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Research Papers: Forced Convection

Prediction of Turbulent Convective Heat Transfer to Supercritical CH4 /N2 in a Vertical Circular Tube

[+] Author and Article Information
Zhongxuan Du

Wensheng Lin1

Anzhong Gu

Institute of Refrigeration and Cryogenics,  Shanghai Jiao Tong University, Shanghai 200240, China

1

Corresponding author.

J. Heat Transfer 133(11), 111701 (Sep 16, 2011) (6 pages) doi:10.1115/1.4004433 History: Received November 12, 2010; Revised June 14, 2011; Published September 16, 2011; Online September 16, 2011

Cooling of supercritical CH4 /N2 mixture is the most important heat transfer process during coalbed methane (CBM) liquefaction. In this paper, numerical studies of the turbulent convective heat transfer of supercritical CH4 /N2 flowing inside a vertical circular tube have been conducted with Lam–Bremhorst low Reynolds turbulence model. The present numerical investigations focus on the effects of the nitrogen content, heat flux, and flow orientation. Results indicate that as nitrogen content increases, the maximum heat transfer coefficient gradually decreases and corresponds to lower temperature. Heat transfer coefficient is slightly affected by heat flux in the liquid-like region and increases with increasing heat flux in the gas-like region. Buoyancy effect gradually increases with decreasing bulk temperature, and reaches its maximum at the pseudo-critical point, and then drops as bulk temperature further decreases. It is significant in the liquid-like region and negligible in the gas-like region. At the same time, buoyancy effect enhances heat transfer in the upward flow and impairs it in the downward flow.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 2

Comparisons of the numerical calculations with the Bruch correlation

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Figure 3

Effect of nitrogen content on heat transfer coefficient. (a) Upward flow and (b) downward flow.

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Figure 4

Specific heat with different nitrogen contents at 5.5 MPa

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Figure 5

Effects of heat flux on heat transfer coefficient. (a) Upward flow and (b) downward flow.

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Figure 6

Thermophysical and transport properties variations of methane at 5.5 MPa

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Figure 7

Gr/Re2.7 versus bulk temperature

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Figure 8

Effects of buoyancy on flow direction

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Figure 9

Velocity profile at various axial locations along the tube length

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