A CFD Analysis on the Influence of Upstream Surface Geometry Modifications of Clerestory Shaped Rib on Heat Transfer Characteristics of Solar Air Heater

Two-dimensional numerical analysis is conducted to determine the influence of upstream surface modifications a novel clerestory shaped rib turbulator on thermal performance augmentation. The divided into two parts where upper always normal incoming flow and lower surface, which inclined flow. elevation vertical varied using non-dimensional approach length (h/e=0, 0.25, 0.5 0.75), inclination angle (?=15°, 45° 90°). relative roughness height pitch fixed as 0.0421 12.5, respectively. RNG k-? turbulence model used in analysis, Reynolds number from 8000-20000. results reveal that combined effect impingement suppression formation recirculation zone leads increased heat transfer. Lower values provides higher enhancement factor. highest increase Nusselt found be about 1.82 times smooth duct at Re=8000 for h/e=0.25 15°. maximum factor have range 1.6-1.45 an 0.25