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TURBULENT FLOW AND HEAT TRANSFER CHARACTERISTICS IN U-TUBES: A NUMERICAL STUDY

ABSTRACT
Using the standard k-e model, 3-dimensional turbulent flow and heat transfer characteristics in U-tubes are investigated. Uncertainty is approximated using experimental correlations and grid independence study. Increasing the Dean number is shown to intensify a secondary flow within the curved section. The overall Nusselt number for the tube is found to decrease substantially relative to straight tubes, while the overall skin friction coefficient remains practically unaffected. Local skin friction coefficient, Nusselt number, and wall temperature along the tube wall are presented.
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PAPER SUBMITTED: 2008-05-25
PAPER REVISED: 2008-10-01
PAPER ACCEPTED: 2008-11-11
DOI REFERENCE: https://doi.org/10.2298/TSCI0904175A
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2009, VOLUME 13, ISSUE 4, PAGES [175 - 181]
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© 2019 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence