Modeling of Particle Layer Deposition, Shear, Saltation and Heat Transfer in a High Mass Loading Gas-Particle Flow

We extend our previously published Eulerian model for the heat transfer of a highly mass loaded high Reynolds number particle-laden pipe flow. In high pressure co-flowing nitrogen-copper powder experiments that preceded this effort, it was observed that copper particles accumulated on the bottom of flow channel. Accordingly, we extend the two-field (gas+disperse particles) model to a three-field model (gas+disperse particles+wall bounded particle layer). This requires incorporation of deposition and saltation mass transfer models between the disperse and near-continuous layer fields. A drag model to account for the drag between this particle layer and the carrier gas is introduced, as is an attendant interfacial heat transfer model. In this presentation we provide details of the complete three-field model with emphasis on the particle layer mass, momentum and energy inter-field transfer. We apply the 3-field model and compare its Nusselt number performance to a two-field model that neglects the copper powder buildup, and experimental measurements carried out by our group.