微通道中Taylor气泡传质过程的数值模拟  

Numerical simulation of the gas-liquid mass transfer in Taylor flow in the microchannel

作　　者：季喜燕[1] 李军湘[1] 刘丽静[1] 郭玉玮[1] 

机构地区：[1]内蒙古科技大学包头师范学院化学学院,内蒙古自治区包头014030

出　　处：《计算机与应用化学》2016年第9期1027-1031,共5页Computers and Applied Chemistry

基　　金：内蒙古自治区自然科学基金项目(2013MS0213);内蒙古自治区高等学校科学研究项目(NJZY13222)

摘　　要：由于尺度的微型化,微型通道内流体流动以及传质过程的实验研究受到巨大限制,随着计算机技术的快速发展,数值模拟已经成为研究分析复杂问题的重要方法。本文采用计算机VOF方法 FLUENT模拟软件对微通道内气液两相Taylor流型的传质过程进行模拟,主要集中在单个Taylor气泡及其前后相邻的液柱单元内进行。通过更改模拟参数,得到不同因素对传质过程的影响结果。结果表明,Taylor气泡单元中液柱径向中间部分存在较大的CO_2浓度分布,而采用不同液相时,相同位置处正丙醇中CO_2浓度较无水乙醇及蒸馏水中CO_2浓度大,在不同管径的微通道中,液相侧体积传质系数均随着气泡速率的增大而增加,随着Taylor气泡单元长度的增加而减小。文献中渗透理论模型在参数m取值为4.5时的计算结果与本文结果比较接近,证实了Taylor流动中的传质主要发生在液膜中。Experimental research of flow and mass transfer process in microchannel was great limited by the miniaturization of scale, while with the rapid development of computer technology, numerical simulation has become an favorable method for resolving comPlex problem, the computer VOF method FLUENT simulation software was adopted in this paper for simulating the mass transfer process of Taylor flow in microcharmel, which mainly concentrated in a single Taylor bubble and its adjacent liquid column cell. The influences of different factors on the mass transfer process were obtained by changing the simulation parameters, and the results shows that, larger CO2 concentration distribution exists in the middle part of the liquid column in radial, when using different liquid phases, the CO2 concentration in n-propyl is larger than anhydrous ethanol and distilled water at the same location, in microcharmels of different diameter, liquid side volumetric mass transfer coefficient increases with the bubble rate increasing while decreases with Taylor bubble length. The calculated results of penetration model at the value of the parameter m is 4.5 and the results in this paper were very close, which con- firmed the mainly mass transfer occurs in the liquid film of the Taylor flow.

关 键 词：微型通道 Taylor流型 气液传质 数值模拟 

分 类 号：TQ021.4[化学工程]