This experimental study concerns the characteristics of vortex flow in a concentric annulus with a diameter ratio of 0.52, whose outer cylinder is stationary and inner one is rotating. Pressure losses and skin friction coefficients have been measured for fully developed laminar flows of water and of 0.4% aqueous solution of sodium carboxymethyl cellulose, respectively, when the inner cylinder rotates at the speed of . The results of the present study show the effect of the bulk flow Reynolds number Re and Rossby number Ro on the skin friction coefficients. They also point to the existence of a flow instability mechanism. The effect of rotation on the skin friction coefficient depends significantly on the flow regime. In all flow regimes, the skin friction coefficient is increased by the inner cylinder rotation. The change in skin friction coefficient, which corresponds to a variation of the rotational speed, is large for the laminar flow regime, whereas it becomes smaller as Re increases for transitional flow regime and, then, it gradually approaches to zero for turbulent flow regime. Consequently, the critical bulk flow Reynolds number decreases as the rotational speed increases. The rotation of the inner cylinder promotes the onset of transition due to the excitation of Taylor vortices.
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e-mail: nswoo@skku.edu
e-mail: kyjp7272@kigam.re.kr
e-mail: ykhwang@skku.edu
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January 2006
Special Section On The Fluid Mechanics And Rheology Of Nonlinear Materials At The Macro, Micro And Nano Scale
Experimental Study on the Helical Flow in a Concentric Annulus With Rotating Inner Cylinder
Nam-Sub Woo,
Nam-Sub Woo
School of Mechanical Engineering,
e-mail: nswoo@skku.edu
Sungkyunkwan University
, 300 Chunchun-dong, Jangan-gu, Suwon 440-746, South Korea
Search for other works by this author on:
Young-Ju Kim,
Young-Ju Kim
School of Mechanical Engineering,
e-mail: kyjp7272@kigam.re.kr
Sungkyunkwan University
, 300 Chunchun-dong, Jangan-gu, Suwon 440-746, South Korea
Search for other works by this author on:
Young-Kyu Hwang
Young-Kyu Hwang
School of Mechanical Engineering,
e-mail: ykhwang@skku.edu
Sungkyunkwan University
, 300 Chunchun-dong, Jangan-gu, Suwon 440-746, South Korea
Search for other works by this author on:
Nam-Sub Woo
School of Mechanical Engineering,
Sungkyunkwan University
, 300 Chunchun-dong, Jangan-gu, Suwon 440-746, South Koreae-mail: nswoo@skku.edu
Young-Ju Kim
School of Mechanical Engineering,
Sungkyunkwan University
, 300 Chunchun-dong, Jangan-gu, Suwon 440-746, South Koreae-mail: kyjp7272@kigam.re.kr
Young-Kyu Hwang
School of Mechanical Engineering,
Sungkyunkwan University
, 300 Chunchun-dong, Jangan-gu, Suwon 440-746, South Koreae-mail: ykhwang@skku.edu
J. Fluids Eng. Jan 2006, 128(1): 113-117 (5 pages)
Published Online: September 22, 2005
Article history
Received:
July 20, 2004
Revised:
September 22, 2005
Citation
Woo, N., Kim, Y., and Hwang, Y. (September 22, 2005). "Experimental Study on the Helical Flow in a Concentric Annulus With Rotating Inner Cylinder." ASME. J. Fluids Eng. January 2006; 128(1): 113–117. https://doi.org/10.1115/1.2136923
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