The effect of freestream turbulence with different vortical structures on the stagnation region heat transfer was experimentally studied. Reynolds numbers, based on leading edge diameter of the heat transfer model with a cylindrical leading edge, ranged from 67,750 to 142,250. Turbulence generating grids of parallel rods were placed at several positions upstream of the heat transfer model in orientations where the rods were perpendicular and parallel to the stagnation line. The turbulence intensity and ratio of integral length scale to leading edge diameter were in the range 3.93 to 11.78 percent and 0.07 to 0.70, respectively. The grids with rods perpendicular to the stagnation line, where the primary vortical structures are expected to be perpendicular to the stagnation line, result in higher heat transfer than those with rods parallel to the stagnation line. The measured heat transfer data and turbulence characteristics are compared with existing correlation models.
Effect of Turbulence With Different Vortical Structures on Stagnation Region Heat Transfer
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division June 30, 2000; revision received January 20, 2001. Associate Editor: M. Faghri.
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Oo, A. N., and Ching, C. Y. (January 20, 2001). "Effect of Turbulence With Different Vortical Structures on Stagnation Region Heat Transfer ." ASME. J. Heat Transfer. August 2001; 123(4): 665–674. https://doi.org/10.1115/1.1375165
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