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내·외벽에 거칠기가 있는 이중동심관 유동에 대한 실험적 연구
안수환,정양범,김경천,Ahn, S.W.,Jung, Y.B.,Kim, K.C. 대한설비공학회 1995 설비공학 논문집 Vol.7 No.1
Fully developed turbulent flow through three concentric annuli with both the rough inner and outer walls was experimentally investigated for a Reynolds number range Re=15,000-85,000. Measurements were made of the pressure drop, the positions of zero shear stress and maximum velocity, and the velocity distributions in annuli of radius ratios, ${\alpha}=0.26$, 0.4 and 0.56, respectively. The experimental results showed that the positions of zero shear streess and maximum velocity were only weakly dependent on the Reynolds number. It was also found that the position of zero shear stress was not coincident with that of maximum velocity. Furthmore, the former was influenced more sensitively than the latter on the square-ribbed roughness along the axial direction.