Prediction of the heat transfer in circulating fluidized beds without considering the influence of radiation
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The non-dimensional plot of the experimentally determined heat transfer coefficients in the form of Nusselt number versus Archimedes number reveals that the thermal properties of the solids have no influence on the heat flux transferred (Fig. 14.5). For example, glass beads with a particle size of 58.5 μm at 50 bar (5 MPa) static pressure have the same Archimedes number as bronze particles with a size of 63.7 μ at 10 bar (1 MPa) static pressure. The corresponding Nusselt number for the same pressure drop number is the same for the two gas/solid systems. This means the particles do not limit the heat transfer by their thermal properties.
KeywordsHeat Transfer Reynolds Number Heat Transfer Coefficient Nusselt Number Minimum Fluidization
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