CN102573422A - Method for enhancing heat exchange of free surface array jet system - Google Patents
Method for enhancing heat exchange of free surface array jet system Download PDFInfo
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- CN102573422A CN102573422A CN2012100123375A CN201210012337A CN102573422A CN 102573422 A CN102573422 A CN 102573422A CN 2012100123375 A CN2012100123375 A CN 2012100123375A CN 201210012337 A CN201210012337 A CN 201210012337A CN 102573422 A CN102573422 A CN 102573422A
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Abstract
Aiming at the problems of lower heat exchange performance and the like in the existing array jet technology, the invention provides a method capable of being applied to heat dissipation of electronic devices under a condition of high heating flux, so the heat dissipation capability of the electronic devices is improved and safe operation of the electronic devices is guaranteed. The method is characterized in that nano-fluid with high heat-conducting property is led into a free surface array jet system; and by selecting the metal/metal oxide nano-fluid with the high heat-conducting property and utilizing the high heat-conducting property and a heat exchange enhancing effect of the nano-fluid, the heat exchange capability of the array jet system is effectively improved and thereby a higher heat exchange effect is obtained. Compared with the prior art, the method has the remarkable advantages that 1, the nano-fluid used as an experimental working medium has higher heat-conducting property than an ordinary working medium; 2, random motion of nano-particles in the nano-fluid is beneficial to heat transfer in the fluid, so the improvement of the uniformity of surface temperature of a heating body can be benefited; and 3, a heat exchange surface is impacted by the nano-particles in the nano-fluid, so the heat exchange capability of the free surface array jet system is improved.
Description
Technical field
The invention belongs to the electronic device heat control method, the high thermal conductivity nano-fluid is introduced in the Free Surface array jetting, thereby effectively strengthened array jetting heat exchange effect.
Background technology
The principle of jet impulse cooling is: fluid is directly injected to the surface that is cooled through the nozzle (circle or slit shape) of definite shape; Because flow process is short, flow velocity is high, on heat exchange surface, forms very big pressure; Near the jet impulse stagnation region boundary layer becomes very thin; Thereby have high heat exchange efficiency, than the heat convection technology of routine, the impingement heat transfer coefficient of jet cooling technology is wanted high several times or even an one magnitude.Documents 1 (Fabbri Metteo; Dhir Vijay K.; Optimized heat transfer for high power electronic cooling using arrays of microjets; 127 (2005): the heat-sinking capability of array jetting of 760-769.) having utilized micro-hole array experimental study proves that array jetting is a kind of very effectively dissipation from electronic devices method.But a large amount of uses of experimental study at present is the working medium of low heat conductivity ability, be water like The working fluid in the documents 1, and the working medium of high thermal conductivity must be brought higher heat exchange property.
Since nano-fluid (documents 2 Choi S U S; Enhancing thermal conductivity of fluids with nano-particles. American Society of Mechanical Engineering; 231 (1995): 992103.) be suggested after; The various countries scholar studies its capacity of heat transmission, viscosity etc., and research has proved that nano-fluid contributes enhanced heat exchange, but does not have the people that array jetting and nano-fluid are combined; Thereby strengthen the heat exchange property of array jetting, be the heat radiation raising effective technical support of following high-power electric appliance.
This method is introduced nano-fluid in the Free Surface array jetting; The high capacity of heat transmission of nano-fluid and the invigoration effect and the high heat convection performance of Free Surface array jetting of heat exchanging are combined; Effectively improved the impingement heat transfer ability of array jetting; Thereby more effectively satisfy the more radiating requirements of high heat flux electronic device, effectively control the surface temperature of electronic device, satisfy the working temperature demand of following high-power electronic device.
Summary of the invention
The objective of the invention is to having problems such as heat exchange property is lower in the existing array jetting technology; A kind of method that can be applied to dissipation from electronic devices under the high heat flux condition is provided; Improve the heat-sinking capability of electronic device, guaranteed the safe operation of electronic device.
The nano-fluid of high thermal conductivity is introduced in the Free Surface array jetting; Select the metal/metal oxide nano-fluid of high thermal conductivity; Utilize the high thermal conductivity and the enhanced heat exchange effect of nano-fluid, effectively improve the exchange capability of heat of array jetting system, thereby obtain higher heat exchange effect.
Realize that technical solution of the present invention is:
A kind of method of strengthening the heat exchange of Free Surface array jetting comprises following concrete steps:
(1) selects nano particle with high thermal conductivity and high dispersive performance;
(2) preparation nano-fluid;
(3) optimize Free Surface array jetting system;
(4) nano-fluid for preparing is added Free Surface array jetting system, regulate operational environment, carry out the heat exchange of Free Surface array jetting.
