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Journal of Porous Media
Fator do impacto: 1.752 FI de cinco anos: 1.487 SJR: 0.43 SNIP: 0.762 CiteScore™: 2.3

ISSN Imprimir: 1091-028X
ISSN On-line: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.v17.i9.50
pages 811-818

A SIMPLE AND EFFECTIVE METHOD TO DIRECTLY MEASURE THE CAPILLARY PRESSURE OF A POROUS WICK

Dezhi Wang
Key Laboratory of Ministry of Education for Non-Ferrous Materials Science and Engineering, School of Materials Science and Engineering, Central South University, Changsha 410083, China
Xiaoying Wang
Key Laboratory of Ministry of Education for Non-Ferrous Materials Science and Engineering, School of Materials Science and Engineering, Central South University, Changsha 410083, China
Dandan Liang
Key Laboratory of Ministry of Education for Non-Ferrous Materials Science and Engineering, School of Materials Science and Engineering, Central South University, Changsha 410083, China
Bohua Duan
Key Laboratory of Ministry of Education for Non-Ferrous Materials Science and Engineering, School of Materials Science and Engineering, Central South University, Changsha 410083, China
Zhuangzhi Wu
Key Laboratory of Ministry of Education for Non-Ferrous Materials Science and Engineering, School of Materials Science and Engineering, Central South University, Changsha 410083, China
Chao Wang
Shanghai Institute of Spacecraft Equipment, Hua Ning Road 251, Shanghai 200245, China

RESUMO

A simple and effective method that establishes the relationship between capillary pressure and real-time pumping amount of working fluid was put forward to directly calculate the capillary pressure of a porous wick with large L/D ratio (>5). An improved apparatus was designed to measure the permeability of the porous wick. Four porous wicks with different porosities were studied. The porous wicks were prepared by a powder metallurgy method with carbonyl nickel powders as the materials. The results show that there is no direct relationship between the permeability and the length of the porous wick. The sealing tapes prevent the seepage and evaporation of working fluid, which may result in erroneous readings. The experimental curve of the real-time capillary pumping amount deviates from the theoretical curve, which is a parabola. Compared with other methods, the results obtained in the present methods are closer to the capillary pressures in practical applications. Therefore this method to directly measure the capillary pressure of a cylindrical porous wick is simple and effective. Additionally, the improved apparatus can be used to measure permeability and is very helpful in the design of loop heat pipes.


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