Abo Bibliothek: Guest
Digitales Portal Digitale Bibliothek eBooks Zeitschriften Referenzen und Berichte Forschungssammlungen
Journal of Enhanced Heat Transfer
Impact-faktor: 0.562 5-jähriger Impact-Faktor: 0.605 SJR: 0.211 SNIP: 0.361 CiteScore™: 0.33

ISSN Druckformat: 1065-5131
ISSN Online: 1026-5511

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

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v3.i1.50
pages 55-71

Steam Condensation on Horizontal Integral-Fin Tubes of Low Thermal Conductivity

M. Hassib Jaber
UOP, Process Equipment, Tonawanda, NY 14151
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


This work identifies preferred integral-fin geometries for steam condensation on low conductivity, integral-fin tubes (admiralty, copper-nickel, and titanium). Although much work has been done to measure and predict condensation coefficients for refrigerants on high thermal conductivity copper tubes, very little has been done for the problem of present interest. Because of the low tube thermal conductivity, and condensate retention, it is necessary to solve a conjugate problem with tube side coolant flow. An adaptation of a model previously published by Adamek and Webb is used for the steam side, and the heat transfer to the coolant, accounting for circumferential wall heat conduction is included in the model. The model was validated by predicting 53 data points for steam, R-11 and R-113. Ninety four percent of the data were predicted within ± 15%. A parametric study was performed to determine the effect of fin height, fin spacing, and fin shape on the condensing coefficient for steam condensing at 35°C on the three tube materials. The results show that the enhancement level decreases as the tube thermal conductivity decreases. The predicted enhancement level for admiralty, copper-nickel, and titanium (or stainless steel) increases as the fin height is reduced from 1.0 mm to 0.5 mm. The preferred fin geometry for titanium, copper-nickel, and admiralty tubes is a 0.5 mm fin height, 0.2 mm tip thickness, and 0.9 mm base thickness. A maximum enhancement level is achieved at 512 fins/m (13 fins/m) for admiralty, copper-nickel, and titanium, for 0.5 mm fin height. The economic optimum fins/in is expected to be less than 512 fins/m. This work has resulted in the identification of preferred fin geometries for low thermal conductivity materials, which are different from those commercially available.

Articles with similar content:

Enhancement of Nucleate Pool Boiling Heat Transfer Using Water on Titanium Oxide and Silicon Oxide Surfaces
International Heat Transfer Conference 15, Vol.38, 2014, issue
Swapan Bhaumik, Sudev Das
Enhancement of Subcooled Flow Boiling Heat Transfer on Cylinders Using Interfere Sleeves
Journal of Enhanced Heat Transfer, Vol.4, 1997, issue 3
Arcot R Balakrishnan, S. Madhusudana Rao
Brazed Aluminum Condensers for Residential Air Conditioning
Journal of Enhanced Heat Transfer, Vol.8, 2001, issue 1
Hyunuk Lee, Ralph L. Webb
Journal of Enhanced Heat Transfer, Vol.18, 2011, issue 4
Liang-Han Chien, Shu-Che Lee
Experimental results for endwall and pin fin heat transfer coefficients
International Heat Transfer Conference 12, Vol.48, 2002, issue
Massimiliano Rizzi, Ivan Catton