Abstract
Analytical solutions are obtained for fully developed vertical laminar mixed convection flows within annular and conventional rod bundle subchannel geometries. Friction factors and Nusselt numbers are presented and fitted as functions of Grq/Re. A modified friction factor is defined to be used in applications where only bulk-averaged fluid temperatures are available, as in the case of lumped parameter analyses and most one-dimensional experiments. It is shown that the modified friction factor can vary significantly from the standard definition, which highlights the necessity of using the modified friction factor in analyses where the bulk density is used to calculate the gravity component of the axial pressure gradient. Finally, the present analysis is compared with experimental data available in the literature.
Published Version
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