润湿性对表面液滴和气泡动力学的影响
Wetting effects on the dynamics of droplets and bubbles at surfaces
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中文总结 AI 辅助
研究润湿性对液滴和气泡动力学的影响，用三维流体体积框架结合动态润湿性模型研究三个基准，模型经实验验证，能准确再现相关动力学过程，表明准确处理动态润湿性对预测此类现象至关重要。
中文摘要 AI 辅助
动态润湿性通过影响接触线运动和界面演化，在固体表面液滴和气泡动力学中起着重要作用。本文利用三维流体体积框架结合基于接触线速度重建方法的动态润湿性模型，研究了液滴飞溅、固体表面气泡合并和剪切流中气泡动力学这三个具有代表性的润湿性控制基准。该模型首先针对液滴飞溅和气泡合并的实验观测和文献数据进行了验证，准确再现了瞬态接触线演化、飞溅形态和合并动力学。特别是，动态润湿性抑制了静态润湿性模型预测的过早气泡脱离，与实验观测结果的一致性显著提高。在剪切流中，接触角滞后和接触线耗散强烈影响气泡变形、滑动和脱离。这些结果表明，准确处理动态润湿性对于预测涉及快速接触线运动、强烈界面变形和拓扑变化的润湿性控制液滴和气泡至关重要。
英文摘要
Dynamic wetting plays a fundamental role in the dynamics of droplets and bubbles at solid surfaces by influencing contact line motion and interfacial evolution. In this work, three representative wetting-controlled benchmarks, namely droplet splashing, bubble coalescence at solid surfaces, and bubble dynamics under shear flow, are investigated using a three-dimensional volume-of-fluid framework coupled with a recently developed dynamic wetting model based on contact line velocity reconstruction method [19]. The model is first validated against experimental observations and literature data for droplet splashing and bubble coalescence. It accurately reproduces the transient contact line evolution, splashing morphology, and coalescence dynamics. In particular, dynamic wetting suppresses the premature bubble detachment predicted by static wetting models and yields substantially improved agreement with experimental observations. In shear flow, contact angle hysteresis and contact line dissipation strongly influence bubble deformation, sliding, and detachment. These results demonstrate that accurate treatment of dynamic wetting is essential for predicting wetting-controlled droplets and bubbles involving rapid contact line motion, strong interfacial deformation, and topology changes.
