Fully developed turbulent flow and heat transfer characteristics of concentric annular passages have been analysed through finite difference technique in this paper. The turbulence is treated by Reichardt's model Thermal solutions are obtainedwith uniform heat flux on the inner wall while the outer wall is insulated. Attempts are made to determine a suitable expression for the turbulent Prandtl number. The friction factor and Nusselt number values are computed for different radius ratios andReynolds numbers. Satisfactory agreements are observed in comparison with literature information.
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