Numerical investigation on the impact of a droplet onto a target spherical surface
Wang Yanen, Zhou Jinhua, Qin Yanlei, Li Penglin, Yang Mingming, Han Qin, Wang Yuebo, Wei Shengmin,
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School of Mechantronics, The Key Laboratory of Contemporary Design and Integrated Manufacturing Technology,Northwestern Polytechnical University, Xi’an 710072,China
The deposition behavior of droplet impacting on a spherical surface during liquid-jet process is illustrated in this paper. The deformation model of a single droplet depositing on the spherical surface substrate was established by the theory of volume of fluid (VOF). These Kinetic, spreading, relaxation and wetting phases of droplet movement have been respectively demonstrated in detail. The dynamic behavior of a droplet on a spherical surface is simulated on Fluent (6.3 version) numerical analysis platform. The effects of impact velocity, curvature radius of spherical surface, surface tension and viscosity are investigated on the deposition behavior of a droplet. There are four conclusions can be draw from simulation results as follows. With increasing the impact velocity of droplet, the maximum spreading diameter will increase and the minimum spreading thickness will reduce; Both the maximum spreading diameter and the minimum spreading thickness will increase along with increasing the diameter of target ball; Above a certain viscosity coefficient of experiment liquid,the maximum spreading diameter reduces and the minimum spreading thickness increases with the increasing its viscosity coefficient; When the tension coefficient of liquid droplet is increased, the maximum spreading diameter reduces and the minimum spreading thickness increases. In the initial stage of droplet spreading, the spreading thickness decreases linearly with the droplet impact velocity. In addition, when the impact speed of droplet is too large, either liquid’s surface tension coefficient or the target sphere diameter is too small, a local breakage occurs at the center of the droplet collision with a spherical surface during the first recoiling stage.
Wang Yanen; Zhou Jinhua;Qin Yanlei;Li Penglin;Yang Mingming;Han Qin;Wang Yuebo;Wei Shengmin;.
Numerical investigation on the impact of a droplet onto a target spherical surface[J]. Journal of Vibration and Shock, 2012, 31(20): 51-55