Turbulent heat transfer in a circular tube with circumferentially varying thermal boundary conditions

Abstract

An analysis has been carried out to determine the heat-transfer characteristics for turbulent flow in circular tube with circumferentially varying boundary conditions of first and second kind. Fully developed flow and heat transfer is considered. Contrary to prior investigations of this problem, anisotropy of turbulent energy transport has been taken into account employing theoretical results for eddy diffusivity in the various directions from an analysis of Ramm and Johannsen which are shown to be in satisfactory agreement with recent experimental data. Results for heat transfer at both constant and varying boundary conditions are presented over a wide range of Reynolds number (if10 4⩽ Re ⩽10 6) and Prandtl number (0 ⩽ Pr ⩽ 100) and compared to empirical data.