TED-AJ03-265 FLUID FLOW AND HEAT TRANSFER AROUND AN INCLINED RECTANGULAR CYLINDER
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Experimental investigations were carried out on the fluid flow and heat transfer around an inclined rectangular cylinder with a chord length c of 50 mm and an aspect ratio of 5/1. The angle of attack α was varied from 25°to 90°and the air stream velocity ranged from 6 to 20 m/s. The Reynolds number based on c was in the range from 19000 to 64000. The flow around the rectangular cylinder was visualized using a smoke tunnel and the pressure coefficient, the fluctuating pressure coefficient and the vortex shedding frequencies were measured. The flow on the top face is laminar wedge flow for α<40°, separated-reattached flow for 45°<α<55°and perfect separated flow for α>60°. The flow on the front face is always laminar. The bottom and rear faces are always exposed to separated flows. The characteristics of the wake flow of the cylinder correspond to the change of flow patterns. As α increases, the base pressure coefficient Cp decreases and the fluctuating pressure coefficient Cp' increases for α<60°. The wake Strouhal number S^*, defined by the wake width L_w and the velocity along free stream line at the separation point U_s, is 0.17 for α<60°and 0.14 to 0.15 for α>60°. The ratio of wake width to project width of the cylinder is constant at 1.56. The variation in the distribution of the local heat transfer coefficients around the rectangular cylinder with α are shown in Figure A-1. The overall Nusselt number is correlated by the Reynolds number defined by c : Nu_m=0.275 (Re_c)^<0.60>;α=25°to 90°(A-1) The average Nusselt numbers on the bottom and rear surfaces agree well with ordinary empirical or general equations for separated flow, <Nu>^^^-_<CD>=0.17(sinα)^<2/3>(Re_c)^<2/3> (A-2) <Nu>^^^-_<CD>=0.10[2/(L_w/L)(1-(Cp)_b)]^<1/3>(Re_c)^<2/3> (A-3) The average Nusselt number on the rear face is also correlated with the product of the square root of fluctuating pressure coefficient Cp' and Reynolds number shown in Figure A-2. <Nu>^^^-_<CD>=0.38(√<Cp'>Re)^<0.6> (A-4) [figure]
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