Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Turbulent Flow and heat Transfer in the Annular Passage with Repeated-Ribbed Roughness on Both Walls

양측벽면에 반복돌출형 거칠기가 있는 이중관통로내의 난류유동과 열전달

  • 안수환 (경상대학교 수산대학 기관공학과) ;
  • 김덕현 (경상대학교 수산대학 기관공학과)
  • Published : 1996.02.01
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Abstract

The fully developed tubulent momentum and heat transfer induced by the square- ribbed roughness elements on both the inner and outer wall surfaces in the concentric annuli are studied analytically based on a modified turbulence model. Heat transfer coefficients for two conditions, i.e, a) inner wall heated as constant heat flux and outer wall insulated b) inner wall insulated and outer wall heated as constant heat flux, are investigated. The analytical results of the fluid flow are verified by experiment. The experiment is done with a pitot tube and a X-type hot wire anemometer to measure the time mean velocity profiles, zero shear stress positions, maximum velocity profiles and friction factors, and etc. The resulting momentum and heat transfer are discussed in terms of various parameters, such as the radius ratio, the relative roughness, the roughness density, Nusselt number and Prandtl number.

Keywords

References

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