The nano particle of described high thermal conductivity of (1) step and high dispersive performance is the metal/metal oxide nano particle, preferably copper, aluminium or its oxide.
Described nano-fluid of (2) step adopts classical two-step method preparation, and the concentration of described nano-fluid is 0.17-1.34Vol.%.
Described optimization array jetting system was and optimized the heat transmission equipment body (3) step; It is 3-10 that the optimization of heat exchange body requires adjacent jet orifice interval S and jet orifice diameter D ratio range; Impacting spacing H and jet orifice diameter ratio is 3.5-15, and the jet orifice diameter range is 0.5mm-3.0mm; While heat exchange surface cutting reinforcing heat exchange capability, groove depth h choosing value is 0.5mm-1.5mm, and groove width d choosing value is 0.5mm-2.0mm, and separation p choosing value is 0.5mm-2.0mm.
In (2) step, in order to reach better dispersion effect, adopt neopelex as dispersant, the addition of described neopelex is 0-0.1%.
The present invention compared with prior art, its remarkable advantage is:
1, The working fluid is a nano-fluid, has the higher capacity of heat transmission than common working medium;
2, the random motion of nano particle helps heat in fluid, to transmit in the nano-fluid, will help to improve the uniformity of heater surface temperature;
3, nano particle impingement heat transfer surface in the nano-fluid, the exchange capability of heat of raising Free Surface array jetting.
Description of drawings
Fig. 1 is that the embodiment of the invention 1 nano-fluid is 50W/cm as heat radiation working medium to density of heat flow rate
2Heat exchange surface dispel the heat the experiment the heat exchange design sketch.
Fig. 2 is that the embodiment of the invention 2 nano-fluids are 50W/cm as heat radiation working medium to density of heat flow rate
2Heat exchange surface dispel the heat the experiment the heat exchange design sketch.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
This method is introduced nano-fluid in the Free Surface array jetting, comprises the selection of nano-fluid, Free Surface array jetting environment and condition of work.
Realize that this method mainly shows the selection of nano-fluid and the control of condition of work.(1) selection has copper, aluminium or its oxide nano-particles of high thermal conductivity and high dispersive performance; (2) utilize classical two-step method to prepare the nano-fluid of concentration, investigate the stability of nano-fluid and dispersed, guarantee that prepared nano-fluid can use safely for a long time for 0.17-1.34Vol.%; (3) optimize Free Surface array jetting system; The consolidation system exchange capability of heat; It is 1.5-10 that the optimization of heat exchange body requires adjacent jet orifice interval S and jet orifice diameter D ratio range, and impacting spacing H and jet orifice diameter ratio is 3.5-15, and the jet orifice diameter range is 0.5mm-3.0mm; While heat exchange surface cutting reinforcing heat exchange capability, groove depth h choosing value is 0.5mm-1.5mm, and groove width d choosing value is 0.5mm-2.0mm, and separation p choosing value is 0.5mm-2.0mm; (4) nano-fluid for preparing is added Free Surface array jetting system, regulate operational environment, carry out the heat exchange of Free Surface array jetting.
Embodiment 1
1, measures each 1.5L of ethylene glycol and deionized water, fully mix, process ethylene glycol-aqueous solution of 1:1;
2, take by weighing the metallic copper nano particle of 120g average diameter 50nm; It is added in ethylene glycol-aqueous solution, put it into ultrasonic 4h in the ultrasonic device, carry out mechanical agitation simultaneously; Prepare volume fraction and be copper-ethylene glycol-water nano-fluid of 0.56%, this is that two-step method prepares nano-fluid;
3, optimization system to being incubated processing in the system pipes, is regulated heat transmission equipment, and selecting the jet orifice diameter is 1.5mm, and S/D is 3, and H/D is 7; Surface groove, groove depth 0.5mm, groove width 0.5mm, separation 0.5mm regulates the jet orifice position, guarantees that the array jetting hole is over against the heat exchange surface center;
4, the nano-fluid with preparation adds experimental system, regulates experimental temperature to 15 ℃, heat-exchange working medium flow 0.144m3/h, and the simulation thermal source is heated to 50W/cm2,, the beginning local heat transfer.
Its heat exchange effect is as shown in Figure 1, and nano-fluid is introduced in the Free Surface array jetting, does not compare with using nano-fluid, and system's heat exchange property improves a lot, and the highest lifting amplitude has reached 18.5%, has shown to use the superiority of nano-fluid as working medium.Therefore simultaneously, Fig. 1 has explained that also too high nano particle share may cause the decline of heat exchange property, and selecting suitable nano particle kind and share is unusual The key factor.
