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Monodisperse drag laws have been traditionally employed in polydisperse systems using ad hoc assumptions due to the lack of adequate drag laws for polydisperse systems. A key component of both continuum and discrete models used to study segregation in gas fluidized beds is the drag law. In this work, both the ad hoc approach and a new drag treatment developed specifically for polydisperse mixtures...
The drag law proposed by Gidaspow (1994, Multiphase Flow and Fluidization, Academic Press, p. 35–37), which is a combination of the Ergun (1954, Chem. Eng. Progress, 48, p. 89–94) and the Wen and Yu (1966, Chem. Eng. Progr. Symp. Ser., 62, p. 100–110) empirical correlations, has been widely used in the literature. Physically, the drag is known to be a continuous function of both the solid volume fraction...
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