In the present investigation, turbulent heat transfer in fully developed curved-pipe flow has been studied by using large eddy simulation (LES). We consider a fully developed turbulent curved-pipe flow with axially uniform wall heat flux. The friction Reynolds number under consideration is = 1000 based on the mean friction velocity and the pipe radius, and the Prandtl number (Pr) is 0.71. To investigate the effects of wall curvature on turbulent flow and heat transfer, we varied the nondimensionalized curvature (δ) from 0.01 to 0.1. Dynamic subgrid-scale models for turbulent subgrid-scale stresses and heat fluxes were employed to close the governing equations. To elucidate the secondary flow structures due to the pipe curvature and their effect on the heat transfer, the mean quantities and various turbulence statistics of the flow and temperature fields are presented, and compared with those of the straight-pipe flow. The friction factor and the mean Nusselt number computed in the present study are in good agreement with the experimental results currently available in the literature. We also present turbulence intensities, skewness and flatness factors of temperature fluctuations, and cross-correlations of velocity and temperature fluctuations. In addition, we report the results of an octant analysis to clarify the correlation between near-wall turbulence structures and temperature fluctuation in the vicinity of the pipe wall. Based on our results, we attempt to clarify the effects of the pipe curvature on turbulent heat transfer. Our LES provides researchers and engineers with useful data to understand the heat-transfer mechanisms in turbulent curved-pipe flow, which has numerous applications in engineering.
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Large Eddy Simulation of Turbulent Heat Transfer in Curved-Pipe Flow
Kyung-Soo Yang
Kyung-Soo Yang
Professor
Department of Mechanical Engineering,
Inha University,
Incheon 402-751, Korea
e-mail: ksyang@inha.ac.kr
Department of Mechanical Engineering,
Inha University,
Incheon 402-751, Korea
e-mail: ksyang@inha.ac.kr
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Changwoo Kang
Kyung-Soo Yang
Professor
Department of Mechanical Engineering,
Inha University,
Incheon 402-751, Korea
e-mail: ksyang@inha.ac.kr
Department of Mechanical Engineering,
Inha University,
Incheon 402-751, Korea
e-mail: ksyang@inha.ac.kr
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received September 19, 2014; final manuscript received April 29, 2015; published online August 11, 2015. Assoc. Editor: Danesh / D. K. Tafti.
J. Heat Transfer. Jan 2016, 138(1): 011704 (11 pages)
Published Online: August 11, 2015
Article history
Received:
September 19, 2014
Revision Received:
April 29, 2015
Citation
Kang, C., and Yang, K. (August 11, 2015). "Large Eddy Simulation of Turbulent Heat Transfer in Curved-Pipe Flow." ASME. J. Heat Transfer. January 2016; 138(1): 011704. https://doi.org/10.1115/1.4030968
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