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form agglomerates, which act as larger particles when the strong interaction forces between the particles overcome the forces of gravity and drag. It has also been suggested the estimate of γ1 in equation 3.15 is much larger (~50 for a rectangular isotherm) for strongly adsorbing particles. The proposed higher value accounts for direct transport through the particle due to an asymmetric concentration profile surrounding the particle at low gas velocity.50 As a result, the amount of effective axial dispersion increases in the laminar and transitional flow regimes. While this apparently has an impact in liquid chromatography where the influence of surface diffusion is significant at low velocity,51 it has not been demonstrated to be applicable for gas adsorption systems. The value of ~ 0.7 for γ1 currently remains the best estimate for such systems. Figure 4.1 Limiting Peclet number vs. particle diameter for flow through packed beds26 54PDF Image | LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION
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