LBM simulation of bubble breakup dynamics in microchannels at large density ratios

IF 4.3 2区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Science Pub Date : 2025-01-23 DOI:10.1016/j.ces.2025.121253

Muxuan Qin , Ning Zhang , Hong Zhang , Wei Zhang , Peizhuo Liu , Mingyuan Wang , Yingjin Wang , Boxiao Ren , Jinxiang Dong

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引用次数: 0

Abstract

This study develops a lattice Boltzmann model (LBM) that incorporates a Multi-Component Multi-Phase (MCMP) flow model with a Multi-Relaxation Time (MRT) collision operator to simulate bubble breakup in T-shaped microchannels accurately. This advanced LBM addresses the limitations of traditional methods in handling large density ratios, ensuring thermodynamic consistency and independent control of surface tension during bubble breakup. Observations reveal two distinct breakup behaviors: Type I bubbles maintain contact with the channel wall, initially driven by upstream pressure gradients and later by shear forces; in contrast, Type II bubbles do not contact the wall, and inertial forces hasten their breakup and expansion in a two-phase process. The study highlights the crucial role of liquid viscosity in accelerating bubble neck thinning beyond a critical point. This MCMP-MRT model offers significant insights for optimizing microfluidic system designs by elucidating bubble breakup dynamics.

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大密度比下微通道气泡破碎动力学的LBM模拟

本文建立了一种晶格玻尔兹曼模型（LBM），该模型结合了多组分多相流模型（MCMP）和多松弛时间碰撞算子（MRT）来精确模拟t型微通道中的气泡破裂。这种先进的LBM解决了传统方法在处理大密度比方面的局限性，确保了气泡破碎过程中热力学一致性和表面张力的独立控制。观察结果揭示了两种不同的破裂行为：I型气泡与通道壁面保持接触，最初受上游压力梯度驱动，后来受剪切力驱动；相比之下，II型气泡不接触壁面，惯性力加速其破裂和膨胀的两相过程。该研究强调了液体粘度在加速气泡颈细化超过临界点方面的关键作用。该MCMP-MRT模型通过阐明气泡破裂动力学，为优化微流体系统设计提供了重要的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chemical Engineering Science 工程技术-工程：化工

CiteScore

7.50

自引率

8.50%

发文量

1025

审稿时长

50 days

期刊介绍： Chemical engineering enables the transformation of natural resources and energy into useful products for society. It draws on and applies natural sciences, mathematics and economics, and has developed fundamental engineering science that underpins the discipline. Chemical Engineering Science (CES) has been publishing papers on the fundamentals of chemical engineering since 1951. CES is the platform where the most significant advances in the discipline have ever since been published. Chemical Engineering Science has accompanied and sustained chemical engineering through its development into the vibrant and broad scientific discipline it is today.