Characteristics of Flow and Heat Transfer on the Circular Impinging Jet Adding Annular Suction Flow

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  • C244 環状吸込流を付加した円形衝突噴流の流動および伝熱特性
  • カンジョウ スイコミリュウ オ フカシタ エンケイ ショウトツ フンリュウ ノ

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Abstract

A doublet flow is a circular jet added an annular suction flow on the same axis by using a double coaxial pipe. As concerns a doublet flow, it has been clarified that as the suction velocity increases, the fluctuating velocity increases over the flow field. From the above mentioned characteristic, the doublet flow is applied on the cooling of the wall and investigated the characteristics of the flow and the heat transfer by using PIV and thermocouple respectively. As a result, it is found that the flow characteristic is independent of both the existence and the position of the wall. In the case of the velocity ratio of the suction velocity to the injection velocity equal to 0.92, the vicinity of the pipe exit has the higher fluctuating velocity than the free jet with the wall removed. Therefore, by setting up the wall on the position, the high fluctuating velocity is obtained in the vicinity of the wall. Furthermore, in the above mentioned condition, the high Nusselt number is obtained. From these analyses, it is found that the heat transfer characteristics are closely related with the flow characteristics.

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