LOCAL HEAT-TRANSFER IN A ROTATING SERPENTINE PASSAGE WITH RIB-ROUGHENED SURFACES

An experimental study is conducted on heat transfer in a rotating serp entine passage with rib-roughened walls under uniform wan heat flux. S even roughness configurations are tested to determine their effects on convective heat transfer enhancement. Results are obtained for heat t ransfer distributions which are compared with those having smooth surf aces. It is revealed that rotation, roughness and the angle-of-attack of ribs have significant influences on the heat transfer performance w ith 45PR having the best enhancement in both stationary and rotating c ases. The flow mechanism in a rib-roughened passage is proposed to exp lain its effect on heat transfer performance.