Abstract
A calculation procedure for flow and heat transfer in ducts of annular cross section is described. This procedure is applied to study heat transfer in the laminar flow of water and ethylene glycol in vertical ducts. When only one wall is heated the effect of buoyancy is to cause a flow reversal, the onset of which is well predicted by the calculation method. An improved correlation parameter for this flow regime is identified. Results are also presented for a turbulent flow using a turbulence model that utilizes the turbulence kinetic energy as a parameter.
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