Originally pulsation is more even within 0-900s, but 900s has two temperature points to begin to occur significantly vibration later on, and the operation of this explanation pulsating heat pipe this moment is still unstable.Fig. 4 shows, when heating power is 61.56W, is that the pulsating heat pipe of working medium can normal and stable start with silver-water nano-fluid, and the temperature point that is evenly arranged in the hot junction shows that ripple amplitude is less, about 5 ℃ of crest amplitude.Comprehensive last figure explanation, adopting silver-water nano-fluid is that working medium can effectively reduce starting power.
Experiment 2: the selection work medium is that distilled water and mass concentration are silver-water nano-fluid of 0.05%, and liquid filled ratio is 35%, vertically under the state heat transfer upper limit of the parallel pulsating heat pipe of different heating power is studied.
Can know that from Fig. 5 when the about 416W of heating power, adopt water can reach 90 ℃ as the hot-side temperature of working medium, continuation raising heating power the part occurred and dryouied state.Can know from Fig. 6, adopt nano-fluid as working medium, pulse near 80 ℃ near the hot junction samming 427W, pulsating heat pipe normally moves, and does not exist the part to dryout.And through experiment confirm, when heating power during up to 600W, pulsating heat pipe can move heat transfer, and can there be superheating phenomenon in the part.
Experiment 3: the selection work medium is that distilled water and mass concentration are silver-water nano-fluid of 0.05%, and liquid filled ratio is 35%, is under 60 ° of states the heat transfer upper limit of the parallel pulsating heat pipe of different heating power to be studied with horizontal sextant angle.
Can know from Fig. 7; Operating condition was unstable when pulsating heat pipe had the inclination angle under low liquid filled ratio, can't stable operation during for 275W when heating power, and wall surface temperature changed violent when heating power was 423W; Continuation rising along with heating power can not realize effective pulsation.Can know that from Fig. 8 when heating power is between the 425W-567W time, the hot-side temperature pulsation of pulsating heat pipe is stable, it is good to conduct heat, and near 80 ℃, rises near 90 ℃.When power rose to 641W, the hot junction had a thermocouple to begin to be warming up to suddenly near 115 ℃, hot-spot occurs, along with heating power is that 695W rises to 120 ℃, but wall surface temperature still under the condition of high temperature, pulse, running status is better.Comprehensive above explanation, the nano-fluid pulsating heat pipe can effectively improve the heat transfer upper limit when the inclination angle operation is arranged.
Claims (5)
1. one kind is the parallel pulsating heat pipe of working medium with silver-water nano-fluid; Include many arms (2) that distribute alternately by liquid plug (10) and steam binding (11) and two house stewards (1) that distribute alternately by liquid plug (10) and steam binding (11); What described many arms (2) were vertical is connected between two house stewards (1); Be interconnected between described many arms (2) and two house stewards (1), wherein, a house steward (1) constitutes fire end (9); Another house steward (1) constitutes condensation end (8); It is characterized in that the house steward (1) of described formation condensation end (8) goes up through connecting topping up stop valve (5) and triple valve (3) communicating pipe successively, second port of said triple valve (3) connects implementation of port (6); The 3rd port of said triple valve (3) connects bleeding point (7) through the stop valve of bleeding (4), and the liquid working substance that is charged into from implementation of port (6) is silver-water nano-fluid.
2. according to claim 1 is the parallel pulsating heat pipe of working medium with silver-water nano-fluid, it is characterized in that, that house steward (1) of described formation condensation end (8) goes up through second communicating pipe connecting vacuum meter (12).
3. according to claim 1 is the parallel pulsating heat pipe of working medium with silver-water nano-fluid, it is characterized in that, described many arms (2) and two house stewards' (1) caliber all satisfies:
In the formula, σ is the working medium surface tension, ρ
LipBe the density of liquid phase of working medium, ρ
VapBe the density of gas phase of working medium, D is a caliber.
4. according to claim 1 is the parallel pulsating heat pipe of working medium with silver-water nano-fluid, it is characterized in that, described many arms (2) and two house stewards (1) adopt copper capillary.
5. according to claim 1 is the parallel pulsating heat pipe of working medium with silver-water nano-fluid, it is characterized in that, adopts the twin-stage rotary-vane vaccum pump to vacuumize through bleeding point (7).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102425966B (en) * | 2011-09-23 | 2013-03-13 | 江苏大学 | Manufacturing method of nanoemulsion pulsating heat pipe |
| CN104792200A (en) * | 2015-04-17 | 2015-07-22 | 浙江大学 | Pulsating heat pipe heat exchanger with lyophilic coatings |
| CN108359414B (en) * | 2018-03-08 | 2020-11-03 | 济南大学 | GO and spherical silver nanoparticle composite alcohol-based nanofluid and preparation method thereof |
| CN108413399B (en) * | 2018-03-27 | 2019-04-09 | 山东交通学院 | A kind of burner |
| CN109163458A (en) * | 2018-07-09 | 2019-01-08 | 北京师范大学附属实验中学 | It is a kind of to utilize pulsating heat pipe and nano particle efficient absorption solar device |
| CN108709446B (en) * | 2018-07-25 | 2023-04-25 | 内蒙古工业大学 | Movable latent heat-sensible heat-latent heat gradient phase change rapid heat storage and energy storage device |
| CN110472352B (en) * | 2019-08-20 | 2022-10-25 | 大连海事大学 | Method for designing starting critical pipe diameter of pulsating heat pipe in vertical state |
| US20220299458A1 (en) * | 2019-08-20 | 2022-09-22 | Dalian Maritime University | Liquid metal high-temperature oscillating heat pipe and testing method |
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