蛇形微通道内泄漏流特性

doi:10.16085/j.issn.1000-6613.2020-2373

摘要/Abstract

摘要：

微流体系统通常具备极大的比表面积、易于控制等优势，在气-液相传质、传热、反应等方面具有良好的应用前景。本文考察了6个气液相体系在矩形截面蛇形微通道中的气液两相泰勒流流动情况以及气泡和液弹的动态行为，以气泡截面形状的几何模型为基础，得到了微通道中净泄漏流的量化方程。同时发现在较大的操作区间内，蛇形微通道对泄漏流的可控性优于直形微通道。并且详细分析了不同气液相流量、液相物性（表面张力和黏度）和气泡长度对蛇形微通道主通道净泄漏流的具体影响。

关键词: 净泄漏流, 气液相流量, 液相物性, 气泡长度, 预测

Abstract:

Microfluidic platforms have promising applications in gas-liquid mass transfer, heat transfer and chemical reaction, due to its great specific surface area, precise control of residence time, and stability of transport process. The Taylor flow for six different gas-liquid systems with different surface tensions and viscosities were systematically investigated in rectangular cross-section serpentine microchannels, aiming at dynamic behavior of bubbles and liquid slugs. Based on geometric model of bubble cross-sectional shape, quantitative equation of the net leakage flow was successfully obtained. It was simultaneously found that the controllability of the serpentine microchannel on the leakage flow is better than that of the straight microchannel in a larger operating range. And the effects of different gas-liquid flow rates, liquid physical properties (surface tension and viscosity) and bubble length on the net leakage flow of the main channel for the serpentine microchannel were respectively analyzed in detail.

Key words: net leakage flow, gas and liquid flow, liquid physical properties, bubble length, prediction

中图分类号:

TQ021.4

梁倩卿, 卜亿峰, 门卓武, 马学虎. 蛇形微通道内泄漏流特性[J]. 化工进展, 2021, 40(11): 5973-5980.

LIANG Qianqing, BU Yifeng, MEN Zhuowu, MA Xuehu. Characteristics of leakage flow in a serpentine microchannel[J]. Chemical Industry and Engineering Progress, 2021, 40(11): 5973-5980.

图/表 7

表1 实验涉及的液相试剂物理化学性质

液相	密度/ kg·m^-3	黏度/ mPa·s	表面张力/mN·m^-1
去离子水	997	0.890	72.2
2%正丙醇水溶液	987.2	1.154	41.8
5%正丙醇水溶液	975.6	1.574	30.5
甲醇	786	0.546	22.2
乙醇	785	1.099	22.7
正丙醇	800	1.942	23.4

图1 微通道构型及微通道流动系统流程1—液体储罐；2—过滤器；3—高压恒流泵；4—缓冲罐；5—气瓶；6—压力调节器；7—质量流量控制器；8—高速摄像系统；9—微通道；10—微通道吸收器；11—分离器；12—计算机；13—压差变送器

图2 矩形微通道中气泡截面形状以及液膜厚度的分布情况和实验图片

图3 不同气液相体系主通道中的净泄漏流量随着液相流量的变化情况

图4 液相物理性质对于主通道净泄漏流量的影响

图5 黏度变化体系的气泡形状变化与偏离壁面情形

图6 气泡长度对于主通道中的净泄漏流量的影响

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