Research On Mixing Performance Of Winpak

In this paper,the liquid-liquid single-phase mixing process,enhanced mixing mechanism and liquid-liquid two-phase mixing process of Winpak packing were studied by experimental and computational fluid dynamics（CFD）methods.Firstly,a set of liquid-liquid mixing performance measurement device was designed and built to test the mixing performance of Winpak filler in the liquid-liquid single-phase mixing process with the same density and viscosity.The standard k-ωturbulence model is selected to establish the CFD model of liquid-liquid single-phase mixing process.Compared with the experimental results,the simulation results are in good agreement with the experimental values,which verifies the accuracy of the CFD model,which can provide a model basis for the follow-up simulation research.Then,the pressure drops and coefficient of variation（COV）with flow rate were investigated by CFD method.At the same fluid viscosity,the pressure drop of Winpak packing increased by 227.1%,and the Co V decreased by 2.8%.With the increase of turbulence degree,the pressure drop of mixing process increases and the mixing performance also improves correspondingly.With the increase of glycerol content in the liquid-liquid single-phase system,the liquid viscosity gradually increased,the system pressure drop increased,and the Co V value increased accordingly.When the liquid phase flow rate is 3.02%,the liquid phase pressure drop is 3.02%higher than that of pure glycerol in the liquid phase.Compared with different structured packing units,the average pressure drop of Winpak packing is 15.0%higher than that of plate corrugated packing,and the Co V value is reduced by 24.1%.The internal simulation results of Winpak packing show that the Co V value gradually decreases along the flow direction,and the position where the Co V value drops sharply is in the same section as the windowed structure of Winpak filler.The results show that the windowed structure of Winpak filler can increase the radial velocity of liquid phase in a larger flow region,and enhance the mixing process.The results show that Winpak filler can promote the liquid-liquid single-phase mixing process,and the windowing structure of Winpak filler is the main reason for its enhanced mixing effect.Finally,based on the liquid-liquid single-phase mixing device,the liquid-liquid two-phase mixing process of different structured packing units was studied.Kerosene was selected as the dispersed phase and water as the continuous phase.The pressure drops of Winpak packing and the droplet diameter after mixing were measured.Sauter average diameter(d₃₂)was used to characterize the mixing effect.With the increase of flow rate,the pressure drops of Winpak packing increases,while d₃₂decreases gradually.With the increase of dispersion fraction,the pressure drop of Winpak packing did not change,but d₃₂ increased to a certain extent.Compared with different structured packing units,the average pressure drop of Winpak packing is 59.6%higher than that of plate corrugated packing,and that of d₃₂ is 6.2%lower.The results show that Winpak filler can also promote the mixing process of liquid-liquid single phase.