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Journal of Enhanced Heat Transfer
Fator do impacto: 0.562 FI de cinco anos: 0.605 SJR: 0.175 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.v4.i1.50
pages 53-70

Experimental Investigation of Laminar Flow and Heat Transfer in Internally Finned Tubes

Biswadip Shome
Global Technology and Engineering Center, Offices No. 501 & No. 502, D Block, Weikfield IT Citi Info Park, Pune-Nagar Road, Pune, India 411014
Michael K. Jensen
Center for Multiphase Flow, Rensselaer Polytechnic Institute, Troy, NY, USA; University of Wisconsin-Milwaukee, Mechanical Engineering Department Milwaukee, Wisconsin 53201

RESUMO

An experimental investigation of laminar flow and heat transfer in internally finned tubes was performed. Length-averaged measurements of heat transfer and pressure drop for thermally developing flow were conducted for both heating and cooling situations as well as for low and high heat flux cases using ethylene glycol as the test fluid. The heat transfer tests were performed with fluid-to-fluid heating or cooling which closely approximates constant wall temperature boundary conditions. Isothermal friction factors, diabatic friction factors, and Nusselt numbers were measured for fin geometry ranges of 8 ≤ N ≤ 54, 0.015 ≤ H ≤ 0.17, and 0 ≤ γ ≤ 45 degrees and operating condition ranges of 150 < Re < 2,000, 50 < Pr < 185, 0.3 < μbw < 3.6, and 3 × 105 < Ra < 8 × 104. The length-to-inside tube diameter ratios for the tubes tested were around 120. The maximum heat transfer enhancement relative to a smooth tube was obtained for tubes with fewer number of tall fins with strong free convection effects and was around 75% at the expense of 50% increase in pressure drop penalty over the smooth tube value. Overall, the micro-finned tubes and the tubes with fewer number of tall fins were found to be ineffective in laminar flow with small to moderate free convection effects as little or no heat transfer enhancement was obtained at the expense of a fairly large pressure drop penalty. The results also indicated that the fin geometry has little effect on the heat transfer, particularly for micro-finned tubes. The effect of free convection on the pressure drop was marginal but its influence on the heat transfer was found to be substantial.


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