Effect of Heat Transfer Augmentation by Square Rod Array in Impinging Air Jet System(Heat Transfer Characteristic of Potential Core Region)

충돌공기분류계에서 사각 ROD에 의한 전열증진 효과(포텐셜코어영역에서의 전열특성)

This research has been proceeded over the potential core region(H/B=2) of two-dimensional impinging air jet sytem, in which square rods(width of 6 mm) has been set up in front of heating surface in order to increase heat transfer. The objective of this research was to investigate the characteristics of heat transfer and air flow, in eases of the clearance from rods to heating surface(C=1, 2, 4, 6 mm) and the pitch between each rods(P=30, 40, 50 mm) changed. And this research compared the above with the experimentation without rods. As result, heat transfer performance was best under the condition of C=1mm, in case clearance changed, and there was no serious difference in the effect of heat transfer augmentation in the case of pitch of rods changed.

본 연구는 2차원 충돌분류계의 포텐셜코어영역(H/B=2)내에서 전열증진을 목적으로 전열면 앞에 폭 6mm인 정 4각 rod군을 설치하고 rod와 전열면간의 간극(C=1, 2, 4, 6mm)과 rod와 rod사이의 피치(P=30, 40, 50mm)를 변화시킬때의 유동특성과 전열특성을 실험적으로 규명하고 rod를 설치하지 않았을 경우와 비교 검토한 것으로 간극변화시에는 C=1mm인 경우가 전열성능이 가장 우수하였으며, rod의 피치(P)를 변화시킨 경우에는 rod가 없는 평판에 비해 각각 약 1.6배의 평균전열증진율이 나타났다.