NDLI: Phenomena peculiar to underexpanded flows in supersonic micronozzles

Content Provider	Springer Nature Link
Author	Handa, Taro Matsuda, Yu Egami, Yasuhiro
Copyright Year	2016
Abstract	In the present study, the characteristics of supersonic flows in micronozzles are experimentally and computationally investigated for Reynolds numbers ranging from 618 to 5560. In the experiments, the flows are created in a rectangular contoured nozzle whose heights at its throat and exit are 286 and 500 μm, respectively. The number-density distribution along the nozzle centerline is measured using the laser-induced fluorescence technique under an underexpanded condition for each Reynolds number. The experimental results reveal that the underexpanded flow expands along the streamwise direction in a range where the cross-sectional area of the nozzle is constant although the flow in such a range has been believed to be compressed owing to friction. The results also reveal that the unexpected range where the flow expands extends with a decrease in Reynolds number. In the computations, the Navier–Stokes equations are solved numerically. The computational results agree very well with the experimental results; i.e., the computational code used in the present study is validated by the experiments. By using the computational results, the reason for the appearance of the phenomena peculiar to supersonic micronozzle flows is discussed. As a result, it is found that information about the back pressure under which the flow is underexpanded can reach into the inside of a micronozzle. Such a property induces the unexpected phenomena observed in the experiments.
Starting Page	1
Ending Page	15
Page Count	15
File Format	PDF
ISSN	16134982
Journal	Microfluidics and Nanofluidics
Volume Number	20
Issue Number	12
e-ISSN	16134990
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-11-29
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Micro gas flow Supersonic micronozzle flow Compressible flow Underexpanded flow Laser-induced fluorescence Boundary layer blockage Engineering Fluid Dynamics Biomedical Engineering Analytical Chemistry Nanotechnology and Microengineering
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Materials Chemistry Condensed Matter Physics Electronic, Optical and Magnetic Materials

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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