Abstract
ABSTRACT The thermal efficiency of the solar air heater (S.A.H.) is enhanced by introducing various artificial roughness geometries on the absorber surface. Artificial roughnesses in the form of a chamfered rib, right angle triangular and reverse L-shaped ribs, invented from square rib are presented. A comparative thermohydraulic analysis of these ribs is carried out using experimental, Computational Fluid Dynamics (C.F.D.) and analytical investigation. The experiments are carried out using rib height (e = 0.7,1 and 1.4), relative roughness pitch (P/e = 7.14 to 35.71), relative roughness height (e/D = 0.021, 0.03 and 0.042), Reynolds number (Re = 3800 to 18000) and duct aspect ratio (W/H= 5).The effect of rib shape, rib height (e), pitch (P), relative roughness pitch (P/e), relative roughness height (e/D), chamfer angle (α) and Reynolds number (Re) on heat transfer and friction flow is evaluated. Experimental results are validated using C.F.D. code ANSYS FLUENT 14.5, by simulating two-dimensional computational domain of roughened S.A.H. Based on the experimental results correlations for the Nusselt number and friction factor are derived. A mathematical model has been developed to investigate the effect of geometrical and operating parameters on the thermal and effective efficiency of a roughened S.A.H.
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