Multiscale Modeling Of A Gas Separation Device - 954 Words

Multiscale modeling of a gas separation device based on e ect of thermal transpiration in the membrane Vasily Kosyanchuka,b,, Valery Kovaleva,b, Artem Yakunchikova,b aLaboratory of Nanomechanics, Institute of Mechanics, Lomonosov Moscow State University, Michurinskyi aven. 1, 119192, Moscow, Russian Federation bDepartment of Mechanics and Mathematics, M.V. Lomonosov Moscow State University, Leninskie Gory 1, 119991, Moscow, Russian Federation Abstract This article studies a novel approach to improve membrane separation e- ciency { application of external physical in uence (temperature dierence across the membrane). Oppositely directed pressure and temperature gradients in membrane establish a molecular exchange ow when two components of the binary gas mixture ow in the opposite directions through the membrane. The model of gas separator based on this eect is studied numerically at dierent scales. At microscale (in membrane channels) solution of the linearized Boltz- mann equation is used. At macroscale (external part of the device) the system of Navier-Stokes equations for two-component gas mixture is solved using nite volume method adopted for low Mach number limit. Dependence of device e- ciency on all of the dening parameters is studied and comparison with previous numerical simulation of the device is made. The key feature of the device is that it can produce output gas with any purity up to 100% with temperature dier- ence of only 30K applied to the sides of