微型通道内Taylor流动的计算机模拟  

Numerical simulation of taylor flow in 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2期241-245,共5页Computers and Applied Chemistry

基　　金：内蒙古自治区自然科学基金项目(2012MS0213);内蒙古自治区高等学校科学研究项目(NJZY13222);包头师范学院青年科学基金项目(BSYKJ2012-24)

摘　　要：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,数值模拟可以打破实验手段的限制,对需要研究的参数进行更改以得到结果。由于尺度的微型化,微型通道内流体流动的实验研究受到巨大限制,本文采用计算机FLUENT模拟软件对微通道内气液两相的Taylor流动进行模拟,模拟结果与已有实验结果进行对比,验证了模型的准确性。随后改变模拟参数,得到不同因素对Taylor流动的影响结果,利用模拟计算结果拟合出预测Taylor流动过程中气泡和液柱的长度的关联式,计算机模拟比实验手段在时间和经济性方面显示出巨大优势,同时避免了常规实验操作的人为失误及不可见误差,为后续模拟计算微型通道内以及微型反应器内流体流动及传质情况奠定了基础。With the rapid development of computer technology, numerical simulation has become an important method for analyzing complex issues. It can break the restriction of experimental means, to get the results by making changes to parameters that need to be studied. Because of the micro scale, the experimental study of fluid flow in micro channel is limited. The gas-liquid two-phase Taylor flow in microchannel was simulated by the FLUENT software, the simulation results were compared with the available experimental results, to verify the accuracy of the model. Then the values of parameters were changed to get the influences of different factors on the Taylor flow, and the results shows that, under the same liquid flow rates, bubble length increases with the increasing of gas flow rates, while the length of the liquid column reduces, at the same gas velocity, bubble length decreases with liquid flow rate, while the liquid length increases; the length of Taylor bubble and liquid column increase simultaneity with the width of the microchannel, and decrease with the decreasing of microchannel width; with the liquid surface tension increases, Taylor bubble and liquid column length increase, and the influence of liquid phase viscosity on bubble shape and thickness of two phase interface is more obvious than surface tension effects; the length of bubble and liquid column is mainly affected by the superficial gas and liquid velocities, channel diameter, surface tension, fluid viscosity and the volumetric flow rate ratio, and a predicting correlation for the length of bubble and liquid column based on simulation results was fitted, which was in good agreement with experimental results. The computer simulation methods in time and economy shows great advantages by experimental method, while avoiding human errors and not visible error routine experimental procedures, which laid the foundation for the subsequent simulation of flow and mass transfer in the microchaunels and microfluid reactors.

关 键 词：微型通道 Taylor流动 计算机模拟 预测关联式 

分 类 号：TQ021.4[化学工程]