Heat transfer and friction in a high aspect ratio rectangular channel with angled and intersecting ribs

• Forced convection heat transfer in a rectangular channel with angled ribs is studied. Longitudinal have been inserted order to improve thermal performance. Friction/heat characteristics are experimentally and numerically evaluated. One longitudinal rib at the midline increases Two not found further increase high aspect ratio (5:1) 45 deg has investigated. The periodically positioned on one wall of channel, heated uniform flux over each inter-rib region. In pursuit enhancement, (termed intersecting ribs), oriented parallel mainstream, added ribs. Friction were determined for two values (10000 20000) Reynolds number. Liquid crystal thermography was employed as diagnostic tool experiments. study supplemented CFD numerical calculations using RNG k-? turbulence model. Local regionally averaged flow tested configurations presented compared. Both experimental results able capture effect produced by vortices their ability locally coefficient promote its more distribution. If standard configuration assumed be reference condition, performance based same pumping power increased case insertion rib, while unable provide enhancements.