Numerical solutions are obtained to predict the three dimensional fluid flow and heat transfer in a strongly curved duct. Elliptic calculation procedure is adapted to investigate a existence of reversed flows. The calculated results are verified by comparing with main streamwise velocity profiles of Humphrey's experiment.
In limited regions, reversed flows are shown so that Rhie's partially parabolied numerical solutions agree well with a present calculation. The mean nusselt number for a straight duct is larger than for a curved duct at a entrance region but, due to the secondary flows resulting from the centrifugal force, the opposite trend occurs as the main streamwise path increases.
