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首页> 外文会议>International heat transfer conference;IHTC1998 >Numerical study of capillary rewetting in porous media
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Numerical study of capillary rewetting in porous media

机译：多孔介质中毛细管再润湿的数值研究

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A theoretical analysis was performed to describe the two-dimensional rewetting process in porous media with a constant heat flux at the top surface. Numerical solutions were obtained by an implicit finite difference scheme tailored to take account of the movement of the liquid front as rewetting progresses. The rewetting velocity and liquid front shape were obtained and found to vary with the applied heat flux, the permeability and porosity of the porous media, the thermophysical properties of the rewetting fluid and the porous media material. The maximum sustainable heat flux and the transient temperature distribution of the porous media were also predicted. In this study, the length of the porous media was chosen to be 250 mm, while the hieght varied from 20 to 30 mm. The pore diameter was varied from 2 to 8 #mu#m and the porosity range was 0.5-0.7. The working fluids investigated were water, ammonia, and acetone for porous nickel and stainless steel systems.
机译：进行了理论分析，以描述在顶部表面具有恒定热通量的多孔介质中的二维再润湿过程。数值解决方案是通过隐式有限差分方案获得的，该方案旨在考虑再润湿过程中液体前沿的运动。获得了再润湿速度和液体前部形状，并发现其随所施加的热通量，多孔介质的渗透性和孔隙率，再润湿流体和多孔介质材料的热物理性质而变化。还预测了多孔介质的最大可持续热通量和瞬态温度分布。在这项研究中，多孔介质的长度选择为250毫米，而高度从20到30毫米不等。孔径为2〜8μm，孔隙率范围为0.5〜0.7。研究的工作流体是用于多孔镍和不锈钢系统的水，氨和丙酮。

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