Thermal Analysis of Closed Loop Pulsating Heat Pipe

Thermal Analysis of Closed Loop Pulsating Heat Pipe

迦文西(Ramesh Uppala)

指導教授 ： 陳炳煇

國立臺灣大學/工學院/機械工程學研究所/碩士(2004年)

https://doi.org/10.6342/NTU.2004.01584

摘要

無資料

關鍵字

脈衝熱管 ； 兩相流 ； 電子散熱 ； 流場分析

並列摘要

This study aims to flow visualization and thermal analysis of a closed loop pulsating heat pipe based on inclination angle, charging ratio, type of fluid and heat flux for thermal control of micro electronic equipments. Although a variety of designs are in use, understanding of the fundamental processes and parameters affecting the PHP operation are still vague. A vertical, closed loop, glass PHP with water, methanol and 2-propanol as working fluids is first experimentally investigated for a range of heat inputs, inclination angles and charging ratios. Experimental studies are performed on a PHP, consisting of a heating section, an adiabatic section and a condensation section incorporating heat sink. The capillary tube used in this study has an inside diameter of 2mm and a wall thickness of 3mm.Total length of the pulsating heat pipe is 350cm. The experiments are conducted under forced convection cooling at the condenser section, with heating powers from 10 to 110W, with different heating modes (locations) and charging ratios from 30% to 80%. The experimental results show that the system presented better performance when operating at vertical orientation. Optimal charging ratio is 50% for DI water, 40% for methanol and 40% for 2-propanol. Regarding working fluid the PHP shows better performance when Methanol is used in vertical orientation with the lowest evaporator section temperatures.

並列關鍵字

Pulsating heat pipe ； Two-phase loop ； Electronic cooling ； Flow pattern

參考文獻

Akachi, H., 1990, “Structure of a Heat Pipe”, No. 4,921,041, US Patent.

Cotter, T.P., 1964, “Theory of Heat Pipes,” Los Alamos National Laboratory Report No. LA-3246-MS, University of California, Los Alamos, NM.

Casarosa, C., Latrofa, E., and Shelginski, A., 1983, “The geyser effect in a two-phase thermosyphons,” International Journal of Heat and mass Transfer, Vol.26, pp.933-941.

Charoensawan, P., Khandekar, S., Groll, M., and Terdtoon, P., 2003, “Closed loop pulsating heat pipes-Part A: Parametric experimental investigations,” Applied Thermal Engineering, Vol.23, pp.2009-2020.

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