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Research Papers: Forced Convection

Experimental Study on Single-Phase Gas Flow in Microtubes

[+] Author and Article Information
T. T. Zhang

School of Mechanical and Electronic Control Engineering, Beijing Jiaotong University, Beijing 100044, China; Department of Mechanical and Aerospace Engineering, Rutgers University, Piscataway, NJ 08854;  Planning and Strategic Development Department, China Three Gorges Corporation, Yichang 443002, China

L. Jia, C. W. Li, L. X. Yang

 School of Mechanical and Electronic Control Engineering, Beijing Jiaotong University, Beijing 100044, China

Y. Jaluria1

 Department of Mechanical and Aerospace Engineering, Rutgers University, Piscataway, NJ 08854,jaluria@jove.rutgers.edu

1

Corresponding author.

J. Heat Transfer 133(11), 111703 (Sep 20, 2011) (6 pages) doi:10.1115/1.4004391 History: Received September 09, 2010; Revised June 01, 2011; Accepted June 02, 2011; Published September 20, 2011; Online September 20, 2011

An experimental system for single-phase gas flow in microtubes has been developed. The effects of viscous heating and compressibility on the flow and temperature field were studied for a wide range of governing parameters. Also, an analytical/numerical model of the flow was developed. Numerical results for the flow and heat transfer in the slip flow region were found to agree quite well with the experimental data, lending support to the model. The study provides greater physical insight into and understanding the effects of viscous dissipation and compressibility in microtube flow and the associated heat transfer. In addition, the combined experimental and numerical simulation approaches of the process can be used for control and optimization of systems based on microtube heat transfer.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

A sketch of experimental system

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Figure 2

Photograph of the experimental system

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Figure 3

SEM picture of a typical microtube considered

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Figure 4

Variation of fRe with the Mach number Ma

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Figure 5

Domain employed for the numerical calculations

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Figure 6

Temperature distribution over a cross-section at the outlet of a microtube for Dh  = 0.553 mm, L = 0.8 m, and Re = 45.6

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Figure 7

Temperature distribution along the microtube axis for Dh  = 0.553 mm and L = 0.8 m (a) Re = 45.6 (b) Re = 91.2 (the X-direction is scaled to 0.01 for easy visualization)

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Figure 8

Comparison of numerical results on the temperature difference between the inlet and the outlet versus Re number with experimental data for Dh  = 0.553 mm and L = 0.8 m

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Figure 9

Variation of the maximum temperature difference between the inlet and the outlet with the length of tube, for Dh  = 0.553 mm

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Figure 10

Variation of the Mach number when the maximum temperature difference between the inlet and the outlet appears with the length of tube, for Dh  = 0.553 mm

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Figure 11

Variation of the temperature difference between the inlet and the outlet with Re

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