润湿性表面气泡融合特性数值模拟分析

杨留名; 柳仕成; 裴志勇; 孔祥韶

doi:10.19693/j.issn.1673-3185.03267

润湿性表面气泡融合特性数值模拟分析

Numerical analysis on bubble coalescence characteristics of wetting surface

摘要

摘要:
目的为促进超疏水表面与气泡复合减阻技术的发展，对润湿性表面气泡的融合特性进行研究。
方法基于流体体积（VOF）方法，建立水下润湿性表面气泡融合数值模型，分析润湿性表面上气泡融合特性，揭示表面润湿性、气泡间距以及气泡尺寸对气泡融合特性的影响规律。
结果结果表明：润湿性表面接触角增大、气泡间距减小使气泡更易融合；增大气泡尺寸将减缓气泡在表面的铺展速度，也不利于加快气泡融合。
结论研究结果可为超疏水表面与气泡减阻技术的耦合设计提供参考。

Abstract:
Objectives For the development of composite drag reduction technology of super-hydrophobic surface and bubbles, the coalescence characteristics of bubbles on wetting surface are studied.
Methods Based on the volume of fluid (VOF) method, a numerical model of bubble coalescence on an underwater wetting surface is established. It is used to analyze the bubble coalescence characteristics on wetting surfaces and reveal the influence of surface wettability, bubble spacing and bubble size on bubble coalescence characteristics.
Results The results show that the increase of surface contact angle on wetting surfaces and the decrease of bubble spacing make it easier for bubbles to coalesce. Increasing the bubble size will slow down the spreading speed of bubbles on the surface, which is also not conducive to accelerating bubble coalescence.
Conclusion This study can provide a reference for the coupling design of super-hydrophobic surface and bubble drag reduction technology.

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