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k Tw k Tw 0 (2.13) wz wz At the end of the adsorption stage, the hot HTF enters the microchannel to heat the adsorbent and desorb CO2. The hot HTF accomplishes three tasks: the displacement of the residual gases from the microchannel, heating of the adsorbent layer, desorption of gases from the adsorbent, and the removal of the desorbed gases from the channel. The model of the residual gas displacement with the hot HTF is separated from the desorption stage model to simplify the implementation of the complete process model. Although the boundary conditions for these two scenarios are identical, the presence of two different phases requires independent analysis of the displacement phenomenon. An approach with decoupled momentum and heat/mass transfer in the microchannel is used, where the displacement of gas by liquid is simulated on a dynamic mesh using simplified momentum equations. The heat and mass transfer in the microchannel and the adsorbent layer, however, are analyzed on a fixed mesh. Logical statements are introduced to distinguish between liquid and gas nodes, so that the heat and mass transfer kinetics are simulated separately for these regions. The liquid-gas interface location is explicitly imported into the heat and mass transfer models. The effect of mass transfer into the microchannel is neglected, because the desorbed gases constitute only 4% of the mass of gas-liquid mixture present in the channel. This methodology accurately simulates heat and mass transfer during displacement while maintaining stability and substantial details in the modeling equations. Details of the fluid displacement modeling and experimental validation are described by Moore et al. (2016). 2.2.2 Displacement models z0 zL 28PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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