Numerical Study on the Effect of Relative Wettability on Binary Droplet Collision

ZHANG Yifan; SUN Yijie; SUN Zhongguo; XI Guang

doi:10.7652/xjtuxb202511011

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Numerical Study on the Effect of Relative Wettability on Binary Droplet Collision

更新时间：2025-11-11

- Numerical Study on the Effect of Relative Wettability on Binary Droplet Collision
- Journal of Xi'an Jiaotong University Vol. 59, Issue 11, Pages: 115-124(2025)
- 作者机构：
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202511011
  CLC： O351.2
- Received：01 April 2025，
  
  Published：10 November 2025
- 稿件说明：
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ZHANG Yifan, SUN Yijie, SUN Zhongguo, et al. Numerical Study on the Effect of Relative Wettability on Binary Droplet Collision[J]. Journal of Xi'an Jiaotong University, 2025, 59(11): 115-124.
DOI：

ZHANG Yifan, SUN Yijie, SUN Zhongguo, et al. Numerical Study on the Effect of Relative Wettability on Binary Droplet Collision[J]. Journal of Xi'an Jiaotong University, 2025, 59(11): 115-124. DOI： 10.7652/xjtuxb202511011.

摘要

为了阐明液滴间的相对浸润性对液滴碰撞现象及过程的影响，采用无网格移动粒子半隐式（MPS）方法，建立了不同相对浸润性下的表面张力模型。在传统表面自由能模型的基础上，采用流体间宏观接触角拟合两相流体在界面处的分子间势能，实现不同浸润性下双元液滴碰撞与融合过程的仿真。通过大量数值计算，分析了双元液滴碰撞与融合的机理，根据韦伯数和碰撞参数划分了双元液滴碰撞的聚并、破碎和拉伸分离区域，研究了流体的相对浸润性对双元液滴碰撞形态及结果的影响。结果表明：相对浸润性对碰撞机理图的影响十分明显，在相对浸润角从0°增加至120°的过程中，拉伸分离-融合分界线随相对浸润角增加向低韦伯数方向单调偏移；在相对浸润角从0°增加至60°时，融合-破碎分界线向低韦伯数方向偏移，相对浸润角继续增加至120°时，分界线又向高韦伯数方向回移。该结论为实际工程中液滴碰撞与融合过程的研究提供了相关理论依据。

Abstract

To elucidate the influence of relative wettability between droplets on the phenomenon and process of droplet collision

a surface tension model under different relative wettability conditions is established using the meshless moving particle semi-implicit (MPS) method. Based on the traditional surface free energy model

the macroscopic contact angle between fluids is employed to fit the intermolecular potential energy of the two-phase fluids at the interface

enabling the simulation of the collision and coalescence processes of binary droplets under different wettability conditions. Through extensive numerical calculations

the mechanism of binary droplet collision and coalescence is analyzed. The coalescence

broken

and stretching separation regions of binary droplet collision are delineated according to the Weber number and collision parameter. The influence of the relative wettability of the fluids on the collision morphology and outcomes of binary droplets is investigated. The results indicate that the relative wettability has a significant impact on the collision mechanism diagram. As the relative contact angle increases from 0° to 120°

the boundary between stretching separation and coalescence monotonically shifts toward lower Weber numbers. The boundary between coalescence and broken shifts toward lower Weber numbers when the relative contact angle increases from 0°to 60°

but as the relative contact angle further increases to 120°

the boundary moves back toward higher Weber numbers. These conclusions provide relevant theoretical foundations for the research of droplet collision and coalescence processes in practical engineering applications.

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