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Journal of Enhanced Heat Transfer
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ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v24.i1-6.250
pages 339-356

REVIEW ON 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

RÉSUMÉ

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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