Heat transfer in homogeneous multiphase flows
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Homogeneous multiphase systems can be subdivided into identical characteristic volume cells containing one dispersed element, e. g. one solid particle or one gas bubble, and the surrounding fluid. Consequently, the flow condition in homogeneous multiphase flows can be traced back to the flow in the characteristic volume cell of the system considered. Application of this model to fluid dynamical calculations has been successfully demonstrated for particulate fluidization, fixed beds, homogeneous bubble columns and the stirring of suspensions . In all these cases the flow around the dispersed element in the cell was analysed and calculated using the Navier-Stokes equation. Because the multiphase system contains only identical cells, the solution of the equation for one cell could be transferred very easily to the whole multiphase system, producing a physical description of the overall behaviour of the system. This approach cannot be applied to segregated multiphase systems such as bubbling and circulating fluidized beds.
KeywordsHeat Transfer Heat Transfer Coefficient Continuous Phase Multiphase Flow Bubble Column
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