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Journal of Enhanced Heat Transfer
インパクトファクター: 0.562 5年インパクトファクター: 0.605 SJR: 0.211 SNIP: 0.361 CiteScore™: 0.33

ISSN 印刷: 1065-5131
ISSN オンライン: 1026-5511

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v4.i1.40
pages 35-51

Numerical 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

要約

A numerical investigation of laminar mixed convection developing flow and heat transfer with variable viscosity in internally finned tubes with helical fins and constant wall temperature boundary condition was performed. The numerical model was validated by comparison with experimental data and was able to predict experimentally measured friction factors and Nusselt numbers with an accuracy of ± 10% for a wide range of fin geometries and operating conditions. A parametric study was conducted for fin geometry ranges of 8 ≤ N ≤ 54,0.03 ≤ H ≤ 0.1, and 0 ≤ γ ≤ 45 degrees, where N is the number of fins, H is the non-dimensional fin height, and γ is the fin helix angle. The ranges of operating condition were 102 ≤ Rein ≤ 103, 50 ≤ Prin ≤ 1,000, 0 ≤ Rain ≤ 106, and − 30 ≤ Δ T ≤ 30 K, where ΔT is the wall-to-inlet temperature difference. The model provided local information that supplemented length-averaged experimental results, particularly revealing that coring (higher velocities in the core of the tube and retarded velocities in the inter-fin region) is responsible for poor heat transfer performance of the tubes with large number of fins. The magnitude of this coring was exaggerated as the number of fins was increased but was about the same for both heating and cooling situations. The length-averaged results indicated that large heat transfer enhancement can be obtained for short non-dimensional lengths.


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