Micro-molecular tagging velocimetry of internal gaseous flow

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• 作者：Hiroki Yamaguchi ; Kohei Hayashida ; Yukihiro Ishiguro…
• 关键词：Microgaseous flow ; Flow velocimetry ; Molecular tagging velocimetry ; Photodissociation ; Laser ; induced fluorescence
• 刊名：Microfluidics and Nanofluidics
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：20
• 期：2
• 全文大小：2,200 KB
• 参考文献：Bird GA (1994) Molecular gas dynamics and the direct simulation of gas flows. Clarendon Press, Oxford
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• 作者单位：Hiroki Yamaguchi (1)
  Kohei Hayashida (1)
  Yukihiro Ishiguro (2)
  Kensuke Takamori (2)
  Yu Matsuda (3)
  Tomohide Niimi (1)
  
  1. Department of Micro-Nano Systems Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi, 464-8603, Japan
  2. Department of Mechanical and Aerospace Engineering, Nagoya University, Nagoya, Japan
  3. Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya, Japan
  
• 刊物类别：Engineering
• 刊物主题：Engineering Fluid Dynamics
  Medical Microbiology
  Polymer Sciences
  Nanotechnology
  Mechanics, Fluids and Thermodynamics
  Engineering Thermodynamics and Transport Phenomena
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1613-4990

文摘

Dual-laser micro-molecular tagging velocimetry (μMTV) for internal gaseous flows on the microscale has been successfully demonstrated. MTV is a non-intrusive optical technique suitable for gaseous flow measurement by using molecules as tracers. In our dual-laser μMTV technique, seeded NO₂ molecules in a flow were tagged by photodissociation, producing NO molecules that can be distinguished from surrounding molecules. The tagged NO molecules were traced and visualized by laser-induced fluorescence. However, the fluorescence was in the deep ultraviolet region, and a reflective objective with a finite conjugate optical system was employed for imaging on the microscale. The seeded and tagged molecules of NO₂ and NO are stable in the gas phase at around room temperature and atmospheric pressure. Thus, this technique is free from condensation at the walls and is feasible for measurements of internal gaseous flow on the microscale. To demonstrate the validity of our dual-laser μMTV technique, the cross-sectional flow velocity profile in a rectangular microchannel and flow velocities in a micronozzle were measured and compared with numerical results. Keywords Microgaseous flow Flow velocimetry Molecular tagging velocimetry Photodissociation Laser-induced fluorescence