Gas-liquid Taylor flow pressure drop in rectangular meandering microchannel

doi:10.11949/j.issn.0438-1157.20181235

Abstract

Abstract:

The pressure drop of gas-liquid two-phase Taylor flow in a rectangular meandering microchannel at low CO₂ pressure (CO₂,5% (vol), N₂,95%(vol)) was measured. By comparing the six gas-liquid phase systems, it is found that the physical properties of the liquid phase have a significant effect on the pressure drop of the gas-liquid two-phase Taylor flow. The pressure drop of two-phase flow showed a linear increasing trend with the increasing liquid velocity for surface tension variation group, while for the viscosity variation group, the pressure drop of two-phase flow had a poor linearity with liquid phase velocity, and the pressure drop of two-phase flow increases regularly with $j L 2 / 3$ . The comparison between the predicted results from the literatures models and measured data was also made. Considering the effects of the liquid internal circulation, bubble shape and motion, channel characteristic configuration (channel cross section and overall configuration) and physical chemistry of the liquid phase， a two-phase flow pressure drop model was proposed, and a mean deviation ±20% can be obtained.

Key words: two-phase flow, rectangular section, microchannels, pressure drop, model

摘要：

主要测定了低分压CO₂（混合气相组成为5%CO₂和95%N₂，简写为CO₂/N₂）在矩形截面多弯头微通道中气-液两相Taylor流的流动压降。通过对比六个气液相体系，发现液相的物理性质对气液两相Taylor流压降的影响显著不同。表面张力变化组（CO₂/N₂-水、CO₂/N₂ -2%正丙醇水溶液和CO₂/N₂ -5%正丙醇水溶液）的气液两相Taylor流压降随液相流速的增大呈现线性增长趋势；黏度变化组（CO₂/N₂-甲醇、CO₂/N₂-乙醇和CO₂/N₂-正丙醇）的气液两相Taylor流压降随着 $j L 2 / 3$ 变化而呈现规律性增大。重点考虑了弯曲通道二次流和液弹内循环的贡献，同时分析考虑了气泡的形状及其运动、通道特征参数和液相的物理性质，提出了新的气液两相Taylor流压降的表观摩擦系数模型，在±20%误差范围内获得了良好的预测效果。

关键词: 两相流, 矩形截面, 微通道, 压降, 模型

CLC Number:

TQ 021.4

Qianqing LIANG, Xuehu MA, Kai WANG, Jiang CHUN, Tingting HAO, Zhong LAN, Yaxiong WANG. Gas-liquid Taylor flow pressure drop in rectangular meandering microchannel[J]. CIESC Journal, 2019, 70(4): 1272-1281.

梁倩卿, 马学虎, 王凯, 春江, 郝婷婷, 兰忠, 王亚雄. 矩形截面弯曲型微通道气液两相Taylor流压降的研究[J]. 化工学报, 2019, 70(4): 1272-1281.

Figures/Tables 10

Table 1 Physicochemical properties of liquid phase[36]

Liquid phase	Density, ρ/(kg·m^-3)	Viscosity, μ/(mPa· s)	Surface tension， σ/(mN·m^-1)
deionized water	997	0.890	72.2
2% (mole fraction) propanol aqueous solution (2% NPA)	987.2	1.154	41.8
5% (mole fraction) propanol aqueous solution (5% NPA)	975.6	1.574	30.5
methanol(MT)	786	0.546	22.2
ethanol(EA)	785	1.099	22.7
propanol(NPA)	800	1.942	23.4

Fig. 1 Configuration of T-junction rectangular meandering microchannels used in this work

Fig.2 Flow chart for CO2 absorption in microchannel

Fig.3 Effect of liquid-phase velocity on pressure drop of two-phase flow variation in CO2/N2-5%NPA, CO2/N2-2%NPA,CO2/N2-H2O

Fig.4 Effect of liquid-phase velocity on pressure drop of two-phase flow variation in CO2/N2-MT,CO2/N2–EA,CO2/N2-NPA

Fig.5 Pressure drop of two-phase flow variation with j L 2 / 3 in microchannel

Fig.6 Parameter a in model of Kreutzer et al. [24] and plotted as a function of Re TP in various gas-liquid systems

Fig.7 Experimental (f exp,Total Re)TP plotted against (fRe)TP, Theory with literature in CO2/N2-5% NPA, CO2/N2-2% NPA and CO2/N2 -H2O

Fig.8 Experimental (f exp,Total Re)TP plotted against (fRe)TP, Theory with literature in CO2/N2-MT, CO2/N2 -EA and CO2/N2 -NPA

Fig.9 Experimental vs predicted f app Re TP in various gas-liquid systems for rectangular meandering microchannels

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