Experimental investigation was carried out for fluid flow and heat transfer in the case of an elliptical duct rotating about a parallel axis using air as the working medium. It was found thai the increase in heat transfer (due to rotation relative to the stationary condition) for an elliptical duct lies between the values for a circular duct and those for a square duct for fully developed laminar and turbulent flows. It was observed that elliptical ducts are more advantageous from the viewpoint of heat transfer augmentation. © 1993 Taylor & Francis Group, LLC.