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단일 제트에 노출된 원형 실린더 표면의 열전달 특성에 대한 연구
이재형(J.H.Lee),송성진(S.J.Song),김동범(T.Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
This study presents thermo-fluidic characteristics on a circular cylinder subject to the impingement of a single jet. For a fixed circular jet diameter (D<SUB>j</SUB>), the diameter of a target cylinder (D) varies, D/D<SUB>j</SUB> = 2.5, 5.0, and 10.0, at a fixed jet Reynolds number, Re<SUB>j</SUB> = 20,000. Heat transfer distribution on the surface of the cylinder reveals that secondary heat transfer peak exists, which contributes significantly to overall heat transfer. Results demonstrate that laminar to turbulent transition is responsible for the secondary peak. However, it occurs only if the target cylinder is positioned inside the potential core of the jet. The effect of relative curvature D/D<SUB>j</SUB> on heat transfer is also investigated.