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Effect of variable thermal conductivity models on the combined convection heat transfer in a square enclosure filled with a water–alumina nanofluid

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Abstract

In this numerical study, the effects of variable thermal conductivity models on the combined convection heat transfer in a two-dimensional lid-driven square enclosure are investigated. The fluid in the square enclosure is a water-based nanofluid containing alumina nanoparticles. The top and bottom horizontal walls are insulated, while the vertical walls are kept at different constant temperatures. Five different thermal conductivity models are used to evaluate the effects of various parameters, such as the nanofluid bulk temperature, nanoparticle size, nanoparticle volume fraction, Brownian motion, interfacial layer thickness, etc. The governing stream–vorticity equations are solved by using a second-order central finite difference scheme coupled with the conservation of mass and energy. It is found that higher heat transfer is predicted when the effects of the nanoparticle size and bulk temperature of the nanofluid are taken into account.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran

    A. Ghafouri, M. Salari & A. F. Jozaei

Authors
  1. A. Ghafouri
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  2. M. Salari
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  3. A. F. Jozaei
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Correspondence to A. Ghafouri.

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Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 58, No. 1, pp. 117–131, January–February, 2017.

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Ghafouri, A., Salari, M. & Jozaei, A.F. Effect of variable thermal conductivity models on the combined convection heat transfer in a square enclosure filled with a water–alumina nanofluid. J Appl Mech Tech Phy 58, 103–115 (2017). https://doi.org/10.1134/S0021894417010126

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  • DOI: https://doi.org/10.1134/S0021894417010126

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