Experimental investigation of the liquid volumetric mass transfer coefficient for upward gas-liquid two-phase flow in rectangular microchannels

Brazilian Journal of Chemical Engineering

X. Y. Ji¹  Y. G. Ma¹  T. T. Fu¹  Ch. Y. Zhu¹  D. J. Wang¹ 

[1] ,Tianjin University State Key Laboratory of Chemical Engineering School of Chemical Engineering and TechnologyTianjin,China

关键词: Microchannels;    Gas-liquid upward two-phase flow;    Mass transfer;    Pressure variation;   

DOI  :  10.1590/S0104-66322010000400009

来源: SciELO

【 摘 要 】

The gas-liquid two-phase mass transfer process in microchannels is complicated due to the special dynamical characteristics. In this work, a novel method was explored to measure the liquid side volumetric mass transfer coefficient kLa. Pressure transducers were utilized to measure the pressure variation of upward gas-liquid two-phase flow in three vertical rectangular microchannels and the liquid side volumetric mass transfer coefficient kLa was calculated through the Pressure-Volume-Temperature correlation of the gas phase. Carbon dioxide-water, carbon dioxide-ethanol and carbon dioxide-n-propanol were used as working fluids, respectively. The dimensions of the microchannels were 40 µm×240 µm (depth×width), 100 µm×800 µm and 100 µm×2000 µm, respectively. Results showed that the channel diameter and the capillary number influence kLa remarkably and that the maximum value of kLa occurs in the annular flow regime. A new correlation of kLa was proposed based on the Sherwood number, Schmidt number and the capillary number. The predicted values of kLa agreed well with the experimental data.

【 授权许可】

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