液滴撞击固体球面行为特性的数值研究

汪焰恩 周金华; 秦琰磊; 李鹏林;杨明明;韩琴;王月波; 魏生民;

振动与冲击 ›› 2012, Vol. 31 ›› Issue (20) : 51-55.

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (20) : 51-55.
论文

液滴撞击固体球面行为特性的数值研究

  • 汪焰恩1 周金华1,2 秦琰磊1,2 李鹏林1,2 杨明明1,2 韩琴1,2 王月波1,2 魏生民1,2
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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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摘要

基于VOF理论,建立了单个液滴撞击球面基板的模型,并分析了液滴的运动、射流、弛豫和平衡四个阶段的形态变化。对液滴正向撞击球面的过程进行了数值模拟,重点研究了冲击速度、球面直径、表面张力和粘度对液滴沉积行为的影响。结果表明,增加撞击速度,最大铺展直径增加,最小铺展厚度减小;增加球面直径,最大铺展直径增加,最小铺展厚度增加;超过一定粘度后,增加粘度系数,最大铺展直径减小,最小铺展厚度增加;增加表面张力系数,最大铺展直径减小,最小铺展厚度增加。在碰撞初期,铺展厚度以碰撞速度线性递减。当速度过大、球面直径或表面张力过小,会导致液膜出现中心局部破裂现象。

Abstract

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.

关键词

液滴 / 撞击 / 球面 / 表面张力 / 粘度

Key words

droplet / impact / spherical surface / surface tension / viscosity

引用本文

导出引用
汪焰恩 周金华; 秦琰磊; 李鹏林;杨明明;韩琴;王月波; 魏生民;. 液滴撞击固体球面行为特性的数值研究[J]. 振动与冲击, 2012, 31(20): 51-55
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

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