Abstract
Laminar heat transfer in the entrance region of a circular duct and parallel plates is presented. The velocity profile is fully developed and the temperature is assumed to be uniform at upstream infinity. The finite difference equation for the energy equation, accounting for axial conduction, was solved by ADI and QUICK methods and the results extrapolated to zero mesh size with extended Richardson extrapolation. The local Nusselt number, incremental heat transfer number and thermal entrance length are presented for Pe between 1 and 1000; and for constant wall temperature and constant wall heat flux boundary conditions. Accurate engineering correlations for the Péclet number effect on these quantities were also obtained.
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