Discrete particle simulation of a spout-fluid bed: treatment of two-way coupling and effect of drag closure

A new method is proposed to map properties between the Lagrangian and Eulerian grid in a discrete particle model. The model was used to study the gas-particle flow in a spout-fluid bed and assess grid independency of the computations. Comparison between experimental and numerical results using various drag models revealed that the most frequently used drag model (i.e. the Ergun equation for low porosities and the Wen and Yu relation for high porosities) is less suitable for modeling fluid beds with stable high velocity jets, as encountered in spout(-fluid) beds. The Koch and Hill (2001) relation and the minimum of the relations of Ergun, and Wen and Yu are more suitable, although the former is preferred because of its more fundamental basis