Heat transfer from turbulent air flowing through a cooled isothermal tube

William S. Janna, Tony El-Nar and David Alciatore

Applied Energy, 1991, vol. 38, issue 2, 143-156

Abstract: A device was constructed to establish turbulent flow of air in a constant wall-temperature copper tube. The flow was fully developed hydrodynamically but developing thermally. Data on flow rate and fluid temperatures were obtained and reduced to an expression for Nusselt number as a function of Reynolds and Prandtl numbers. An existing equation for developing flow was tested in order to determine how well it fitted the data. The derived equation of this study has a correlation coefficient of 0·974 and a standard deviation of 6·03.

Date: 1991
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