Numerical simulation of droplet impact and evaporation on a porous surface

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• 作者：Moonhyeok Choi^a ; Gihun Son^a ; ^{gihun@sogang.ac.kr} ; Woosup Shim^b
• 关键词：Capillary pressure ; Droplet impact ; Evaporation ; Level-set method ; Porous surface
• 刊名：International Communications in Heat and Mass Transfer
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：80
• 期：Complete
• 页码：18-29
• 全文大小：1745 K
• 卷排序：80

文摘

Numerical simulation is performed for the evaporation of a droplet impacted on a porous surface. A level-set formulation for tracking the droplet deformation is extended to include the effects of evaporation coupled to heat and mass transfer, porosity and porous drag and capillary forces. The local volume averaged conservation equations of mass, momentum, energy and vapor fraction for the porous region are simultaneously solved with the conservation equations for the external fluid region. The computations demonstrate not only the evolution of the liquid-gas interface during the whole period of droplet penetration and evaporation in a porous medium, but also the associated flow, temperature and vapor fraction fields. The effects of impact velocity, porosity and particle size on the droplet deformation and evaporation are quantified.