An Experimental Investigation of Heat Transfer from the Inside Surface of a Hot Smooth Tube to Air, Helium and Carbon Dioxide

Abstract

This Report gives experimental values of Nusselt number as a function of Reynolds number and surface/gas temperature ratio for three gases, air, helium and carbon dioxide, and shows the effects of radial variations of fluid properties with temperature. The conditions under which the experiments were performed were fully developed velocity and temperature profiles and subsonic turbulent flow. These conditions are typical of those encountered in the cooling passages Of a nuclear reactor or a turbine blade. The experimental results are presented in a form suitable for use in design work and are compared with existing experimental and theoretical data.