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

The Korean Society of Mechanical Engineers (대한기계학회)
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Direct Numerical Simulation of Strongly-Heated Internal Gas Flows with Large Variations of Fluid Properties

유체의 물성치변화를 고려한 수직원형관내 고온기체유동에 관한 직접수치모사

  • 배중헌 (서울대학교 대학원 기계항공공학부) ;
  • 유정열 (서울대학교 기계항공공학부) ;
  • 최해천 (서울대학교 기계항공공학부 및 난류제어연구단) ;
  • 유종우 (포항산업과학연구원)
  • Published : 2004.11.01
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Abstract

Direct numerical simulation (DNS) of strongly-heated air flows moving upward in a vertical tube has been conducted to investigate the effect of gas property variations on turbulence modification. Three heating conditions(q$_1$$^{+}$=0.0045, 0.0035 and 0.0018) are selected to reflect the experiment of Shehata and McEligot (1998) at the inlet bulk Reynolds numbers of 4300 and 6000. At these conditions, the flow inside the heated tube remains turbululent or undergoes a transition to subturbulent or laminarizing flow. Consequently, a significant impairment of heat transfer occurs due to the reduction of flow turbulence. The predictions of integral parameters and mean profiles such as velocity and temperature distributions are in excellent agreement with the experiment. The computed turbulence data indicate that a reduction of flow turbulence occurs mainly due to strong flow acceleration effects for strongly-heated internal gas flows. Thus, buoyancy influences are secondary but not negligible especially for turbulent flow at low heating condition. Digital flow visualization also shows that vortical structures rapidly decay as the heating increases.s.

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References

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