微反应器流道内单气泡逸出动力学模拟  

Numerical Simulation of a Gas Bubble Emerging from a Pore into Liquid Flowin Mini- reactor Channel

作　　者：季炜 周吉[2] 吴太军 

机构地区：[1]重庆三峰环境产业集团有限公司国家环境保护垃圾焚烧处理与资源化工程技术中心,重庆400084 [2]哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨150001

出　　处：《节能技术》2015年第4期303-307,共5页Energy Conservation Technology

基　　金：国家863计划资助项目(No.2012AA063505)

摘　　要：采用VOF方法,对不同流道结构下液体通流微小通道内壁面逸出气泡的形成、生长及脱离运动进行了数值模拟,讨论了槽道高宽比对气泡动力学行为的影响。结果表明:流道截面积不变时,气泡的脱离体积、脱离时间随槽道高宽比的减小呈现先增大,后减小的趋势,当高宽比为2时,气泡的脱离体积、脱离时间、槽道容积含气率和流动阻力因子均达到最大值。The dynamic behavior of a gas bubble entering the liquid flow mini - channel with different channel geometry through a pore with prescribed mass flow rate was simulated by using computational flu- id dynamics in conjunction with volume of fluid （VOF） method. Simulations of the processes of gas bub- ble emergence, growth, deformation and detachment were performed to explicitly track the evolution of the liquid - gas interface, and to characterize the dynamics of a gas bubble subjected to water flow in terms of departure volume, departure time, volumetric fraction of gas and flow resistance coefficient. The effects of aspect ratio for the rectangle and cross - section shape of the liquid flow mini - channel were discussed. The simulated results showed ： under the same cross - sectional area conditions, the departure volume and departure time firstly increased and then decreased with decrease of aspect ratio, the bubble departure volume, departure time, volumetric fraction and normalized friction coefficient reached the maximum at an aspect ratio of 2.

关 键 词：气泡 动力特性 阻力因子 截面形状 小槽道 

分 类 号：TM911.4[电气工程—电力电子与电力传动]