Mazzei, Luca; (2019) Recent Advances in Modelling Gas-Particle Flows. In: Yeoh, GH, (ed.) Handbook of Multiphase Flow Science and Technology. Springer: Cham, Switzerland.

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Abstract

This chapter is concerned with the mathematical modeling of dense fluidized suspensions and focuses on the so-called Eulerian or multifluid approach. It introduces newcomers to some of the techniques adopted to model fluidized beds and to the challenges and long-standing problems that these techniques present. After introducing the principal approaches for modeling fluid-solid systems, we focus on the multifluid, overviewing the main averaging techniques that consent to describe granular media as continua. We then derive the Eulerian equations of motion for fluidized powders of a finite number of monodisperse particle classes, employing volume averages. We present the closure problem and overview constitutive relations for modeling the granular stress and the interaction forces between the phases. To conclude, we introduce the population balance modeling approach, which permits handling suspensions of particles continuously distributed over the size and any other property of interest.

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