Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Numerical Study of Turbulent Flow Around a Rotating Cylinder with Surface Roughness

표면에 계단이 부착된 회전하는 실린더 주위 난류유동의 전산해석

  • 양경수 (인하대학교 기계.항공.자동화 공학부) ;
  • 황종연 (인하대학교 대학원) ;
  • 김영완 (인하대학교 대학원)
  • Published : 2000.08.01
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Abstract

Erosion-corrosion in a pipe system often occurs at fittings, valves, and weld beads where flow separation and reattachment yield high turbulence intensity. Thus identifying their correlations would be the first step towards resolving the erosion-corrosion problems associated with industrial applications. Bremhorst of the Univ. of Queensland, Australia, proposed that a rotating cylinder with surface roughness (two backward-facing steps periodically mounted on a circular cylinder) be an economical and tractable tool which can generate extreme flow conditions for erosion-corrosion study. In this work, DNS has been carried out for turbulent flows around the same rotating cylinder as his experimental apparatus. Our result shows that a region of intense turbulence intensity and high wall-shear stress fluctuation is formed along the cylinder surface in the recirculating region behind the step, where high mass-transfer capacity is also experimentally observed. Since corrosion is mass-transfer controlled, our finding sheds light on the direction of future corrosion research.

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References

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