Analysis of heat transfer of loop heat pipe used to cool high power LED

2009 ◽  
Vol 52 (12) ◽  
pp. 3527-3532 ◽  
Author(s):  
XiangYou Lu ◽  
ZeZhao Hua ◽  
MeiJing Liu ◽  
YuanXia Cheng
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
High Power ◽  
Loop Heat Pipe ◽  
High Power Led

scholarly journals Development of High-power LED Lighting Luminaires Using Loop Heat Pipe

2008 ◽  
Vol 32 (2) ◽  
pp. 148-155 ◽  
Author(s):  
Bin-Juine HUANG ◽  
Huan-Hsiang HUANG ◽  
Chun-Wei CHEN ◽  
Min-Sheng WU
Keyword(s):  
Heat Pipe ◽  
High Power ◽  
Loop Heat Pipe ◽  
Led Lighting ◽  
High Power Led

Thermal analysis of loop heat pipe used for high-power LED

2009 ◽  
Vol 493 (1-2) ◽  
pp. 25-29 ◽  
Author(s):  
Xiang-you Lu ◽  
Tse-Chao Hua ◽  
Mei-jing Liu ◽  
Yuan-xia Cheng
Keyword(s):  
Thermal Analysis ◽  
Heat Pipe ◽  
High Power ◽  
Loop Heat Pipe ◽  
High Power Led

Improve the Performance of Micro Heat Pipe by Surface Modification

2017 ◽  
Vol 868 ◽  
pp. 21-26
Author(s):  
Yi Luo ◽  
Si Di Li ◽  
Zi Cheng Yu ◽  
Xiao Dong Wang
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
High Power ◽  
High Heat ◽  
Cover Plate ◽  
Working Fluid ◽  
High Heat Flux ◽  
Glass Cover ◽  
Micro Heat Pipe ◽  
High Power Led

The appearance of high power LED has put forward higher requirements for thermal management. The micro heat pipe (MHP) has high heat transfer ability and plays an important role in high power LED and other high heat flux device cooling. In this paper, we designed and fabricated a micro heat pipe with fluoroalkyl silane (FAS) surface modified glass cover. The contact angle of the working area of glass cover reached 95.49° and made working fluid drops fall back to micro groove of silicon substrate more quickly. Thus the new glass cover can speed up the circulation of working fluid and enhance the heat transfer. The experimental results also proved that hydrophobic glass cover has a better heat transfer capability. Besides, this novel MHP reached the stable working status faster. When the input heat power was 10 W, the balance temperature of MHP with hydrophobic glass cover was 22 oC lower than traditional MHP, while the balance time is 58 seconds less. The work presented in this paper provides a new direction for optimize the MHP, not only the wick structure in substrate, but also the wettability of cover plate.

Experimental study of heat transfer and start-up of loop heat pipe with multiscale porous wicks

2017 ◽  
Vol 117 ◽  
pp. 782-798 ◽  
Author(s):  
Xianbing Ji ◽  
Ye Wang ◽  
Jinliang Xu ◽  
Yanping Huang
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Heat Pipe ◽  
Loop Heat Pipe ◽  
Start Up

Effect of Sintering Temperature Curve in Wick Manufactured for Loop Heat Pipe with Flat Evaporator

2014 ◽  
Vol 595 ◽  
pp. 24-29 ◽  
Author(s):  
Shen Chun Wu ◽  
Kuei Chi Lo ◽  
Jia Ruei Chen ◽  
Chen Yu Chung ◽  
Weie Jhih Lin ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
Heat Transfer Performance ◽  
Sintering Temperature ◽  
Temperature Curve ◽  
Loop Heat Pipe ◽  
Transfer Performance ◽  
Total Thermal Resistance ◽  
Flat Evaporator ◽  
Increasing Temperature

This paper specifically addresses the effect of the sintering temperature curve in manufacturing nickel powder capillary structure (wick) for a loop heat pipe (LHP) with flat evaporator. The sintering temperature curve is composed of three regions: a region of increasing temperature, a region of constant temperature, and a region of decreasing temperature. The most important region is the increasing temperature region, as the rate of temperature increase directly affects the performance of the wick.When the slope of the region of increasing temperature is 0.8 (equivalent to 8 OC/min), the structure of the manufactured wick is complete, with the best heat transfer performance result. Experimental resultsshowed that the optimal heat transfer performance is 160W, the minimal total thermal resistance is approximately 0.43OC/W, and the heat flux is 17W/cm2; the optimal wick manufactured has an effective pore radius of 5.2 μm, a permeability of 5.9×10-13m2, and a porosity of 64%.

scholarly journals Design of an experimental device for preheating combustion air

2021 ◽  
Vol 345 ◽  
pp. 00021
Author(s):  
Lucia Martvoňová ◽  
Mária Polačiková ◽  
Juraj Drga ◽  
Alexander Backa
Keyword(s):  
Heat Transfer ◽  
Phase Transformation ◽  
Heat Source ◽  
Heat Pipe ◽  
Waste Heat ◽  
Experimental Device ◽  
Loop Heat Pipe ◽  
Air Supply ◽  
Working Medium

The principle of the proposed device is to use part of the waste heat, which otherwise leaves through the chimney unused into the air, to preheat the combustion air. reducing chimney losses and preheating the combustion air will increase the efficiency of the heat source. the device is actually a gravity loop heat pipe with an evaporating part located behind the furnace and a condensing part in the combustion air supply duct. Heat transfer is realized by means of phase transformation of the working medium in the proposed device.

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