The prediction of turbulent flow and heat transfer in a narrow isosceles triangular duct

Abstract

Predictions are described of fully developed turbulent flow and heat transfer in a narrow isosceles triangular duct obtained by means of a computer model in which the Reynolds stresses are calculated from algebraic forms of their transport equations, first derived for square duct calculations. THE governing equations are formulated in an orthogonal curvilinear coordinate frame which is fitted to the shape of the duct cross-section, and are solved by an efficient finite volume method. The solutions presented show that, for the conditions of the small apex angle duct examined, the local and overall heat transfer is relatively unaffected by secondary flow, whilst being quite sensitive to the imposed temperature boundary conditions. The predictions compare satisfactorily with the experiments and were found also to be useful in interpreting them.