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B. DECOUPLED MOMENTUM APPROACH AND PROPERTY VARIATION The use of a single set of coupled momentum, energy and species equations for the entire microchannel during displacement stages results in an inaccurate gas-liquid interface. This is because the liquid numerical property data are transferred across the interface to the gas region, and because of this numerical diffusion, as the time step progresses, the interface location becomes undetectable. This condition is depicted in Figure B.1, where there is no clear location across which the liquid density transitions quickly to the gas density, resulting in an unrealistic displacement scenario. This also poses difficulties in the timing of the stages, as the time instant when the interface reaches a specific axial location in the microchannel cannot be determined with certainty. Furthermore, from the experimental observations by Moore (2012) as shown in Figure B.2, gases in the microchannel are cleanly displaced by liquid. The decoupled momentum approach allows precise calculation of thermo-physical properties of working and coupling fluids, and tracking of the gas-liquid interface. Figure B.1. Instantaneous density variation during displacement of gas assuming a homogeneous mixture. 175PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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