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2.2.6 Sequential coupling and full process simulation methodology In the complete purification process model, the sub-models (i.e., adsorption, displacement of gas by liquid, desorption, cooling, displacement of liquid by gas, and purge) are coupled sequentially as shown in Figure 2.4. A switching technique is used to activate the relevant governing equations during the transition from one stage to another. The governing heat and mass transfer equations are modified using the binary switches and equivalent resistances. Each stage is assigned a switch that assumes a value of either one or zero, depending on whether the stage is being simulated at that time or not. The overall microchannel domain species equation used for the full process simulation is shown in Equation (2.22), where S indicates the switch for a corresponding stage of the process. Similar treatment is given to the other conservation equations for the full process model. Cg,i uCg,i t z S S X S X S D 2C Ads LDG G GDL G Purge A,G,i g,i (2.22) S SXSSSX1 L due to different approaches adapted for single-phase (adsorption, desorption, cooling, and purge) and two-phase flows (displacement of gas and displacement of liquid) to calculate the fluid velocity in the microchannel. z S S X S X S 1 2 X S LDG L deso S AdsLDGGGDLGPurgeR S eq,Mass,G,i X D GDL L A,L,i LDG L deso Cool GDL C C g,i w,i 0 Ag Cool Req,Mass,L,i The momentum equation, however, assumes the form shown in Equation (2.23), 37 PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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