Abstract
Abstract The fully established friction factors and heat transfer coefficients of the turbulent flow of water in a 150-hydraulic-diameters-long, 5:1 rectangular duct were measured experimentally. The bottom wider wall was heated by passing direct electric current through it, yielding constant wall temperature (spanwise) and uniform heat input per unit length along the bottom wall. The other surfaces were adiabatic. The measured turbulent Fanning friction factors are in good agreement with the Blasius equation. Spanwise-averaged, fully established turbulent local Nusselt values for water over a range of the Reynolds number from 10,000 to 50,000 for the case of asymmetric heating are about 11% below the values for symmetric heating. This observed decrease in the heat transfer is in good agreement with the available turbulent heat transfer results in asymmetrically healed rectangular channels. Assuming that the Dittus-Boelter equation yields a reasonable estimate of the turbulent Nusselt values in symmetrica...
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