This study numerically investigated the behavior of a Newtonian droplet impacting a heated porous surface. In this regard, a two-phase finite volume code was used for laminar flow. The time adaptive method was applied to enhance the accuracy of results and better convergence of the solving process. Also, the dynamic grid adaptation technique was adopted to predict the liquid-air interface precisely. The results were first validated against experimental data at different Weber numbers. Then the effect of variations in the droplet temperature was investigated on the spreading factor. The obtained results revealed that the rise in droplet temperature led to an increase in the maximum spreading diameter due to the reduction in the effects of viscosity, density, and surface tension. In the next step, the effects of droplet impact on the hydrophilic and superhydrophobic surfaces with the porosities of 20–80% were evaluated. The obtained results revealed that the increase in the surface porosity caused a decrease in the droplet diameter during the impact time. Also, at high surface porosity values, the decline in the contact angle influence on the droplet dynamic behavior was observed.

中文翻译：

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不同工作条件下液滴撞击加热多孔表面的研究；数学建模

本研究以数值方式研究了牛顿液滴撞击加热多孔表面的行为。在这方面，两相有限体积代码用于层流。应用时间自适应方法来提高结果的准确性和更好的求解过程的收敛性。此外，采用动态网格自适应技术来精确预测液-气界面。结果首先根据不同韦伯数的实验数据进行了验证。然后研究了液滴温度变化对扩散因子的影响。获得的结果表明，由于粘度、密度和表面张力的影响降低，液滴温度的升高导致最大铺展直径的增加。在下一步中，评估了液滴撞击对孔隙率为 20-80% 的亲水和超疏水表面的影响。获得的结果表明，表面孔隙率的增加导致冲击时间期间液滴直径的减小。此外，在高表面孔隙率值下，观察到接触角对液滴动态行为的影响下降。