Influence of Thermal Boundary Conditions on Heat Transfer in Turbulent Annular Pipes

ABSTRACT Turbulent concentric annular pipe flow with heat transfer is investigated using the stochastic one‐dimensional turbulence (ODT) model. In the present study, annular pipe flow is investigated at fixed bulk Reynolds number and Prandtl number using two different thermal boundary conditions: uniform heat flux (UHF) and constant temperature difference (CTD). Present (preliminary) results suggest that heat transfer under CTD conditions exhibits a stronger dependence on geometry than under UHF conditions. This behavior appears to be induced by wall curvature, which leads to an increased radial flow and temperature profile asymmetry, resulting in enhanced heat transfer at the inner wall compared with the outer wall.