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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

HEAT TRANSFER ENHANCEMENT USING GROOVES

DOI: 10.1615/TFESC1.hte.012981
pages 1387-1390

Sumanta Acharya
Ring Companies Chair Mechanical Engineering Department University of Memphis, Memphis TN 38152

Krishnendu Saha
General Electric, Bengaluru, Karnataka, India


KEY WORDS: Gas turbine, internal cooling, turbulence promoters, ribs, grooves

Abstract

Heat transfer enhancement using ribs or fins are commonly employed practices in a number of applications including turbine cooling, heat exchangers etc. The ribs or fins enhance surface area for heat transfer and increase flow unsteadiness and turbulence that enhance heat transfer coefficient. In the present paper, grooves are used as turbulence enhancement devices, and an experimental study is conducted that investigates different angled grooves and combination of grooves-ribs as turbulence promoters to enhance heat transfer from the wall. The grooves are angled at 45° to the mainstream flow direction and 7 total combinations are studied. The geometries studied are 1) V groove with the V facing upstream flow, 2) V groove with the V facing downstream flow, 3) angled groove with smaller pitch, 4) angled groove with larger pitch, 5) combination of angled groove with 45° angled rib, 6) combination of angled groove with transverse rib and finally 7) combination of V groove and V rib facing upstream flow. Experiments are conducted for a Reynolds number range of 13000-55000. Detailed and averaged heat transfer coefficient values are obtained for all the geometries. Pressure drop and friction factor are calculated from the inlet to the exit of the grooved channel. Overall performance is calculated from the averaged heat transfer data and friction factor. Performance of different geometries are compared and it is found that the combination of V groove and V rib performed the best..

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