液相物性对规整填料内气液二相流的影响  

Influences of liquid properties on gas-liquid two-phase flow in structured packings

作　　者：李相鹏[1] 汪蓉梅[1] 

机构地区：[1]浙江工业大学机械工程学院,浙江杭州310032

出　　处：《化学工程》2014年第1期40-44,共5页Chemical Engineering(China)

基　　金：浙江省自然科学基金项目(Y20110169)

摘　　要：运用商用流体计算软件FLUENT6.3,建立基于Navier-Stokes方程和VOF方法相结合的CFD分析模型,湍流结构模拟采用RNG k-ε模型,研究了液相物性参数对规整填料内气液二相流体动力学特性的影响。采用文献实验测试结果对该模型进行了验证。重点研究了在一定逆向气流速度条件下液相密度和黏度等物性参数对液膜流动的影响。结果表明:在分析的液相物性参数变化范围内,填料表面均能形成一层稳定的液膜流,气相流场分布也基本一致。液相密度增加,界面液相速度均值增大,沿界面速度值波动幅度降低,填料持液量减小。液相黏度增大,界面液相速度均值减小,持液量增加。2个物性参数改变时,有效界面传质面积均保持在一定值范围内波动。The influences of liquid physical properties on the hydrodynamics simulation of gas-liquid flow in the structured packings were simulated with commercial CFD software package FLUENT6.3. A CFD model based on Navier-Stokes equations and VOF method was developed, and the turbulent structure was modeled by RNG model. The model was validated by the experimental results presented in literature. The effects of liquid density and viscosity on the liquid film flow at a constant counter-current gas flow velocity were studied. The results show that in the variation ranges of liquid properties considered, a stable liquid film flow can form over packing surface, and the gas flow fields are similar. With the increment of liquid density, the average velocity of liquid free surface increases, and along the free surface, the fluctuation of velocity values decreases; meanwhile the liquid holdup decreases as well. As liquid viscosity increases, the average velocity of liquid free surface decreases and the liquid holdup increases. The variation of liquid properties has little impact on the effective interfacial area.

关 键 词：液相物性 规整填料 气液二相流 持液量 有效界面传质面积 

分 类 号：TQ021.1[化学工程]