Experimental observation of thermal behavior of a loop heat pipe with a bypass line under high heat flux

Energy ◽  
2020 ◽  
Vol 197 ◽  
pp. 117241 ◽  
Author(s):  
Eui Guk Jung ◽  
Joon Hong Boo
Keyword(s):  
Heat Flux ◽  
Thermal Behavior ◽  
Heat Pipe ◽  
Experimental Observation ◽  
High Heat ◽  
High Heat Flux ◽  
Loop Heat Pipe ◽  
Bypass Line

scholarly journals Development of a Miniature Loop Heat Pipe for High Heat Flux Devices and Evaluation of Its Heat Transport Performance

2021 ◽  
Vol 35 (1) ◽  
pp. 150-158
Author(s):  
Noriyuki WATANABE ◽  
Takuji MIZUTANI ◽  
Masatoshi KAKUE ◽  
Hiroshi NISHIKAWA ◽  
Takahiro TAKADA ◽  
...  
Keyword(s):  
Heat Flux ◽  
Heat Pipe ◽  
Heat Transport ◽  
High Heat ◽  
High Heat Flux ◽  
Loop Heat Pipe

Development of hybrid loop heat pipe using pump assistance for cooling application on high heat flux device

2019 ◽  
Vol 33 (8) ◽  
pp. 3685-3694
Author(s):  
Iwan Setyawan ◽  
Nandy Putra ◽  
Imansyah Ibnu Hakim ◽  
Ridho Irwansyah
Keyword(s):  
Heat Flux ◽  
Heat Pipe ◽  
High Heat ◽  
High Heat Flux ◽  
Loop Heat Pipe

scholarly journals Experimental Study on Thermal Performance of a Bent Copper-Water Heat Pipe

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Shuangshuang Miao ◽  
Jiajia Sui ◽  
Yulong Zhang ◽  
Feng Yao ◽  
Xiangdong Liu
Keyword(s):  
Heat Flux ◽  
Heat Pipe ◽  
Critical Heat Flux ◽  
Working Conditions ◽  
Thermal Performance ◽  
Heat Input ◽  
High Heat ◽  
High Heat Flux ◽  
Electronic Components ◽  
Copper Water

Vapor-liquid phase change is regarded as an efficient cooling method for high-heat-flux electronic components. The copper-water bent heat pipes are particularly suited to the circumstances of confined space or misplaced heat and cold sources for high-heat-flux electronic components. In this paper, the steady and transient thermal performance of a bent copper-water heat pipe is studied based on a performance test system. The effects of cooling temperature, working conditions on the critical heat flux, and equivalent thermal conductivity have been examined and analyzed. Moreover, the influences of heat input and working conditions on the thermal response of a bent heat pipe have also been discussed. The results indicate that the critical heat flux is enhanced due to the increases in cooling temperature and the lengths of the evaporator and condenser. In addition, the critical heat flux is improved by extending the cooling length only when the operating temperature is higher than 50°C. The improvement on the equivalent thermal by increasing the heating length is more evident than that by increasing cooling length. It is also demonstrated by the experiment that the bent copper-water heat pipe can respond quickly to the variation of heat input and possesses superior transient heat transfer performance.

Working Fluid Inventory Effect on Heat Transfer Performance of a Grooved Micro Heat Pipe

2013 ◽  
Vol 589-590 ◽  
pp. 559-564
Author(s):  
Xi Bing Li ◽  
Yun Shi Ma ◽  
Xun Wang ◽  
Ming Li
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Heat Pipe ◽  
Heat Transfer Performance ◽  
Mathematic Model ◽  
High Heat ◽  
Working Fluid ◽  
High Heat Flux ◽  
Transfer Performance ◽  
Flux Concentration

As a highly efficient heat transfer component, a micro heat pipe (MHP) has been widely applied to the situations with high heat flux concentration. However, a MHPs heat transfer performance is affected by many factors, among which, working fluid inventory has great influence on the security, reliability and frost resistance of its heat transfer performance. In order to determine the appropriate working fluid inventory for grooved MHPs, this paper first analyzed the working principle, major heat transfer limits and heat flux distribution law of grooved MHPs in electronic chips with high heat flux concentration, then established a mathematic model for the working fluid inventory in grooved MHPs. Finally, with distilled water being the working fluid, a series of experimental investigations were conducted at different temperatures to test the heat transfer performances of grooved MHPs, which were perfused with different inventories and with different adiabatic section lengths. The experimental results show that when the value of α is roughly within 0.40±0.05, a grooved MHP can acquire its best heat transfer performance, and the working fluid inventory can be determined by the proposed mathematic model. Therefore this study solves the complicated problem of determining appropriate working fluid inventory for grooved MHPs.

scholarly journals Visualization Experimental Study on Silicon-Based Ultra-Thin Loop Heat Pipe Using Deionized Water as Working Fluid

Micromachines ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1080
Author(s):  
Wenzhe Song ◽  
Yanfeng Xu ◽  
Lihong Xue ◽  
Huajie Li ◽  
Chunsheng Guo
Keyword(s):  
Heat Pipe ◽  
Heat Dissipation ◽  
Experimental System ◽  
High Heat ◽  
Deionized Water ◽  
Working Fluid ◽  
Stable Operation ◽  
High Heat Flux ◽  
Loop Heat Pipe ◽  
Silicon Based

As a type of micro flat loop heat pipe, s-UTLHP (silicon-based ultra-thin loop heat pipe) is of great significance in the field of micro-scale heat dissipation. To prove the feasibility of s-UTLHP with high heat flux in a narrow space, it is necessary to study its heat transfer mechanism visually. In this paper, a structural design of s-UTLHP was proposed, and then, to realize the working fluid charging and visual experiment, an experimental system including a holding module, heating module, cooling module, data acquisition module, and vacuum chamber was proposed. Deionized water was selected as a working fluid in the experiment. The overall and micro phenomena of s-UTLHP during startup, as well as the evaporation and condensation phenomena of s-UTLHP during stable operation, were observed and analyzed. Finally, the failure phenomenon of s-UTLHP was analyzed, and several solutions were proposed. The observed phenomena and experimental conclusions can provide references for further related experimental research.

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