Inscrição na biblioteca: Guest
Portal Digital Begell Biblioteca digital da Begell eBooks Diários Referências e Anais Coleções de pesquisa
Journal of Enhanced Heat Transfer
Fator do impacto: 0.562 FI de cinco anos: 0.605 SJR: 0.211 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimir: 1065-5131
ISSN On-line: 1026-5511

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

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v7.i6.50
pages 427-438

R-22 Condensation in Flat Aluminum Multi-Channel Tubes

Nae-Hyun Kim
Department of Mechanical Engineering, Incheon National University, 12-1 Songdo-Dong, Yeonsu-Gu Inchon, 22012, Korea
Jin-Pyo Cho
Department of Mechanical Engineering, University of Inchon, Inchon, 402-749, Korea
Jung-Oh Kim
Department of Mechanical Engineering, University of Inchon, Inchon, 402-749, Korea

RESUMO

In this study, condensation heat transfer tests were conducted in flat aluminum multichannel tubes using R-22. Two internal geometries were tested; one with a smooth inner surface and the other with micro-fins. Data are presented for the following range of variables; vapor quality (0.1 ∼ 0.9), mass flux (200 ∼ 600 kg/m2s) and heat flux (5 ∼ 15kW/m2). The micro-fin tube showed higher heat transfer coefficients compared with those of the smooth tube. The difference increased with the vapor quality. Surface tension force acting on the micro-fin surface at high vapor quality is believed to be responsible. For the smooth tube, the heat transfer coefficient increased with the mass flux. The heat transfer coefficient of the micro-fin tube, however, was independent of the mass flux, especially at high vapor qualities. This implies that, at the high vapor quality, the surface tension force on the fin is dominant over vapor shear. The 1997 Yang and Webb model was modified to correlate the present data. The modified model adequately predicted the data.


Articles with similar content:

Condensation Heat Transfer of R-410A and R-22 in U-Tubes
International Heat Transfer Conference 15, Vol.3, 2014, issue
Cheng-Sheng Liu, Liang-Han Chien
MEASUREMENT AND PREDICTION OF VAPOR-SPACE CONDENSATION OF REFRIGERANTS ON TRAPEZOIDAL-FINNED AND TURBO-C GEOMETRIES
Journal of Enhanced Heat Transfer, Vol.20, 2013, issue 1
M. A. Carr, J. Steven Brown, Mark Kedzierski
CONDENSATION HEAT TRANSFER AND PRESSURE DROP OF R-410A IN THREE 7.0MM OUTER DIAMETER MICROFIN TUBES HAVING DIFFERENT INSIDE GEOMETRIES
Journal of Enhanced Heat Transfer, Vol.20, 2013, issue 3
H. W. Byun, J. K. Lee, Nae-Hyun Kim
Convective Vaporization of Pure Refrigerants in Enhanced and Integral-Fin Tube Banks
Journal of Enhanced Heat Transfer, Vol.1, 1994, issue 4
Neelkanth S. Gupte, Ralph L. Webb
EFFECT OF ASPECT RATIO ON EVAPORATION HEAT TRANSFER AND PRESSURE DROP OF R-410A IN FLATTENED MICROFIN TUBES
Journal of Enhanced Heat Transfer, Vol.22, 2015, issue 3
Nae-Hyun Kim