한 면에 리브가 설치된 확대 정사각 채널에서 리브 각이 열전달에 미치는 효과
Effects of Rib Angles on Heat Transfer in a Divergent Square Channel With Ribs on One Wall
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초록
축방향 거리에 따라 확대되는 정사각 채널에서 발달된 난류유동의 국부 난류 열전달과 압력강하를 실험적으로 조사하였다. 정사각 확대채널에 한 면에만 높이가 10 mm인 리브를 설치하였다. 리브의 충돌 각은 30o, 45o, 60o 그리고 90o 로 한 벽면에 만 설치하였다. 레이놀즈수가 22,000~ 79,000의 범위에서 실험을 수행하였다. 연구 결과 45o의 리브 충돌각이 가장 우수한 열전달 성능을 보였다.
Abstract
In this study, the experiments are performed to investigate the local heat transfer and pressure drops of developed turbulent flows in the diverging square channels along the axial distance. The square divergent channels are manufactured with a fixed rib height (e) = 10 mm. Four different parallel angled ribs (a = 30°, 45°, 60°, and 90°) are placed on the channel’s one-sided wall only. TThe measurement are conducted within the range of Reynolds numbers from 22,000 to 79,000. The results show that a rib angle-of-attack of 45° produces the best heat-transfer performance.
참고문헌 (8)
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