INFLUENCE OF THE POROUS MEDIA ON HEAT EXCHANGE AT FILM BOILING LIQUID

A. Avramenko, M. Kovetskaya, N. P. Dmitrenko, Y. Kovetska
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Abstract

The present work focuses on a study of heat transfer during film boiling of a liquid on a vertical heated wall immersed in a porous medium subject to variation of different parameters of the porous medium and heating conditions at the wall. An analytical solution was obtained for the problem using Darcy-Brinkman-Forchheimer model. It was shown that heat transfer intensity during film boiling in a porous medium is weaker than in a free fluid (without porosity) and decreases with the decreasing permeability of the porous medium. The use of a porous medium model in the Darcy-Brinkman-Forchheimer approximation showed the effect of the Forchheimer parameter on heat transfer during film boiling in a porous medium. An increase in the Forchheimer parameter leads to heat transfer deterioration, which is more significant at small values of the Darcy number. Effects of different thermal boundary conditions on the heated wall on the heat transfer are insignificant.
多孔介质对膜沸腾液体热交换的影响
本文研究了浸泡在多孔介质中的垂直加热壁面上的液体在不同多孔介质参数和壁面加热条件下的膜沸腾传热过程。利用Darcy-Brinkman-Forchheimer模型得到了问题的解析解。结果表明,多孔介质中膜沸腾的传热强度弱于自由流体(无孔隙),且传热强度随多孔介质渗透率的降低而降低。在Darcy-Brinkman-Forchheimer近似中使用多孔介质模型,显示了Forchheimer参数对多孔介质中膜沸腾传热的影响。Forchheimer参数的增大导致换热恶化,且在达西数较小时更为明显。受热壁面不同的热边界条件对传热的影响不显著。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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