正方配列マルチ衝突噴流の熱伝達特性に及ぼす吹出形状の影響

概要

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The effect of jet injection shape on the enhancement of heat transfer has been investigated. Experiments on 3×3 square arrays of circular, cross-shaped and oblique cross-shaped jets were conducted at jet diameter Reynolds number of 4,680. Injection distance is from 2 to 6 jet diameters, and jet-to-jet spacing is 6 jet diameters. Steady state thermochromic liquid crystal technique has been employed to measure local Nusselt number. Flow visualization and micro flow sensor were used to clarify the characteristics of flow structure. Some changes due to the flow intermittency and the local turbulence intensity induced by the effect of jet shape were observed among adjacent impinging jets. These phenomena contribute to the enhancement of the heat transfer at the intermediate area enclosed by surrounding impinging jets.
2013-03-19