衝突壁上流に多孔板を設置した軸対称衝突噴流の伝熱増進 : 第1報,多孔板の孔径および孔ピッチの効果

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This report deals with the heat transfer augmentation of an axisymmetric impinging jet using a perforated plate which is installed in front of a target plate. The effects of the diameter (d) and pitch (p) of the holes in the perforated plate, and the spacing between the perforated and target plates on impinging jet heat transfer have been experimentally studied. The obtained results demonstrate that the effects of the present perforated plates on heat transfer augmentation are maximum inside the potential core region. When a perforated plate with a pitch-to-diameter ratio of 2 (p/d=2) is installed at a distance from the impinging plate less than twice the hole diameter (2d), the heat transfer coefficient at the stagnation point on the target plate becomes maximum and goes up to about 2.3 times as large as that in the case without a perforated plate. Under the appropriate conditions of the perforated plate, the mean heat transfer coefficient averaged within some distance from the stagnation point is larger than that without the perforated plate, even when the averaging distance is longer than 1.5 times the nozzle-diameter.
一般社団法人日本機械学会の論文
1988-07-25