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首页> 外文期刊>Brazilian journal of chemical engineering >Experimental investigation of the liquid volumetric mass transfer coefficient for upward gas-liquid two-phase flow in rectangular microchannels
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Experimental investigation of the liquid volumetric mass transfer coefficient for upward gas-liquid two-phase flow in rectangular microchannels

机译：矩形微通道内气液两相向上流动的液体体积传质系数的实验研究

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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.
机译：由于特殊的动力学特性，微通道中的气液两相传质过程非常复杂。在这项工作中，探索了一种测量液体侧体积传质系数kLa的新方法。利用压力传感器测量三个垂直矩形微通道中向上的气液两相流的压力变化，并通过气相的压力-体积-温度相关性计算出液体侧的体积传质系数kLa。将二氧化碳-水，二氧化碳-乙醇和二氧化碳-正丙醇分别用作工作流体。微通道的尺寸分别为40μm×240μm（深度×宽度），100μm×800μm和100μm×2000μm。结果表明，通道直径和毛细管数显着影响kLa，并且kLa的最大值出现在环形流态中。基于Sherwood数，Schmidt数和毛细管数，提出了一种新的kLa相关性。 kLa的预测值与实验数据吻合良好。

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