泰勒流经方形微通道时的压降和气泡速度

IF 2.3 4区 工程技术 Q2 INSTRUMENTS & INSTRUMENTATION
Ryo Kurimoto, Kosuke Hayashi, Akio Tomiyama
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引用次数: 0

摘要

对水平方形微通道中的气液泰勒流进行了界面跟踪模拟,以了解气泡部分的压降与气泡头部和尾部曲率之间的关系。数值条件为 0.00159 ≤ CaT ≤ 0.0989、0.0817 ≤ WeT ≤ 25.4 和 8.33 ≤ ReT ≤ 791,其中 CaT、WeT 和 ReT 是基于总体积流量的毛细管数、韦伯数和雷诺数。气泡部分的无量纲压降随着毛细管数和韦伯数的增加而增大。随着毛细管数的增大,气泡头部的曲率增大,气泡尾部的曲率减小。由于韦伯数的增加,气泡尾部的曲率变化比气泡头部的变化更为显著,这是在相同毛细管数下气泡部分压力下降较大的主要原因。此外,还讨论了气泡速度与总体积流量之间的关系。无惯性效应的漂移-通量模型的分布参数与毛细管数的关系很简单。以毛细管数和韦伯数表示的分布参数的相关性得到了发展,并被证实能够很好地预测气泡速度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Pressure drop and bubble velocity in Taylor flow through square microchannel

Pressure drop and bubble velocity in Taylor flow through square microchannel

Interface tracking simulations of gas–liquid Taylor flow in horizontal square microchannels were carried out to understand the relation between the pressure drop in the bubble part and the curvatures at the nose and tail of a bubble. Numerical conditions ranged for 0.00159 ≤ CaT ≤ 0.0989, 0.0817 ≤ WeT ≤ 25.4, and 8.33 ≤ ReT ≤ 791, where CaT, WeT, and ReT are the capillary, Weber, and Reynolds numbers based on the total volumetric flux. The dimensionless pressure drop in the bubble part increased with increasing the capillary number and the Weber number. The curvature at the nose of a bubble increased and that at the tail of a bubble decreased as the capillary number increased. The variation of the curvature at the tail of a bubble was more remarkable than that at the nose of a bubble due to the increase in the Weber number, which was the main cause of large pressure drop in the bubble part at the same capillary number. The relation between the bubble velocity and the total volumetric flux was also discussed. The distribution parameter of the drift-flux model without inertial effects showed a simple relation with the capillary number. A correlation of the distribution parameter, which is expressed in terms of the capillary number and the Weber number, was developed and was confirmed to give good predictions of the bubble velocity.

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来源期刊
Microfluidics and Nanofluidics
Microfluidics and Nanofluidics 工程技术-纳米科技
CiteScore
4.80
自引率
3.60%
发文量
97
审稿时长
2 months
期刊介绍: Microfluidics and Nanofluidics is an international peer-reviewed journal that aims to publish papers in all aspects of microfluidics, nanofluidics and lab-on-a-chip science and technology. The objectives of the journal are to (1) provide an overview of the current state of the research and development in microfluidics, nanofluidics and lab-on-a-chip devices, (2) improve the fundamental understanding of microfluidic and nanofluidic phenomena, and (3) discuss applications of microfluidics, nanofluidics and lab-on-a-chip devices. Topics covered in this journal include: 1.000 Fundamental principles of micro- and nanoscale phenomena like, flow, mass transport and reactions 3.000 Theoretical models and numerical simulation with experimental and/or analytical proof 4.000 Novel measurement & characterization technologies 5.000 Devices (actuators and sensors) 6.000 New unit-operations for dedicated microfluidic platforms 7.000 Lab-on-a-Chip applications 8.000 Microfabrication technologies and materials Please note, Microfluidics and Nanofluidics does not publish manuscripts studying pure microscale heat transfer since there are many journals that cover this field of research (Journal of Heat Transfer, Journal of Heat and Mass Transfer, Journal of Heat and Fluid Flow, etc.).
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