Numerical investigation on the dynamic behavior of bubbles under forced flow in a microchannel†

IF 4.6 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
RSC Advances Pub Date : 2025-07-08 DOI:10.1039/D5RA02116B
Dayong Li, Junbo Xing, Ziqun Zhang and Hongfei Wang
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引用次数: 0

Abstract

Understanding the process of bubble detachment and motion along microchannel walls, driven by liquid flow, is crucial for elucidating bubble dynamics and realizing diverse applications within the realm of microfluidics. This paper uses the phase-field method to perform a comprehensive numerical study on the conversion of surface gas bubbles into bulk bubbles at the lower wall of a microfluidic channel. The study identifies several key factors that have a coupled impact on the ‘surface-bulk’ conversion, including wall wettability, Reynolds number, and the initial contact angle/volume of the surface bubbles (with contact angle and volume positively correlated at a fixed base radius). Specifically, higher Reynolds numbers, smaller initial bubble contact angles, and more hydrophilic channel walls facilitate the detachment of surface bubbles from the channel wall. However, at high Reynolds numbers, bubbles on superhydrophilic surfaces may be split, causing fluctuations or longer conversion time. Conversely, as wall hydrophobicity increases, surface bubbles remain attached.

Abstract Image

微通道强制流动条件下气泡动力学行为的数值研究
了解气泡在液体流动驱动下沿微通道壁分离和运动的过程,对于阐明气泡动力学和实现微流体领域的多种应用至关重要。本文采用相场法对微流控通道下壁表面气泡向体气泡的转化过程进行了全面的数值研究。该研究确定了几个对“表面-体积”转换有耦合影响的关键因素,包括壁面润湿性、雷诺数和表面气泡的初始接触角/体积(在固定的基底半径下,接触角和体积呈正相关)。具体而言,较高的雷诺数、较小的初始气泡接触角和更亲水的通道壁有利于表面气泡从通道壁上脱离。然而,在高雷诺数下,超亲水表面上的气泡可能会分裂,引起波动或更长的转化时间。相反,随着壁疏水性的增加,表面气泡仍然附着。
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来源期刊
RSC Advances
RSC Advances chemical sciences-
CiteScore
7.50
自引率
2.60%
发文量
3116
审稿时长
1.6 months
期刊介绍: An international, peer-reviewed journal covering all of the chemical sciences, including multidisciplinary and emerging areas. RSC Advances is a gold open access journal allowing researchers free access to research articles, and offering an affordable open access publishing option for authors around the world.
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