Computational fluid dynamics simulations of heat transfer between the dense‐phase of a high‐temperature fluidized bed and an immersed surface

Abstract

The transient process of heat transfer between a high-temperature emulsion packet and the wall of an immersed surface is simulated using computational fluid dynamics (CFD). From these simulations, the total heat transfer coefficient and its radiant contribution due to the emulsion (dense) phase are evaluated. The results are compared with experimental data (Ozkaynak et al., An experimental investigation of radiant heat transfer in high temperature fluidized beds, in Fluidization IV, 1983, 371 - 378) and with predicted values from the generalized heterogeneous model (GHM), (Mazza et al., Evaluation of overall heat transfer rates between bubbling fluidized beds and immersed surfaces, Chem Eng Commun., 1997;162:125-149). The CFD simulations are in good agreement with both, experimental data and theoretical GHM predictions and provide a reliable way to quantify the studied heat transfer process. Also, the GHM is validated as a practical tool to this end.