The convective heat transfer coefficient, hfp, between fluid and cubic particles was investigated with respect to flow rate, viscosity, and particle to tube dimension ratio using a moving thermocouple method. This study was conducted for a single particle. the determined values of hfp ranged from 199 W/m2C and 749 W/m2C. Results indicate that an increase in viscosity or dimension ratio decreased hfp values. In contrast, an increase in flow rate increased values of hfp. the effect of particle to tube dimension ratio was the opposite of those in previous studies by this method and appears to be due to differences inflow regime (laminar in this study, as compared to fully developed turbulence in previous work). A dimensionless correlation developed to relate Nusselt number to generalized Reynolds and Prandtl numbers, ratio of particle characteristic length and diameter of the tube, had an r2 value of 0.94.
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Zitoun et al. (1994) studied this question.
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