Yang Lei

Modification of Kinetic Theory for Granular Flow in Dense Gas- Solid System by including Friction

Lei Yang, J.T. (Johan) Padding, J.A.M. (Hans) Kuipers


Dense gas-solid flows have been the subject of intense research over the past decades. It is notoriously complex and its phenomena is difficult to predict. Continuum model, in which particles are treated as continuum phase interpenetrating with fluid phase, is currently only possible model that can be used to investigate hydrodynamics in industrial size reactors. My project involves the continuum level of modeling of dense granular flow, based on the kinetic theory of granular flow (KTGF). Until now, the KTGF has been well developed for slightly inelastic spheres for which only the normal coefficient is included. However, in dense system, the collisions between particles are very important and they have two types (sliding and sticking collision). Whether a collision is sliding or sticking depends on the collision angle.   And so far many researchers make a few assumptions in order to simplify the process, which may not be the real case.

First modify the current KTGF. Then incorporate the effect of friction between the particles in our current in house two-fluid model code, and at a later stage in the multi-fluid model. Validation of the modified KTGF model will follow from a comparison with the DPM model, in which friction can be modeled with reasonable accuracy, and also by comparing with one-to-one experiments.