In this paper, droplet impact on a porous surface is experimentally investigated over a wide range of Weber numbers and surface temperatures. Regime transition criteria have been deduced to determine droplet post-impingement behaviour as a function of the Weber number and surface temperature for which a droplet impacting on a porous surface. Based on the energy balance, an analytical model with improved boundary layer description is proposed to predict maximum spreading of droplet following impact on porous surfaces when the effect of heat transfer is negligible. The results of the model indicate that the spreading process after droplet impact on porous surfaces is governed by the viscous dissipation and matric potential. The maximum-spread model predictions agreed well with experimental measurements reported in this paper and the literature over a large range of Weber numbers and different porous surfaces.

中文翻译：

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液滴对加热多孔表面的影响动力学

在本文中，液滴对多孔表面的影响在广泛的韦伯数和表面温度下进行了实验研究。已经推导出了状态转变标准，以确定作为韦伯数和液滴撞击多孔表面的表面温度的函数的液滴撞击后行为。基于能量平衡，提出了一种具有改进边界层描述的分析模型，以预测当传热影响可忽略不计时，液滴在撞击多孔表面后的最大扩散。该模型的结果表明，液滴撞击多孔表面后的扩散过程受粘性耗散和基质势的控制。