Joung Young Soo, Buie Cullen R
Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2014 Jan;89(1):013015. doi: 10.1103/PhysRevE.89.013015. Epub 2014 Jan 21.
This study investigates drop impingement on highly wetting porous films and papers. Experiments reveal previously unexplored impingement modes on porous surfaces designated as necking, spreading, and jetting. Dimensional analysis yields a nondimensional parameter, denoted the Washburn-Reynolds number, relating droplet kinetic energy and surface energy. The impingement modes correlate with Washburn-Reynolds number variations spanning four orders of magnitude and a corresponding energy conservation analysis for droplet spreading shows good agreement with the experimental results. The simple scaling laws presented will inform the investigation of dynamic interactions between porous surfaces and liquid drops.
本研究调查了液滴撞击高润湿性多孔薄膜和纸张的情况。实验揭示了在多孔表面上存在以前未被探索的撞击模式，即缩颈、铺展和喷射。量纲分析得出一个无量纲参数，称为沃什伯恩-雷诺数，它与液滴动能和表面能相关。撞击模式与跨越四个数量级的沃什伯恩-雷诺数变化相关，并且对液滴铺展进行的相应能量守恒分析与实验结果吻合良好。所提出的简单比例定律将为多孔表面与液滴之间动态相互作用的研究提供依据。
