Thermal performance and capillary limit of a ceramic wick applied to LHP and CPL

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• 作者：Paulo H.D. Santos^a ; ^{paulosantos@labcet.ufsc.br} ; Edson Bazzo^b ; Amir A.M. Oliveira^b
• 关键词：Ceramic wick ; LHP ; CPL
• 刊名：Applied Thermal Engineering
• 出版年：2012
• 期刊代码：8_13594311
• 类别：ce
• 出版时间：August, 2012
• 卷：41
• 期：Complete
• 页码：92-103
• 文件大小：1540 K

摘要

The performance of a ceramic wick working as a capillary evaporator of a Loop Heat Pipe (LHP) and a Capillary Pumped Loop (CPL) is analyzed. The LHP and the CPL have a capillary evaporator with 10聽mm of inner diameter and 25聽mm of length. The LHP compensation chamber has the same diameter as the evaporator and a length of 50聽mm. The ceramic wick was sintered from alumina and mullite powders, achieving 50%of porosity, 1-3聽渭m pore size distribution and permeability of 35聽脳聽10^鈭?5聽m², and then machined to properly fit the evaporators. The performance tests were carried out using deionized water as the working fluid for power inputs of up to 30聽W. The thermal performance, capillary limit and area-specific thermal resistance of these systems were analyzed with the support of basic heat transfer and fluid flow lumped models. The lowest area-specific thermal resistance values of 31.7聽掳C/W/cm² for CPL and 25.0聽掳C/W/cm² for LHP were reached when dissipating 3.18聽W/cm², while the highest values of 52.8聽掳C/W/cm² for CPL and 38.8聽掳C/W/cm² for LHP were reached while dissipating 0.53聽W/cm² and 1.06聽W/cm², respectively. The analysis shows that the systems operate well at their capillary limit and their performance is equivalent to similar devices operating with acetone and ammonia reported in the literature.