Laminar-Flow Heat-Transfer Coefficients for Ducts

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Abstract
In this paper, theoretically derived values of the heat-transfer coefficient for flat ducts with constant surface temperature are presented and compared with the corresponding results for round ducts which have been previously published. A few test data for air in flat ducts are compared with the theoretical results. For both flat ducts and round ducts the results are presented both in customary terms and in terms of the logarithmic-mean temperature difference. The latter results provide a consistent basis for comparisons with heat-transfer data for turbulent flow. Some limiting values of the local heat-transfer coefficient for both constant surface temperature and constant heat input per unit length are tabulated, and some equations pertinent to very short ducts are included.

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