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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Journal of Enhanced Heat Transfer
Импакт фактор: 0.562 5-летний Импакт фактор: 0.605 SJR: 0.211 SNIP: 0.361 CiteScore™: 0.33

ISSN Печать: 1065-5131
ISSN Онлайн: 1026-5511

Выпуски:
Том 26, 2019 Том 25, 2018 Том 24, 2017 Том 23, 2016 Том 22, 2015 Том 21, 2014 Том 20, 2013 Том 19, 2012 Том 18, 2011 Том 17, 2010 Том 16, 2009 Том 15, 2008 Том 14, 2007 Том 13, 2006 Том 12, 2005 Том 11, 2004 Том 10, 2003 Том 9, 2002 Том 8, 2001 Том 7, 2000 Том 6, 1999 Том 5, 1998 Том 4, 1997 Том 3, 1996 Том 2, 1995 Том 1, 1994

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v1.i4.60
pages 351-364

Convective Vaporization of Pure Refrigerants in Enhanced and Integral-Fin Tube Banks

Neelkanth S. Gupte
Senior Engineer, Carrier Corporation Syracuse, NY
Ralph L. Webb
Department of Mechanical Engineering The Pennsylvania State University, University Park, PA 16802, USA
Specialist in enhanced heat transfer and heat exchanger design

Краткое описание

Convective vaporization data were obtained on staggered tube banks of enhanced nucleate boiling tubes and integral-fin tubes (IFT) with an equilateral pitch-to-diameter ratio of 1.25. Pure refrigerants R-11, R-123, and R-134a were used as working fluids. The data were taken at 4 and 27 C in an apparatus that allows an independent control of vapor quality, mass velocity, and heat flux. The data span vapor qualities of 0 to 0.9, mass velocities of 10 to 28 kg/m2·s, and heat flux of 15 to 48 kW/m2. The data were predicted using a modified superposition model (using 5=1) and also correlated by an asymptotic model. The nucleate boiling components were obtained from pool boiling data, and single-phase heat transfer coefficients were calculated using appropriate correlations for tube banks. The modified superposition model predicted approximately 80% of the GEWA-SE and Turbo-B data within + 20% but did a poor job predicting the integral-fin tube bank data with R-11 at 4 C. Tube banks made of enhanced nucleate boiling tubes, where boiling performance is governed mainly by subsurface cavities, show insignificant effect of forced convection when compared to plain or integral-fin tube banks.


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