Journal
ANNALS OF NUCLEAR ENERGY
Volume 57, Issue -, Pages 209-215Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.anucene.2013.01.060
Keywords
Heat transfer coefficient; In-line tube banks; Crossflow; Longitudinal pitch
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An analytical study using a CFD (Computational Fluid Dynamics) code has been performed to investigate the effect of the longitudinal pitch on the single-phase heat transfer characteristics in crossflow over in-line tube banks. A simplified geometry with periodic and symmetric boundary conditions is employed for the analysis. A sensitivity analysis using various two-equation turbulence models has been conducted to examine the impact of the turbulence model on the heat transfer characteristics and to determine a turbulence model that can describe the physical phenomena of interest appropriately. The result indicates that the heat transfer coefficient might be reduced by 37.1% from the prediction by a well-known correlation by Zukauskas (Adv. Heat Trans., 2007, 8, 93) as the longitudinal pitch decreases. By analyzing the result, it is found that the heat transfer degradation can be estimated by using an empirical correction factor and the Zukauskas' correlation can predict existing experimental data when the correlation is combined with the empirical correction factor developed in this study. (C) 2013 Elsevier Ltd. All rights reserved.
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