Heat Transfer and Pressure Drop Measurement for Square Channels with V-shape Ribs at High Reynolds Numbers

Abstract

In previous studies, the thermal performance of ribbed channels was studied for Reynolds numbers up to 100,000 with different rib shapes. In more recent studies, the thermal performance of ribbed channels was studied up to Reynolds numbers of 400,000 for angled ribs to cover the range of internal cooling inside land-based gas turbines. Previous studies also show that the thermal performance of V-shaped ribs is better than the angled ribs. In this study, the Reynolds number from 30,000 to 400,000 is studied with V-shaped ribs. The blockage ratio e/D is 0.1, 0.15, and 0.18 and spacing ratio P/e is 5, 7.5, and 10. The results show that the Nusselt number enhancement decreases when the Reynolds number increases. The friction factor is found to be independent of The Reynolds number. The thermal performance decreases when the Reynolds number increases. Correlations for the Nusselt number and the friction factor as function of Re, e/D, and P/e are developed.