International Journal of Air-Conditioning and Refrigeration

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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A Study on the Helical Flow of Newtonian and Non-Newtonian Fluid

  • Woo, Nam-Sub (Department at Mechanical Eng., Sungkyunkwan University) ;
  • Hwang, Young-Kyu (Department at Mechanical Eng., Sungkyunkwan University) ;
  • Kim, Young-Ju (Fluid Eng. & Deep-Sea Mining, Korea Institute of Geoscience & Mineral Resources)
  • Published : 2007.03.30
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Abstract

This study concerns the characteristics of helical flow in a concentric and eccentric annulus with a diameter ratio of 0.52 and 0.9, whose outer cylinders are stationary and inner ones are rotating. Pressure losses and skin friction coefficients have been measured for fully developed flows of water and 0.2% aqueous of sodium carboxymethyl cellulose (CMC), respectively, when the inner cylinder rotates at the speed of 0-500 rpm. The effect of rotation on the skin friction is significantly dependent on the flow regime. In all flow regimes, the skin friction coefficient is increased by the inner cylinder rotation. The change of skin friction coefficient corresponding to the variation of rotating speed is large for the laminar flow regime, whereas it becomes smaller as Re increases for the transitional flow regime and, then, it gradually approach to zero for the turbulent flow regime.

Keywords

References

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