科研之友
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摘要
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 LID 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.
- 出版日期2014
- 单位中南大学
