流れと直角な円柱まわりの熱伝達に及ぼす円柱取付け壁面速度境界層の影響

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  • The Effects of a Wall Boundary Layer on Local Heat Transfer from a Circular Cylinder in Cross Flow.
  • ナガレ ト チョッカク ナ エンチュウ マワリ ノ ネツ デンタツ ニ オヨボ

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Heat transfer from a circular cylinder in cross flow, in particular, from its rear region is enhanced in neighborhood of a wind tunnel wall on which the turbulent boundary layer is developed. At two stations where the boundary layer thicknesses are 0.75 and 2.4 times as much as the cylinder, the local heat transfers are measured toward the spanwise and circumferential directions by means of a small size heat flux probe devised by the authors utilizing a thermister. The maximum enhancements of heat transfers averaged around the cylinder is 1. 6∼1. 8 times as much as the uniform cross flow heat transfer. The heat transfer in the boundary layer is more enhanced at the rear stagnation point than that at the front stagnation point. The enhancement in the bigger thickness of the boundary layer is greater and appears nearer the wall than that in the smaller thickness, which is due to the strong vortex generated on the wall just behind the cylinder.

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