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Heat Transfer Research
Импакт фактор: 0.404 5-летний Импакт фактор: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Печать: 1064-2285
ISSN Онлайн: 2162-6561

Выпуски:
Том 51, 2020 Том 50, 2019 Том 49, 2018 Том 48, 2017 Том 47, 2016 Том 46, 2015 Том 45, 2014 Том 44, 2013 Том 43, 2012 Том 42, 2011 Том 41, 2010 Том 40, 2009 Том 39, 2008 Том 38, 2007 Том 37, 2006 Том 36, 2005 Том 35, 2004 Том 34, 2003 Том 33, 2002 Том 32, 2001 Том 31, 2000 Том 30, 1999 Том 29, 1998 Том 28, 1997

Heat Transfer Research

DOI: 10.1615/HeatTransRes.2017019599
pages 103-118

NUMERICAL INVESTIGATION OF HEAT TRANSFER TO SUPERCRITICAL WATER IN A 2 × 2 ROD BUNDLE WITH TWO CHANNELS

Ibrahim Tahir
Department of Nuclear Engineering, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Nilore, Islamabad 45650, Pakistan
Waseem Siddique
Department of Mechanical Engineering, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Nilore, Islamabad 45650, Pakistan
Inamul Haq
Department of Nuclear Engineering, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Nilore, Islamabad 45650, Pakistan
Kamran Qureshi
Department of Mechanical Engineering, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Nilore, Islamabad 45650, Pakistan
Anwar Ul Haq Khan
Department of Polymer and Process Engineering, University of Engineering and Technology, Lahore, Pakistan

Краткое описание

In the present study, a numerical investigation was made using the ANSYS Fluent code to analyze the heat transfer to supercritical water in a 2 × 2 rod bundle. The geometry consists of two channels separated by a solid body. Water moves downward in the first channel and then moves upward in the second channel, which is connected through U-turns. This results in cooling of the rod bundle, which is stationed in the second channel. The outer diameter of the heated rod is 10 mm. Two turbulence models, i.e., k–ε (RNG) and k–ω (SST), were benchmarked against the experimental data. It was found out that the k–ω (SST) model gives the best prediction for heat transfer as well as for the wall temperature distribution in supercritical water with an error maximum of up to 6.8% for the heat transfer coefficient. A parametric study was carried out by the variation in the wall heat flux, mass flux, and operating pressure to study their effects on heat transfer. The results show that the heat transfer phenomenon is similar to that found in a simple tube. A comparison of the heat transfer coefficient with the Dittus–Boelter equation was made and was used for normalizing the predicted heat transfer coefficient. Three heat transfer regimes were observed, namely: normal heat transfer, enhanced heat transfer, and deteriorated heat transfer. The onset of heat transfer deterioration was predicted for a mass flux of 350 kg/m2·s, which shows lower values of the heat transfer coefficient ratio. It was observed that the effect of buoyancy was prominent near the pseudocritical region, after which its effect faded out.


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