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Abstract
The conservation equations for developing laminar free convection in a vertical annulus open at both ends are solved by a boundary layer-type, marching, finite-difference scheme. Two boundary conditions are considered: uniform (but different) temperature on each wall (UWT) and uniform (but different) heat flux at each wall (UHF). Results are presented for the flow rates drawn through the channel for both boundary conditions, the heat transfer from the inner wall for UWT, and the maximum wall temperatures for UHF, all for a Prandtl number of 0.7. It is found that the larger the annular gap, the higher the heat transfer for a given length. For small spacings, the results can be correlated by equations independent of the spacing.
