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Table 4.2. For modeling ternary diffusion of gases in the adsorbent layer, an approach illustrated by Pahinkar et al. (2016) is adapted. This approach consists of calculation of an effective ordinary (molecular) diffusion coefficient using Chapman-Enskog theory as shown in Equation (4.4). 1.8581027 T1.5 1 0.5 Dij,eff ,ordinary Pd2 MW (4.4) ii The effective diffusion coefficient is then used to calculate the diffusion coefficient of a species in the ternary mixture using Equation (4.5) (Hines and Maddox, 1985). (4.5) Di,mix,eff ,ordinary ji Dij,eff,ordinary At the pressure at which the tests were conducted, Knudsen diffusion is also expected to be important. The Knudsen diffusion coefficient is calculated using Equation (4.6) (Cussler, 1997). Deff ,Knudsen dpore 8RuTw (4.6) 3 MWmix The effective total diffusion coefficient is thus calculated using Equation (4.7) from the ordinary diffusion coefficient and the Knudsen diffusion coefficient (Gholami and Talaie, 2009). 111 (4.7) Di,eff ,total Di,mix,eff ,Ordinary Deff ,Knudsen 1x i xj 117PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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