A detailed review and analysis of the hydrodynamic characteristics of laminar developing and fully developed flows in noncircular ducts is presented. New models are proposed, which simplify the prediction of the friction factor–Reynolds product f Re for developing and fully developed flows in most noncircular duct geometries found in heat exchanger applications. By means of scaling analysis it ...

This paper presents the results of an experimental investigation of heat transfer to the airflow in the square duct. The main purpose of this study is influence of square ducts on the convective heat transfer mechanism. Under this investigation friction factor and the Nusselt Number were calculated. The reason that square ducts increase the fluid flow turbulence near the wall and also increase ...

Solar air heater acts as one of the important components in utilization solar energy. The absorbs irradiance and converts it into heat energy at absorbing surface. thermal is further use heating flowing through duct. heaters are cost effective well simple design. can be used space heating, timber seasoning agricultural drying. In spite all these advantages has certain challenges such low transf...

This paper present the experimental inquiry on heat transfer and friction features enrichment adopting new-fangled of three side’s synthetically rugged rectangular duct solar air heaters (SAHs). The roughened SAH ducts has been an arrangement multi-v transverse wire (top wall two side walls transverse) covered with glass sides. It various appliances such as crop drying, seasoning timber, space ...