Journal
ANNALS OF NUCLEAR ENERGY
Volume 92, Issue -, Pages 175-185Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.anucene.2016.01.019
Keywords
Supercritical CO2; S-CO2 Brayton cycle; Printed circuit heat exchanger; S-CO2 PCHE; CFD; Supercritical fluids
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Funding
- National Research Foundation of Korea [NRF-2013M2A8A1041508]
- Korean Ministry of Science, ICT and Future Planning
- National Research Foundation of Korea [2013M2A8A1041508] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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While most conventional PCHE designs for working fluid of supercritical CO2 require an extension of valid Reynolds number limits of experimentally obtained correlations, Computational Fluid Dynamics (CFD) code ANSYS CFX was used to explore validity of existing correlations beyond their tested Reynolds number ranges. For heat transfer coefficient correlations, an appropriate piece-wising with Ishizuka's and Hesselgreaves's correlation is found to enable an extension of Reynolds numbers. For friction factors, no single existing correlation is found to capture different temperature and angular dependencies for a wide Reynolds number range. Based on the comparison of CFD results with the experimentally obtained correlations, a new CFD-aided correlation covering an extended range of Reynolds number 2000-58,000 for Nusselt number and friction factor is proposed to facilitate PCHE designs for the supercritical CO2 Brayton cycle application. (C) 2016 Elsevier Ltd. All rights reserved.
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