规整填料内气相载荷对液膜流动特性的影响

Influences of gas load on hydrodynamics of liquid film flow over structured packings

为研究逆向气相载荷对规整填料表面液膜流动特性的影响,采用流体力学计算软件FLUENT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。针对Mellapak 250Y型金属板波纹填料表面不同气相载荷(F因子)对液膜流体动力学特性的影响进行模拟分析。研究各工况下液膜动态运动分布、气液两相流场结构、界面速度场分布特征,及相应持液量、有效界面传质面积变化分布规律。研究结果表明:气相速度对上述参数均有不同程度影响。

In order to study influences of the countercurrent gas load on the hydrodynamics of liquid film flow, a CFD model based on Navier-Stokes equations and VOF method was developed with software package FLUENT, and the turbulent structure was modeled with RNG k-ε model. The simulations were conducted to study the variations of liquid film hydrodynamics with countercurrent gas load（F factor） over Mellapak 250 Y corrugated packing sheet. The analysis was mainly focused on the transient motions of liquid film, gas-liquid two-phase flow structure, velocity fields distribution feature along interface, and corresponding liquid holdup and effective interfacial area. The results show that the counter current gas flow velocity has great influence on the previously mentioned parameters.