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Fully developed velocity profiles, temperature profiles, mixed-mean-to-wall temperature differences, Nusselt numbers, and pressure drops are predicted for combined forced and free-laminar convective heat transfer in vertical round pipes. Uniform internal heat generation within the fluid may or may not be present, and a uniform heating or cooling at the tube wall is considered (including the case of the insulated wall). A comparison is made between the analysis and the small amount of experimental data available in the literature.

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