Heat transfer characteristics around a low aspect ratio cylindrical protuberance placed in a turbulent boundary layer were investigated. The diameters of the protuberance, D⁠, were 40 and 80mm⁠, and the height to diameter aspect ratio H∕D ranged from 0.125 to 1.0. The Reynolds numbers based on D ranged from 1.1×104 to 1.1×105 and the thickness of the turbulent boundary layer at the protuberance location, δ⁠, ranged from 26 to 120mm for these experiments. In this paper we detail the effects of the boundary layer thickness and the protuberance aspect ratio on heat transfer. The results revealed that the overall heat transfer for the cylindrical protuberance reaches a maximum value when H∕δ=0.24⁠.

Issue Section:
Forced Convection
Keywords:
heat transfer, external flows, boundary layer turbulence
Topics:
Boundary layer turbulence, Heat transfer, Flow (Dynamics), Boundary layers, Reynolds number
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