相对浸润性对双元液滴碰撞影响的数值研究

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中图分类号：0351.2 文献标志码：A

DOI： 10.7652/xjtuxb202511011 文章编号：0253-987X（2025）11-0115-10

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 wetability 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 colision and coalescence processes in practical engineering applications.

Keywords： wetting property; surface tension; moving particle semi-implicit method; droplet

液滴间的相互碰撞广泛发生在工业生产和生活当中。（剩余14954字）