Embodiment 2
1, measures deionized water 3L; Take by weighing the metallic copper nano particle of 38g average diameter 25nm; It is added in the deionized water, and the neopelex that adds mass fraction 0.05% simultaneously puts it into ultrasonic 4h in the ultrasonic device as dispersant; Carry out mechanical agitation simultaneously, prepare volume fraction and be copper-water nano-fluid of 0.17%;
2, optimization system to being incubated processing in the system pipes, is regulated heat transmission equipment, and selecting the jet orifice diameter is 3.0mm, and S/D is 1.5, and H/D is 5; Surface groove, groove depth 1.0mm, groove width 0.5mm, separation 0.5mm regulates the jet orifice position, guarantees that the array jetting hole is over against the heat exchange surface center;
3, the nano-fluid with preparation adds experimental system, regulates experimental temperature to 21 ℃, heat-exchange working medium flow 0.22m
3/ h, the simulation thermal source is heated to 49W/cm
2,, the beginning local heat transfer.
Its heat exchange effect is for example as shown in Figure 2; Can draw from Fig. 2; Nano-fluid is introduced in the Free Surface array jetting, do not compared with using nano-fluid, system's heat exchange property improves a lot; The highest lifting amplitude has reached 6.5%, but volume share possibly can't obtain effective invigoration effect when low.Fig. 2 explains that also dispersant can influence the exchange capability of heat of nano-fluid.
Embodiment 3
1, measures deionized water 3L; Take by weighing the copper oxide nano particle of 79g average diameter 50nm; It is added in the deionized water, and the neopelex that adds mass fraction 0.1% simultaneously puts it into ultrasonic 4h in the ultrasonic device as dispersant; Carry out mechanical agitation simultaneously, prepare volume fraction and be cupric oxide-water nano-fluid of 0.33%;
2, optimization system to being incubated processing in the system pipes, is regulated heat transmission equipment, and selecting the jet orifice diameter is 0.5mm, and S/D is 10, and H/D is 15; Surface groove, groove depth 1.5mm, groove width 2.0mm, separation 2.0mm regulates the jet orifice position, guarantees that the array jetting hole is over against the heat exchange surface center;
3, the nano-fluid with preparation adds experimental system, regulates experimental temperature to 20 ℃, heat-exchange working medium flow 0.197m3/h, and the simulation thermal source is heated to 50W/cm2, the beginning local heat transfer.
Utilize said method to carry out local heat transfer, do not compare with using nano-fluid, the highest lifting amplitude of system's heat exchange property has reached 4.3%.
Embodiment 4
1, measures deionized water 3L; Take by weighing the metallic aluminium nano particle of 240g average diameter 50nm; It is added in the deionized water, and the neopelex that adds mass fraction 0.05% simultaneously puts it into ultrasonic 4h in the ultrasonic device as dispersant; Carry out mechanical agitation simultaneously, preparing volume fraction is cupric oxide-water nano-fluid of 1.343 %;
2, optimization system to being incubated processing in the system pipes, is regulated heat transmission equipment, and selecting the jet orifice diameter is 1.5mm, and S/D is 3, and H/D is 7; Surface groove, groove depth 1.0mm, groove width 1.5mm, separation 1.5mm regulates the jet orifice position, guarantees that the array jetting hole is over against the heat exchange surface center;
3, the nano-fluid with preparation adds experimental system, regulates experimental temperature to 20 ℃, heat-exchange working medium flow 0.197m
3/ h, the simulation thermal source is heated to 50W/cm
2, the beginning local heat transfer.
Utilize said method to carry out local heat transfer, do not compare with using nano-fluid, the highest lifting amplitude of system's heat exchange property has reached 8.4%.
Embodiment 5
1, measures deionized water 3L; Take by weighing the aluminium oxide nano particle of 139g average diameter 50nm; It is added in the deionized water, and the neopelex that adds mass fraction 0.05% simultaneously puts it into ultrasonic 4h in the ultrasonic device as dispersant; Carry out mechanical agitation simultaneously, prepare volume fraction and be cupric oxide-water nano-fluid of 0.746%;
2, optimization system to being incubated processing in the system pipes, is regulated heat transmission equipment, and selecting the jet orifice diameter is 1.0mm; S/D is 5, and H/D is 10, surface groove, groove depth 1.5mm; Groove width 1.5mm, separation 1.5mm regulates the jet orifice position, guarantees that the array jetting hole is over against the heat exchange surface center;
3, the nano-fluid with preparation adds experimental system, regulates experimental temperature to 21 ℃, heat-exchange working medium flow 0.172m3/h, and the simulation thermal source is heated to 50W/cm2, the beginning local heat transfer.
