Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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A Study on the Transient Convective Heat Transfer for Supercritical Water in a Vertical Tube

수직관 내 초임계상태 물의 천이상태 대류열전달현상에 관한 연구

  • Lee Sang-Ho (Division of Mechanical and Automotive Engineering, Wonkwang University)
  • 이상호 (원광대학교 기계자동차공학부)
  • Published : 2005.12.01
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Abstract

Numerical analysis has been carried out to investigate transient turbulent convective heat transfer in a vertical tube for supercritical water near the thermodynamic critical point. Heat transfer and fluid flow in the tube we strongly coupled due to the large variations of thermodynamic and transport properties such as density, specific heat, and turbulent viscosity. As pressure in the tube approaches to the critical pressure, the properties variation with time becomes larger. Heat transfer coefficient rapidly decreases along the tube near the pseudocritical temperature at the tube wall for $P_R<1.2$. Stanton number variation with time is largely reduced in the region of gas-like phase in comparison with Nusselt number. Turbulent viscosity ratio close to the wall increases near the pseudocritical temperature and it gradually decreases with time.

Keywords

References

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