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.
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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
July 8–12, 2012
Rio Grande, Puerto Rico, USA
Conference Sponsors:
- Heat Transfer Division
- Fluids Engineering Division
ISBN:
978-0-7918-4479-3
PROCEEDINGS PAPER
Transitional and Turbulent Convective Heat Transfer of Compressible Gas Flows Through Microtubes
Yahui Yang,
Yahui Yang
Università di Bologna, Bologna, Italy
Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
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Chungpyo Hong,
Chungpyo Hong
Tokyo University of Science, Noda, Chiba, Japan
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Gian Luca Morini,
Gian Luca Morini
Università di Bologna, Bologna, Italy
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Yutaka Asako,
Yutaka Asako
Tokyo Metropolitan University, Hachioji, Tokyo, Japan
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Marco Lorenzini,
Marco Lorenzini
Università di Bologna, Bologna, Italy
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Juergen J. Brandner
Juergen J. Brandner
Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
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Yahui Yang
Università di Bologna, Bologna, Italy
Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
Chungpyo Hong
Tokyo University of Science, Noda, Chiba, Japan
Gian Luca Morini
Università di Bologna, Bologna, Italy
Yutaka Asako
Tokyo Metropolitan University, Hachioji, Tokyo, Japan
Marco Lorenzini
Università di Bologna, Bologna, Italy
Juergen J. Brandner
Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
Paper No:
ICNMM2012-73261, pp. 241-250; 10 pages
Published Online:
July 22, 2013
Citation
Yang, Y, Hong, C, Morini, GL, Asako, Y, Lorenzini, M, & Brandner, JJ. "Transitional and Turbulent Convective Heat Transfer of Compressible Gas Flows Through Microtubes." Proceedings of the 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. pp. 241-250. ASME. https://doi.org/10.1115/ICNMM2012-73261
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