Three-dimensional simulation of turbulent flow in a membrane tube filled with semi-circular baffles

As qualitative and quantitative properties of fluid dynamics in baffle-filled channels can be obtained through computational fluid dynamics (CFD) simulations, the effects of types of baffles on flow patterns, behavior and features can be fully understand. In this research, a three-dimensional (3D) simulation method based on CFD was applied for fluid flow in membrane tubes in which semi-circular baffles were inserted. In addition, the effects of flow geometric parameters on turbulent flow in a membrane tube equipped with semi-circular baffles were studied, and parameters involving pitch to baffle diameter ratio (L/D = 1, 2 and 3) and baffle orientation angle (β = 90° and 180°) were considered. According to the obtained results from 3D simulation, it was found that the fluid average velocity, shear stress and mass transfer on the tube wall increased by further extension of the baffle angles from 90° to 180°. Subsequently, the filtration performance in these types of tubes was significantly improved by this arrangement. In addition, the obtained results from the simulation were in good agreement with the experimental data in a cross-flow micro-filtration process of calcium carbonate suspensions.

After three-dimensional (3D) simulation based on CFD for the fluid flow in the membrane tubes in which semi-circular baffles were inserted, it was found that the fluid average velocity, shear stress and mass transfer on the tube wall increased by extension of the baffle angles from 90° to 180°. In addition, the filtration performance was significantly improved by the new arrangement.Figure optionsDownload as PowerPoint slideHighlights
► Fluid velocity, shear stress and mass transfer on tube increase by extension of baffle angles.
► Baffle with orientation angle of 180° obtains higher wall shear stress and filtration flux.
► Results from simulation are in good agreement with the experimental data.
► Increment of wall shear stress promotes filtration flux and pressure drop enlargement.