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Free convection cooling in modified L-shape enclosures using copper–water nanofluid

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  • Saidi, Majid
  • Karimi, Gholamreza

Abstract

The aim of the present study is investigation of free convection cooling in an L-shape enclosure filled with copper–water nanofluid. The governing equations are solved numerically using finite volume approach. The effects of the volume fraction of the Cu nanoparticles, Rayleigh number and the aspect ratio of the L-shaped enclosure on the heat transfer coefficient, temperature and velocity profiles are studied. The results show that at high Rayleigh numbers, the dominant heat transfer mechanism shifts from conduction to free convection. By increasing Rayleigh number, the numbers of eddies will increase, but the maximum heat transfer coefficient will decrease. For all ranges of Rayleigh number, increasing the volume fraction of the Cu nanoparticles enhances heat transfer coefficient. The simulation results show that inclusion of a number of pins inside the enclosure has a significant effect on increasing the heat transfer coefficient. Also, inclination angle is another important improvement factor for increasing free convection in the enclosures. The numerical results demonstrate that the enclosure with an inclination angle of ω = 225°, has the maximum heat transfer coefficient.

Suggested Citation

  • Saidi, Majid & Karimi, Gholamreza, 2014. "Free convection cooling in modified L-shape enclosures using copper–water nanofluid," Energy, Elsevier, vol. 70(C), pages 251-271.
    • Handle: RePEc:eee:energy:v:70:y:2014:i:c:p:251-271
    DOI: 10.1016/j.energy.2014.03.121
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    References listed on IDEAS

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    Cited by:

    1. Mikhailenko, Stepan A. & Sheremet, Mikhail A. & Pop, Ioan, 2020. "Natural convection combined with surface radiation in a rotating cavity with an element of variable volumetric heat generation," Energy, Elsevier, vol. 210(C).
    2. Garoosi, Faroogh & Hoseininejad, Faraz & Rashidi, Mohammad Mehdi, 2016. "Numerical study of natural convection heat transfer in a heat exchanger filled with nanofluids," Energy, Elsevier, vol. 109(C), pages 664-678.
    3. Rashidi, S. & Bovand, M. & Abolfazli Esfahani, J., 2015. "Structural optimization of nanofluid flow around an equilateral triangular obstacle," Energy, Elsevier, vol. 88(C), pages 385-398.
    4. Bahiraei, Mehdi & Hangi, Morteza, 2014. "Numerical simulation of nanofluid application in a C-shaped chaotic channel: A potential approach for energy efficiency improvement," Energy, Elsevier, vol. 74(C), pages 863-870.

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