Inscrição na biblioteca: Guest
Portal Digital Begell Biblioteca digital da Begell eBooks Diários Referências e Anais Coleções de pesquisa
Heat Transfer Research
Fator do impacto: 1.199 FI de cinco anos: 1.155 SJR: 0.267 SNIP: 0.503 CiteScore™: 1.4

ISSN Imprimir: 1064-2285
ISSN On-line: 2162-6561

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

Heat Transfer Research

DOI: 10.1615/HeatTransRes.v41.i5.10
pages 493-508

Influence of Torsion on the Laminar Flow and Convective Heat Transfer in Coiled Tubes Arranged in a Rectangular Pattern

I. Conte
Laboratory of Phase Change and Interfacial Transport Phenomena, Department of Thermal Engineering, Tsinghua University, Beijing 100084
Xiao-Feng Peng
Laboratory of Phase Change and Interfacial Transport Phenomena, Department of Thermal Engineering, Tsinghua University, Beijing 100084
Antonio Campo
Department of Mechanical Engineering, The University of Texas at San Antonio, San Antonio, Texas 78249, USA

RESUMO

A detailed numerical investigation has been undertaken to understand the intricacies of laminar forced flows with convective heat transfer inside coiled tubes of circular cross section. The coiled tubes consist of two straight parts and two bends which are arranged in a rectangular pattern. The laminar flows are characterized by three different Reynolds numbers: Re = 300, 700, and 1400. Computer simulations to calculate the laminar velocity and temperature fields were performed for four coiled tubes having different bend torsion ratios. Compared to the coiled tubes near the entrance of the first bend, the rotation experienced by the fluid motion due to torsion is less significant in the second bend. This behavior is attributable to the flow redevelopment in the upstream straight tube. The numerical results demonstrate a vigorous fluid rotation for flows possessing higher velocities whose magnitudes are given by Re = 700 and 1400. The flow path in the bend is representative of a typical flow near the entrance region of a helically coiled tube. The numerical predictions agree well with those results generated by numerical computations and experimental observations. Overall, the heat transfer coefficient decreases with increments in the bend torsion; this behavior is caused primarily by the weakening in the secondary flows.


Articles with similar content:

Experimental and Numerical Investigation of Laminar Flow Over a Forward Facing Step Inside a Pipe
Journal of Enhanced Heat Transfer, Vol.2, 1995, issue 1-2
Jose C. F. Pereira, P. Penalva, M. Stiegelmeier, C. Freek
Heat Transfer in Turbulent Flow Through Tube with Wire-Coil Inserts
Journal of Enhanced Heat Transfer, Vol.12, 2005, issue 4
Sarkar Rashid, M. Zaidul Islam, M. A. Islam
HEAT TRANSFER AND PRESSURE DROP IN HELICALLY COILED TUBES
International Heat Transfer Conference 8, Vol.6, 1986, issue
Volker Gnielinski
ANALYSIS OF THE NON-LINEAR DYNAMICS OF A 3-D TRANSITIONAL LID-DRIVEN CAVITY
TSFP DIGITAL LIBRARY ONLINE, Vol.6, 2009, issue
Xavier Gloerfelt , Jean-Christophe Robinet , Jeremie Chicheportiche, Thomas Coppin
EFFECT OF FLOW REGIME TRANSITION ON FLUID-ELASTIC INSTABILITY OF TUBE BUNDLES IN AN AIR-WATER TWO-PHASE CROSS-FLOW
International Heat Transfer Conference 13, Vol.0, 2006, issue
In-Cheol Chu, Y. J. Yun, Heung June Chung