ボルテックスジェネレータのある円柱まわりの流動と熱伝達

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  • Fluid flow and heat transfer around a circular cylinder with vortex generators.
  • ボルテックスジェネレータ ノ アル エンチュウ マワリ ノ リュウドウ ト ネ

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Experimental studies on fhe fluid flow and heat transfer around a circular cylinder with vortex generators were carried out in the range of subcritical Reynolds numbers. According to the height of vortex generators and the Reynolds numbers, four flow patterns were found in connection with the transition in the boundary layer and flow separation. The local and average heat transfer on the rear surface vary with the values of the drag coefficient, the rms fluctuating pressure and the reciprocal of Strouhal number. The heat transfer coefficients at the rear stagnation point for four patterns are related to the Strouhal number by N <ur> /R <2/3> e= 0.018/S <1.4 >, within an error of 10%, and also to the rms fluctuating pressure at the rear stagnation point, ΔPr, hr ∝ ΔP <0.31>r.

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