The hydraulic characteristics of gas-liquid two-phase flow in distillation process are important factor for separation efficiency.With water and air as working medium

a CFD model based on Navier-Stokes equations

RGN k-ε turbulent model and two-phase model of volume of fluid is employed to analyze the hydraulic characteristics of liquid film flow on the structured packing surface at normal temperature and pressure.The model and simulation method are validated by experimental results in literature.The spatial and temporal evolution of liquid film

velocity fields and influences of liquid mass flow rate are simulated and analyzed.Liquid will accumulate below the peaks of corrugation

forming a drop.At valleys

the liquid drop spreads and the film thickness increases

and as it reaches the upper slope of the next corrugation

the drop appears again.The instantaneous liquid film thickness oscillates with time.Along the packing surface the volume-averaged film thickness decreases first

and then keeps stable.Liquid accumulation and dropping have an important effect on the form of dry batches.The velocity profile within the bulk of film varies significantly at different positions of corrugation

and along the packing surface

the average velocity of liquid film increases first

then decreases or keeps stable.The liquid film will accelerate at the convex of corrugation and decelerate at the concave.With the increment of liquid mass flow rate

the average film thickness and velocity increase.