Turbulent heat transfer in a trapezoidal channel with transverse and v-shaped ribs on two opposite walls

摘要

This study investigates the turbulent heat transfer and friction in a trapezoidalchannel with opposite walls roughened with transverse and v-shaped ribs. Theroughened channel depicts the internal cooling passage of an aerofoil near the trailingedge. The various configurations investigated for this study are smooth channel, channelwith 90? transverse ribs and channel with v-shaped ribs angled at 45?. The pitch-toheightratio (P/e), rib height-to-hydraulic diameter ratio (e/Dh) and the aspect ratio (W/e)were maintained at 12, 0.1906 and 1, respectively. The configuration was tested forReynolds number ranging from 7,000 to 40,000. The 45? rib was found to produce themaximum heat transfer and minimum pressure loss.