Turbulent heat transfer and hydrodynamics have been studied in concavely and convexly curved dimples with Reynolds numbers ranging from to The large-scale single hemispherical dimple 50 mm in diameter and 25 mm in depth was arranged on the smooth concave or convex wall of a curved rectangular-shaped passage. The fluid flow and heat transfer measurements, and surface streamline observations were performed within the flow curvature parameter ranged from 0.002 to 0.007. The “tornado-like” oscillating vortex bursting periodically out of the dimple was registered in the experiments with a “curved” dimple. This vortex structure is similar to that earlier observed in a “flat” dimple. The surface curvature considerably influences the dimple heat transfer rate in both cases. It enhances heat transfer in a “concave” dimple and reduces it in a “convex” one; however, the more remarkable effect occurred in a concavely curved dimple. The correction factors describing the effect of curvature on average heat transfer in a “curved” dimple have been obtained as a result of experimental study.
Effect of Surface Curvature on Heat Transfer and Hydrodynamics Within a Single Hemispherical Dimple
Contributed by the International Gas Turbine Institute and presented at the 45th International Gas Turbine and Aeroengine Congress and Exhibition, Munich, Germany, May 8–11, 2000. Manuscript received by the International Gas Turbine Institute February 2000. Paper No. 2000-GT-236. Review Chair: D. Ballal.
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Syred , N., Khalatov , A., Kozlov, A., Shchukin , A., and Agachev, R. (February 1, 2000). "Effect of Surface Curvature on Heat Transfer and Hydrodynamics Within a Single Hemispherical Dimple ." ASME. J. Turbomach. July 2001; 123(3): 609–613. https://doi.org/10.1115/1.1348020
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