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The influence of a magnetic field on the heat transfer of a magnetic nanofluid in a sinusoidal channel

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Abstract.

In this study, two dimensional numerical simulations are performed to investigate the influence of the magnetic field on the nanofluid flow inside a sinusoidal channel. This work reveals the influence of variable magnetic field in the heat transfer of heat exchanger while the mixture is in a single phase. In this heat exchanger, the inner tube is sinusoidal and the outer tube is considered smooth. The magnetic field is applied orthogonal to the axis of the sinusoidal tube. In our study, the ferrofluid (water with 4 vol% nanoparticles (Fe3O4)) flows in a channel with sinusoidal bottom. The finite volume method with the SIMPLEC algorithm is used for handling the pressure-velocity coupling. The numerical results present validated data with experimentally measured data and show good agreement with measurement. The influence of different parameters, like the intensity of magnetic field and Reynolds number, on the heat transfer is investigated. According to the obtained results, the sinusoidal formation of the internal tube significantly increases the Nusselt number inside the channel. Our findings show that the magnetic field increases the probability of eddy formation inside the cavities and consequently enhances the heat transfer (more than 200%) in the vicinity of the magnetic field at low Reynolds number (Re=50). In addition, the variation of the skin friction shows that the magnetic field increases the skin friction (more than 600%) inside the sinusoidal channel.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Iran

    S. Valiallah Mousavi, M. Barzegar Gerdroodbary, Mohsen Sheikholeslami & D. D. Ganji

Authors
  1. S. Valiallah Mousavi
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  2. M. Barzegar Gerdroodbary
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  3. Mohsen Sheikholeslami
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  4. D. D. Ganji
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Correspondence to Mohsen Sheikholeslami.

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Valiallah Mousavi, S., Barzegar Gerdroodbary, M., Sheikholeslami, M. et al. The influence of a magnetic field on the heat transfer of a magnetic nanofluid in a sinusoidal channel. Eur. Phys. J. Plus 131, 347 (2016). https://doi.org/10.1140/epjp/i2016-16347-4

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  • DOI: https://doi.org/10.1140/epjp/i2016-16347-4

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