Experimental investigation on convection heat transfer characteristics of flat plate under environmental wind condition

Abstract

ABSTRACTBy establishing wind tunnel and employing electrical heating method, the heat transfer characteristics of flat plate were investigated under environmental wind condition. Both the uniform and linear heat flux boundary conditions were adopted for comparison purpose. Besides, the impacts of heat flux qwm, tilt angle α and wind incidence angle θ on heat transfer were explored in cases of windward and leeward facing positions. The local convection heat transfer coefficient hcx and average convection Nusselt number Nucm were obtained. The results show that, when α is small, there are two maximum values of hcx under linear heat flux boundary condition. As for Nucm, differences between the two boundary conditions seem indistinctive. At windward orientation, Nucm is not sensitive to α. While for leeward orientation, Nucm has a rapid decline progress with the increasing α, which indicates the tilt angle α is an important parameter to affect the heat transfer of plate. Finally, new correlations of Nucm have been developed, which were proven effective in engineering applications.