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Mach Number on Outlet Plane of a Straight Micro-Tube

[+] Author Affiliations
Y. Asako, D. Kawashima

Tokyo Metropolitan University, Tokyo, Japan

T. Yamada

Lund University, Lund, Sweden

C. Hong

Kagoshima University, Kagoshima, Japan

Paper No. IMECE2013-64188, pp. V07AT08A020; 7 pages
doi:10.1115/IMECE2013-64188
From:
  • ASME 2013 International Mechanical Engineering Congress and Exposition
  • Volume 7A: Fluids Engineering Systems and Technologies
  • San Diego, California, USA, November 15–21, 2013
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5631-4
  • Copyright © 2013 by ASME

abstract

The Mach number and pressure on the outlet plane of a straight micro-tube were investigated numerically for both laminar and turbulent flow cases. The numerical methodology is based on the Arbitrary-Lagrangian-Eulerian (ALE) method. The LB1 turbulence model was used for the turbulent flow case. The compressible momentum and energy equations with the assumption of the ideal gas were solved. The computational domain is extended to the downstream region from the micro-tube outlet. The back pressure was given to the outside of the downstream region. The computations were performed for a tube whose diameter ranges from 50 to 500 μm. The average Mach number on the outlet plane of the fully under-expanded flow depends on the tube diameter and ranges from 1.16 to 1.25. The flow characteristics of the under-expanded gas flow in a straight micro-tube were revealed.

Copyright © 2013 by ASME
Topics: Mach number

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