Full Content is available to subscribers

Subscribe/Learn More  >

Transitional and Turbulent Convective Heat Transfer of Compressible Gas Flows Through Microtubes

[+] Author Affiliations
Yahui Yang

Università di Bologna, Bologna, ItalyKarlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany

Chungpyo Hong

Tokyo University of Science, Noda, Chiba, Japan

Gian Luca Morini, Marco Lorenzini

Università di Bologna, Bologna, Italy

Yutaka Asako

Tokyo Metropolitan University, Hachioji, Tokyo, Japan

Juergen J. Brandner

Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany

Paper No. ICNMM2012-73261, pp. 241-250; 10 pages
  • ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 Fluids Engineering Division Summer Meeting
  • ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels
  • Rio Grande, Puerto Rico, USA, July 8–12, 2012
  • Conference Sponsors: Heat Transfer Division, Fluids Engineering Division
  • ISBN: 978-0-7918-4479-3
  • Copyright © 2012 by ASME


This paper presents the results of experimental and numerical investigation of forced convection of gas flows through stainless steel microtubes having inner diameters of 750 μm, 510 μm and 170 μm. The study covers both transitional and turbulent flow regimes (3000<Re<12000). In these regimes the flow is highly compressible, inducing conversion from thermal energy to kinetic energy inside microtubes. Moreover, reverse energy conversion takes place immediately after the fluid is vented to the outlet chamber where the measurement of fluid outlet temperature is performed. In this work the effects of fluid compressibility on the forced convection at microscale is quantitatively discussed by combining experimental data with numerical predictions. It is evidenced that compressibility effects can distinctively enhance convective heat transfer in terms of Nusselt number. This enhancement turns out to be more pronounced for microtubes with smaller inner diameter even at medium Reynolds numbers. In order to explore in-depth the heat transfer mechanism, the system is numerically simulated adopting the Arbitrary-Lagrangian-Eulerian (ALE) method and the Lam-Bremhorst Low-Reynolds number turbulence model to evaluate eddy viscosity coefficient and turbulence energy. The crossing of the numerical data, which provide the local value of pressure and temperature, with the experimental ones helps to explain the physical sense of the experimental results. In addition, the convective heat transfer coefficients obtained in the present work are compared with both classical correlations validated for conventional pipes and the correlations proposed for gas flows through microtubes.

Copyright © 2012 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In