金属泡沫–水的自然对流换热实验研究
Experimental Investigation of Natural Convection in Metal Foam-Water

DOI: 10.12677/APF.2016.61001, PP. 1-8

Keywords: 金属泡沫–水，自然对流，温差，孔密度
Metal Foam-Water, Natural Convection, Difference of Temperature, Pore Density

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Abstract:

本文针对多孔介质材料中的自然对流换热问题，通过搭建充满金属泡沫–水的实验装置，探究了金属泡沫–水自然对流换热机理，讨论了加热功率、箱体倾斜角度对方腔内金属泡沫-水两相自然对流换热的影响，实验发现努谢尔数Nu随加热功率的增加而变大，随着倾斜角度的增大而变小，随着金属泡沫孔密度PPI的增大而减小。最终得到了箱体水平放置时5 PPI和10 PPI努谢尔数Nu随瑞利数Ra的变化规律。
In this paper, an experiment apparatus filled with metal foam-water is set up to investigate the problem of natural convection about porous medium. A mechanism of natural convection of metal foam-water is investigated by experiments. Influences of heating power and angle of inclination on natural convection in the cavity filled with metal foam-water are discussed. It is found that the Nusselt number increases with heating power and decreases with the angle of inclination and pore density PPI of metal foam. A correlation of Nusselt number and Raleigh number is obtained when the cavity is horizontal with 5 PPI and 10 PPI.

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