Utilize said method to carry out local heat transfer, do not compare with using nano-fluid, the highest lifting amplitude of system's heat exchange property has reached 5.1%.
Claims (5)
1. method of strengthening the heat exchange of Free Surface array jetting is characterized in that said method comprising the steps of:
The nano particle that the 1st step, selection have high thermal conductivity and high dispersive performance;
The 2nd step, preparation nano-fluid;
The 3rd step, optimization Free Surface array jetting system;
The 4th step, the nano-fluid for preparing is added Free Surface array jetting system, regulate operational environment, carry out the heat exchange of Free Surface array jetting.
2. the method for reinforcement Free Surface array jetting according to claim 1 heat exchange is characterized in that the high thermal conductivity described in the 1st step and the nano particle of high dispersive performance are the metal/metal oxide nano particle, preferably copper, aluminium or its oxide.
3. the method for reinforcement Free Surface array jetting according to claim 1 heat exchange is characterized in that the nano-fluid described in the 2nd step adopts classical two-step method preparation, and the concentration of described nano-fluid is 0.17-1.34Vol.%.
4. according to the method for claim 1 or 3 described reinforcement Free Surface array jetting heat exchange, it is characterized in that in the 2nd step preparation nano-fluid process, adopting neopelex as dispersant, the addition of described neopelex is 0-0.1%.
5. the method for reinforcement Free Surface array jetting according to claim 1 heat exchange; It is characterized in that the optimization array jetting system described in the 3rd step is optimization heat transmission equipment body; Requiring adjacent jet orifice interval S and jet orifice diameter D ratio range is 3-10; Impacting spacing H and jet orifice diameter ratio is 3.5-15, and the jet orifice diameter range is 0.5mm-3.0mm; While heat exchange surface cutting reinforcing heat exchange capability, groove depth h choosing value is 0.5mm-1.5mm, and groove width d choosing value is 0.5mm-2.0mm, and separation p choosing value is 0.5mm-2.0mm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102757769A (en) * | 2012-08-03 | 2012-10-31 | 何秋生 | Water-based nano-oxide coolant for cooling high-power central processing unit (CPU) chip and operation system |
| CN107567247A (en) * | 2017-09-07 | 2018-01-09 | 太原理工大学 | A kind of dissipation from electronic devices method that array jetting, solid-liquid phase change are coupled |
| CN116314084A (en) * | 2023-05-24 | 2023-06-23 | 中国人民解放军国防科技大学 | Micro-particle flow heat exchange device based on jet flow exciter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2586694Y (en) * | 2002-11-22 | 2003-11-19 | 罗行 | Nnometer working fluid enclosed type natural circulation heat transmission apparatus |
| CN101231148A (en) * | 2008-02-21 | 2008-07-30 | 上海交通大学 | Round tube type micro-mortise heat tube using carbon nano-tube suspending liquid as working medium |
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2012
- 2012-01-16 CN CN201210012337.5A patent/CN102573422B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2586694Y (en) * | 2002-11-22 | 2003-11-19 | 罗行 | Nnometer working fluid enclosed type natural circulation heat transmission apparatus |
| CN101231148A (en) * | 2008-02-21 | 2008-07-30 | 上海交通大学 | Round tube type micro-mortise heat tube using carbon nano-tube suspending liquid as working medium |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102757769A (en) * | 2012-08-03 | 2012-10-31 | 何秋生 | Water-based nano-oxide coolant for cooling high-power central processing unit (CPU) chip and operation system |
| CN107567247A (en) * | 2017-09-07 | 2018-01-09 | 太原理工大学 | A kind of dissipation from electronic devices method that array jetting, solid-liquid phase change are coupled |
| CN107567247B (en) * | 2017-09-07 | 2019-07-02 | 太原理工大学 | A kind of dissipation from electronic devices method that array jetting, solid-liquid phase change are coupled |
| CN116314084A (en) * | 2023-05-24 | 2023-06-23 | 中国人民解放军国防科技大学 | Micro-particle flow heat exchange device based on jet flow exciter |
| CN116314084B (en) * | 2023-05-24 | 2023-08-04 | 中国人民解放军国防科技大学 | Micro-particle flow heat exchange device based on jet flow exciter |
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