数字模拟不溶性表面活性物质质量转移在可变形泡泡接口上,通过相场格子博尔兹曼法-有限差异法混合方法的相场格子
Hanyang Mo1,2, Yumei Yong2, Wenqiang Chen2
1Institute of Chemical & Environmental Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China.
Langmuir : the ACS journal of surfaces and colloids
|August 29, 2023
概括
一个新的模型准确地模拟了双相流程中的充满表面活性剂的气泡. 马兰戈尼压力影响泡传输,其影响取决于表面活性剂数 (Sh) 和雷诺兹数 (ReH).
科学领域:
- 流体动力学 流体动力学
- 计算物理学的计算物理.
- 表面科学是一门科学.
背景情况:
- 在双相流中管理气泡形状和运输需要平衡复杂的物理现象,如Marangoni应力和接口质量转移.
- 现有的模型在模拟过程中经常面临精度,计算成本或质量损失的限制.
研究的目的:
- 开发和验证一种新的计算模型,用于模拟液体流中的充满表面活性剂的气泡.
- 在不同的物理条件下研究这些气泡的变形和运输动态.
主要方法:
- 开发了一种混合模型,将相场格子博尔兹曼法 (PFLBM) 与有限差异法 (FDM) 和幽灵细胞技术相结合.
- 验证了PFLBM-FDM模型的准确性,计算效率和最小质量损失.
- 模拟探索了层状库埃特流中的泡行为,以及密度比率,表面张力,剪切速度和扩散系数等不同参数.
主要成果:
- 当表面活性剂数 (Sh) 超过100时,泡变形平衡由无维数确定.
- 气泡运输速度可以通过马兰戈尼应力和剪切速度之间的相互作用来控制.
- 马兰戈尼应力作为一种远程力,当Sh>100时,加速泡10%左右,这种效应通过增加雷诺兹数 (ReH) 来放大.
结论:
- 开发的PFLBM-FDM模型提供了一种经过验证的,高效的方法来模拟使用马兰戈尼效应的双相流.
- 建立了泡变形的预测相关性,结合了流体密度,误差为<5%.
- 了解马兰戈尼应力动态对于控制各种应用中的气泡传输至关重要.
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