Abonnement à la biblothèque: Guest
Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections
Journal of Enhanced Heat Transfer
Facteur d'impact: 0.562 Facteur d'impact sur 5 ans: 0.605 SJR: 0.211 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimer: 1065-5131
ISSN En ligne: 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.v3.i2.30
pages 95-108

Critical Heat Flux and Pressure Drop of Subcooled Flow Boiling in Small-Diameter Tubes with Twisted-Tape Inserts

W. Tong
Department of Mechanical Engineering, Aeronautical Engineering & Mechanics, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
Arthur E. Bergles
Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York; University of Maryland, College Park, Maryland; Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
Michael K. Jensen
Center for Multiphase Flow, Rensselaer Polytechnic Institute, Troy, NY, USA; University of Wisconsin-Milwaukee, Mechanical Engineering Department Milwaukee, Wisconsin 53201

RÉSUMÉ

Critical heat flux (CHF) and pressure drop of small diameter tubes with twisted-tape inserts in subcooled flow boiling have been investigated experimentally. The influences of twisted-tape and test-section geometries (twist ratio, tube diameter and length) and fluid thermal-hydraulic conditions (mass flux, exit pressure, and inlet temperature) on both CHF and pressure drop have been analyzed and presented. Experiments were performed using stainless steel tubes with diameters ranging from 2.44 to 6.54 mm and aluminum twisted tapes (δ = 0.42 mm) with twist ratios from 1.9 to . The gap between the twisted-tape edge and the tube wall was between 0.05−0.1 mm. The experimental results show significant enhancement of stable CHF by using twisted tapes with small twist ratios. Under high-mass-flux conditions, swirl-flow CHF is shown to be inversely proportional to twjst ratio, tube diameter, inlet temperature, and length-to-diameter ratio, but directly proportional to mass flux and exit pressure. Based upon the experimental data, an empirical subcooled swirl-flow CHF correlation, covering all six parameters, is proposed for a wide range of parametric values.
Pressure drop is strongly coupled to the conditions of CHF. The studies have revealed that the heat transfer enhancement achieved by means of twisted-tape inserts is generally accompanied by an increase in pressure drop. In this study, the influences of the above six parameters and heat flux on pressure drop have been addressed. The principal parameters affecting both single- and two-phase pressure drop are twist ratio, tube diameter, length-to-diameter ratio, and mass flux.


Articles with similar content:

CRITICAL REVIEW ON HEAT FLUX AND PRESSURE DROP OF SUBCOOLED FLOW BOILING IN SMALL-DIAMETER TUBES WITH TWISTED-TAPE INSERTS
Journal of Enhanced Heat Transfer, Vol.24, 2017, issue 1-6
Arthur E. Bergles, Michael K. Jensen, W. Tong
Condensation Heat Transfer and Pressure Drop of R22 in 5-mm Diameter Microfin Tubes
Journal of Enhanced Heat Transfer, Vol.11, 2004, issue 4
Weicheng Wang, Xiaoliang Wang, Xiaomin Wu
The Effect of the Diameter in Convective Boiling of Refrigerant R-134a
International Heat Transfer Conference 13, Vol.0, 2006, issue
J. M. Saiz Jabardo, Paulo Eduardo Lopes Barbieri
Experimental and theoretical study on the stratified flow regime of oil-water mixtures
International Heat Transfer Conference 12, Vol.29, 2002, issue
Giorgio Sotgia, Paolo Tartarini, Marino di Marzo
FLOW PATTERN AND VOID FRACTION IN AN ADVANCED TWO-PHASE FLOW THERMOSYPHON LOOP
International Heat Transfer Conference 13, Vol.0, 2006, issue
Rahmatollah Khodabandeh, D. Haglind, Björn Palm