Mohammad Mehrabadi, Sudheer Tenneti, Shankar Subramaniam, Importance of the fluid-particle drag model in predicting segregation in bidisperse gas-solid flow, International Journal of Multiphase Flow, Volume 86, November 2016, Pages 99-114, ISSN 0301-9322, http://dx.doi.org/10.1016/j.ijmultiphaseflow.2016.07.006.
Abstract: The slip velocity between particle size classes in a homogeneous bidisperse gas-solid flow is quantified using particle-resolved direct numerical simulation (PR-DNS). This slip velocity is the key characteristic of size segregation in industrial devices. The ability of current gas-particle drag models to predict this slip velocity is examined by simultaneously solving the mean momentum equations for the gas phase and dispersed phases. PR-DNS of fixed particle assemblies is then used to validate and improve the bidisperse gas-particle drag model. The drag model inferred from bidisperse fixed beds is compared with the drag force measured from PR-DNS of freely evolving bidisperse suspensions. The ability of this new model to predict the slip velocity between particle size classes in a bidisperse gas-solid flow is also examined.
Keywords: Particle-resolved DNS; Bidisperse suspension; Gas-solid flow; Segregation; Drag law