Local and mean heat transfer on the leading and trailing surfaces of a square-sectioned duct rotating in the orthogonal-mode

The results of an experimental study of local and mean heat transfer over the leading and trailing surfaces of a square-sectioned duct which is constrained to rotate about an axis perpendicular to the main direction of through flow are described. Both radially outward and inward coolant flow conditions are considered. Physical arguments are discussed which explain the data trends found in terms of Coriolis-induced secondary flows and rotational buoyancy and these trends are compared with the corresponding problem in circular-sectioned tubes.