Dynamic behavior of droplet impact on the concave surface with liquid film

doi:10.7523/j.issn.2095-6134.2020.02.016

Abstract

Abstract: In this paper we present results of a numerical investigation into a single drop impact on a rectangular grooved substrate with thin liquid film covering it. Particularly, effects of the height and width of the ridge on surface and dynamic behavior of droplet impact into thin liquid film were mainly studied. Simulations were performed using CLSVOF (coupled level-set and VOF) to track the air-water interface accurately and to keep conservation of mass at the same time. Results show that the structure of grooved surface has significant influence on the evolution of liquid film when droplet impacts on it. With the increase of rectangular groove height, the thickness of the coronal water becomes thin and the secondary droplets produce easily. Increase of the viscosity of liquid film inhibits coronal water flower formation and secondary droplet generation. When the surface tension of liquid film reduces, the jet is obvious and more secondary droplets produce. The splash phenomenon is advanced, and the disappearance of the crown water flower is delayed. Our research sheds some lights on the fundamental understanding of many industrial phenomena.

Key words: droplet impact, multiphase flow, concave surface, CLSVOF (couple level-set and volume of fluid)

CLC Number:

TK124

ZHOU Xin, WANG Hong, ZHU Xun, CHEN Rong, LIAO Qiang, DING Yudong. Dynamic behavior of droplet impact on the concave surface with liquid film[J]. , 2020, 37(2): 255-262.

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