A Numerical Study of the Thermal Entrance Effect in Miniature Thermal Conductivity Detectors
- Title
- A Numerical Study of the Thermal Entrance Effect in Miniature Thermal Conductivity Detectors
- Author
- 김우승
- Issue Date
- 2005-12
- Publisher
- HEMISPHERE PUBL CORP
- Citation
- HEAT TRANSFER ENGINEERING, v. 26, No. 4, Page. 65-72
- Abstract
- The microchannel flow in miniature TCDs (thermal conductivity detectors) is investigated numerically. Solutions based on the boundary-layer approximation are not very accurate near the channel inlet for low Reynolds numbers. As a result the full Navier-Stokes equations were solved to analyze the gas flow in a miniature TCD. The effects of channel size and inlet and boundary conditions on the heat transfer rate were examined. When the gas stream is not preheated, the distance for a miniature TCD to reach the conduction-dominant region is approximately two to three times the thermal entry length of a constant property pipe flow subject to a uniform thermal boundary condition. If the gas inlet temperature is in the vicinity of the mean gas temperature in the conduction-dominant region, the entrance length is much shorter and very close to that of a constant property pipe flow with uniform surface temperature or heat flux.
- URI
- https://www.tandfonline.com/doi/full/10.1080/01457630590916293https://repository.hanyang.ac.kr/handle/20.500.11754/111984
- ISSN
- 0145-7632; 1521-0537
- DOI
- 10.1080/01457630590916293
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MECHANICAL ENGINEERING(기계공학과) > Articles
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