气泡粘度对水平槽道气泡减阻率影响的数值研究  

Numerical study on the effect of bubble viscosity on bubble drag reduction rate of horizontal channel

作　　者：张展[1] 庞明军[1] ZHANG Zhan;PANG Ming-jun(School of Mechanical Engineering, Changzhou University, Changzhou 213164, China)

机构地区：[1]常州大学机械工程学院,江苏常州213164

出　　处：《能源工程》2017年第6期1-7,共7页Energy Engineering

基　　金：国家自然科学基金资助项目(51376026);江苏省"青蓝工程"项目

摘　　要：采用多相流混合模型和雷诺应力湍流模型,对水平槽道气泡减阻进行了数值模拟;同时考虑了液相湍流诱导气泡聚合、气泡尾流诱导气泡聚合、湍流涡与气泡碰撞产生破碎作用对气泡减阻的影响。在保证雷诺数以及气相体积分数不变的情况下,调查了气相粘度变化以及气泡聚合、破碎物理因素对气泡减阻率和液相湍流的影响。研究表明:减阻率和液相湍流变化与气相粘度的大小具有直接关系;气泡减阻和液相湍流抑制是因气相粘度小于液相粘度而引起的,如气相的粘度大于液相的粘度时,液相湍流则被强化、气泡减阻现象消失;当气泡体积分数较低时,气泡聚合和破碎物理现象对液相湍流和减阻率的影响很小。The multiphase mixture model and Reynolds stress turbulence model were used to investigate drag reduction by bubbles in a horizontal channel. The liquid turbulence abduction bubbles coalescence,bubbles wake turbulence abduction bubbles coalescence,and turbulent vortex and bubble collision resulting in fragmentation were considered. Under the condition of the constant Reynolds number and the gas volume fraction,the effect of gas viscosity change,bubble coalescence and breakup,and breaking physics on bubble drag reduction rate and liquid turbulence modulation was studied. The present studies showed that the liquid turbulence modulation and drag reduction rate directly depended on the magnitude of the gas viscosity; the drag reduction did not happen and the liquid turbulence was enhanced when the gas phase viscosity was larger than one of liquid; the bubbles coalescence and breakup had very light influence on the liquid turbulence and drag reduction rate.

关 键 词：泡状流动 中等尺度气泡 混合模型 气泡减阻 气相粘度变化 

分 类 号：TQ021.1[化学工程]