四角리브를 갖는 傳熱面에 衝突하는 2次元 噴流의 熱傳達에 관한 硏究 = Heat Transfer of a Two-Dimensional Jet Impinging on the Wall with Transverse Repeated Ribs of Square Cross-Section

다국어 초록 (Multilingual Abstract)

The purpose of this study is augmentation of heat transfer without additional power in the case of rectangular air jet which impinges vertically on the heating surface. The experimental results are obtained heat transfer augmentation of a two-dimensional impinging jet using the surface roughness of transverse repeated-rib type. The integral average heat transfer coefficient of ribbed plate is about two times larger than that of flat plate. In order to supplement the information about the mechanism of heat transfer augmentation, the flow structure in the stagnation region is visually studied by using the smoke wire technique. The heat transfer augmentation is due to the effect of stretching of large scale vortex in the stagnation region.