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Heat transfer enhancement in a transitional channel flow
AbstractFlow modification by an array of spanwise eddy-promoters oriented normal to the flow direction is sometimes used to enhance the convective heat transfer rate from a heated wall. Here, we study the effect of such eddy-promoters on the heat transfer and dissipation in a fully-developed channel flow with one heated wall, in the laminar and transitional flow regimes. The experiment shows that flows with eddy-promoters result in a significant decrease in dissipation for a given heat transfer rate at all supercritical Reynolds numbers investigated. When the results are compared to other eddy-promoter geometries, they support a scale-matched destabilization method. The primary enhancement mechanism in the subcritical flows is travelling waves, but for supercritical flows vortex shedding is an equally important mechanism.
Heat transfer enhancement in a transitional channel flow
AbstractFlow modification by an array of spanwise eddy-promoters oriented normal to the flow direction is sometimes used to enhance the convective heat transfer rate from a heated wall. Here, we study the effect of such eddy-promoters on the heat transfer and dissipation in a fully-developed channel flow with one heated wall, in the laminar and transitional flow regimes. The experiment shows that flows with eddy-promoters result in a significant decrease in dissipation for a given heat transfer rate at all supercritical Reynolds numbers investigated. When the results are compared to other eddy-promoter geometries, they support a scale-matched destabilization method. The primary enhancement mechanism in the subcritical flows is travelling waves, but for supercritical flows vortex shedding is an equally important mechanism.
Heat transfer enhancement in a transitional channel flow
Zagarola, Mark V. (author) / Smits, Alexander J. (author) / Karniadakis, George E. (author)
Journal of Wind Engineering and Industrial Aerodynamics ; 49 ; 257-267
1993-01-01
11 pages
Article (Journal)
Electronic Resource
English
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