Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Determination of Convective Heat Transfer for Subsonic Flows over Heated Asymmetric Airfoil NACA 4412

Get access (open in a dialog) DOI: 10.1615/IHTC15.fcv.009266
pages 3261-3275

Abstrakt

An experimental study of convective heat transfer on an asymmetric airfoil standard NACA4412 is conducted under subsonic flow regime. The experimental work is conducted in an open circuit-Eiffel type wind tunnel, powered by a 37 kW electrical motor that is able to generate subsonic air velocities up to around 41 m/s in the 24 square–inch test section. The airfoil model surfaces are subjected to constant heat flux using flexible heating pads. The top and bottom surfaces of the airfoil are instrumented at given points using hot film temperature sensors to determine heat transfer characteristics over the upper and lower surfaces. The monitored temperature data are utilized to determine the convective heat transfer coefficient of forced convection over the surfaces by empirically correlating the Nusselt Number (Nu) with Reynolds number (Re) and Prandtl number (Pr) in both laminar and turbulent flow regimes. The effect of Nusselt number with varying angle of attacks ranging from 0o to 20o is also investigated. It is seen that the average Nusselt number varies on the upper surface as well as lower surface of the airfoil as a function of the Reynolds number and angle of attack. It is concluded that Nusselt number increases with increasing Reynolds number and while there is a limiting increase in angle of attack on the upper and lower surface of the airfoil.