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

The Korean Society of Mechanical Engineers (대한기계학회)
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Numerical Study on the Thermal Entrance Effect in Miniature Thermal Conductivity Detectors

소형 Thermal Conductivity Detector의 입구열전달 거동에 대한 수치해석

  • Kim, U-Seung (Department of Mechanical Engineering, College of Engineering, Hanyang University) ;
  • Kim, Yeong-Min (Dept. of Mechanical Engineering, Graduate School of Hanyang University) ;
  • Chen, Kuan (Department of Mech. Eng., University of Utah) ;
  • Cheon, Won-Gi (Cheju National University)
  • 김우승 (한양대학교 공학대학 기계공학과) ;
  • 김영민 (한양대학교 대학원 기계공학과) ;
  • ;
  • 천원기 (제주대학교 에너지공학과)
  • Published : 2002.03.01
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Abstract

The microchannel flow in miniature TCDs (thermal conductivity detectors) is investigated numerically. The solutions based on the boundary layer approximation are not very accurate in the region of the duct inlet for low Reynolds numbers. In this study, two-dimensional Navier-Stokes equations are considered to analyze the gas flow in a miniature TCD. Effects of channel size, inlet and boundary conditions on the heat transfer rate are examined. When the gas stream is not preheated, the distances for a miniature TCD to reach the conduction-dominant region for duct flow are found to be approximately two and three times the thermal entry length for duct flow with constant properties, respectively, leer constant wall temperature and constant wall heat flux boundary conditions. If the gas temperature at the channel inlet is close to the mean gas temperature in the conduction-dominant region, the entrance region is much shorter compared to other cases considered in this study.

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References

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