مصطفي كمات قشمي

In this study, two immiscible fluids (water and edible oil) hydrodynamic in a microchannel with a helical barrier were studied by using Fluent software. Three different inlet configurations and three barrier lengths were considered. Geometry was built by a Design modeler in all cases. To mesh the fluid domain Ansys Meshing used. The number of nodes in the microchannel without barrier number was approximately between 100000 and 200000, while Due to the more complexibility of a microchannel with a barrier, the number of nodes was around more than 500000 and in some cases exceeded 700000 nodes for each simulation. A Mesh independence study was also done to eva‎luate and reach the desired result. Parameters like slug length, distance between slug, pressure drop, and surface Area are determined in cases with barrier and without barrier. for the governing Equations, we use the VOF method which is so useful for multiphase flow and has previously been used by numerous researchers in similar issues. velocity range differs from 0.001657 to 0.013256 meters per second, and the ratio of the two phases varies from 0.25 to 4 in some cases. for all simulations as velocity increases drop length and distance between slug decrease, and as velocity exceeds 0.006628 meters per second the pattern changes to annular and no more slug generates. Another Parameter that was studied was inlet configuration which has no significant effect on flow pattern, Pressure drop, or another parameter. barriers effect strongly on pressure drop, vorticity, and slug length. by decreasing barrier length pressure drop increases, consequently, a barrier with 1.1mm length shows maximum pressure drop. Vorticity was enhanced significantly by using a barrier in a microchannel that may cause improved mass transfer for a system in which one species transfers from one liquid to another. surface area between two phases compared for cases with or without barriers. a barrier with lengths of 1.1mm and 4.4mm has a negligible effect on surface area between two phases, while barrier with length of 2.2mm increases surface area by 17.1 on average.

ميكروكانال، مدل حجم سيال، ديناميك سيالات محاسباتي، جريان دو فازي

Microchannel, VOF, CFD, Two phase flow

mostafa kamat qeshmi

mohammad amin sobati, salman movahedirad