Abstract
A numerical analysis is made of laminar free convection in vertical ducts with Uniform Heat Flux, in consideration of temperature-dependence of fluid thermophysical properties. The local Nusselt number of Constant Property Solutions can be wall correlated with the dimensionless parameters derived by the authors, regardless of the exit Rayleigh number, Prandtl number, and circular tube or parallel plates. The CPS of free-convective heat transfer is close to that of forced convective heat transfer in UHF-dusts. The local Nusselt number of Variable Property Solutions can be well correlated by the usual correction method used for forced convective heat transfer in duct. The difference in the heat transfer characteristics of UHF-ducts between CPS and VPS in not so large as those of Uniform Wall Temperature ducts.
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