Mass/heat transfer in a ribbed passage with cylindrical vortex generators: The effect of generator-rib spacing

Document Type

Article

Publication Date

11-1-2000

Abstract

Ribbed heat-exchange passage are encountered in processes such as heat exchangers, turbine blade-cooling, etc. The effect of vortex generators on the heat transfer from internally ribbed passages was studied using a mass transfer technique. Cylindrical vortex generators placed directly above the ribs were used. At small generator/rib spacings (s/e = 0.55), the two acted as a single element, and lead to a retardation of the shear layer development past the reattachment point. At a larger generator/rib spacing (s/e = 1.5), the generator wake and the rib shear layer interacted with each other to promote mixing and heat transfer. The heat/mass transfer from the ribbed surfaces depended on the Re and s/e values. Better overall enhancement was observed at lower Reynolds numbers. At Re = 5000, enhancement was generally obtained.

Publication Source (Journal or Book title)

Journal of Heat Transfer

First Page

641

Last Page

652

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