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Heat transfer enhancement in a tube using circular cross sectional rings separated from wall

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  • Ozceyhan, Veysel
  • Gunes, Sibel
  • Buyukalaca, Orhan
  • Altuntop, Necdet

Abstract

A numerical study was undertaken for investigating the heat transfer enhancement in a tube with the circular cross sectional rings. The rings were inserted near the tube wall. Five different spacings between the rings were considered as p = d/2, p = d, p = 3d/2, p = 2d and p = 3d. Uniform heat flux was applied to the external surface of the tube and air was selected as working fluid. Numerical calculations were performed with FLUENT 6.1.22 code, in the range of Reynolds number 4475-43725. The results obtained from a smooth tube were compared with those from the studies in literature in order to validate the numerical method. Consequently, the variation of Nusselt number, friction factor and overall enhancement ratios for the tube with rings were presented and the best overall enhancement of 18% was achieved for Re = 15,600 for which the spacing between the rings is 3d.

Suggested Citation

  • Ozceyhan, Veysel & Gunes, Sibel & Buyukalaca, Orhan & Altuntop, Necdet, 2008. "Heat transfer enhancement in a tube using circular cross sectional rings separated from wall," Applied Energy, Elsevier, vol. 85(10), pages 988-1001, October.
    • Handle: RePEc:eee:appene:v:85:y:2008:i:10:p:988-1001
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    References listed on IDEAS

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    1. Akansu, Selahaddin Orhan, 2006. "Heat transfers and pressure drops for porous-ring turbulators in a circular pipe," Applied Energy, Elsevier, vol. 83(3), pages 280-298, March.
    2. Yakut, Kenan & Alemdaroglu, Nihal & Sahin, Bayram & Celik, Cafer, 2006. "Optimum design-parameters of a heat exchanger having hexagonal fins," Applied Energy, Elsevier, vol. 83(2), pages 82-98, February.
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    Cited by:

    1. Piotr Bogusław Jasiński, 2021. "Numerical Study of Heat Transfer Intensification in a Circular Tube Using a Thin, Radiation-Absorbing Insert. Part 1: Thermo-Hydraulic Characteristics," Energies, MDPI, vol. 14(15), pages 1-18, July.
    2. Muñoz, Javier & Abánades, Alberto, 2011. "Analysis of internal helically finned tubes for parabolic trough design by CFD tools," Applied Energy, Elsevier, vol. 88(11), pages 4139-4149.
    3. Piotr Bogusław Jasiński, 2021. "Numerical Study of Heat Transfer Intensification in a Circular Tube Using a Thin, Radiation-Absorbing Insert. Part 2: Thermal Performance," Energies, MDPI, vol. 14(15), pages 1-18, July.
    4. Liu, X.P. & Niu, J.L., 2014. "An optimal design analysis method for heat recovery devices in building applications," Applied Energy, Elsevier, vol. 129(C), pages 364-372.
    5. Ma, Ting & Wang, Qiu-wang & Zeng, Min & Chen, Yi-tung & Liu, Yang & Nagarajan, Vijaisri, 2012. "Study on heat transfer and pressure drop performances of ribbed channel in the high temperature heat exchanger," Applied Energy, Elsevier, vol. 99(C), pages 393-401.
    6. Lin, Mei & Wang, Qiu-Wang & Guo, Zhixiong, 2016. "Investigation on evaluation criteria of axial wall heat conduction under two classical thermal boundary conditions," Applied Energy, Elsevier, vol. 162(C), pages 1662-1669.
    7. Kumar, Sharad & Saini, R.P., 2009. "CFD based performance analysis of a solar air heater duct provided with artificial roughness," Renewable Energy, Elsevier, vol. 34(5), pages 1285-1291.

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