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Double-diffusive natural convection of Al2O3-water nanofluid in an enclosure with partially active side walls using variable properties

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Abstract

Natural convection heat and mass transfer characteristics in a square enclosure using variable thermal conductivity and variable viscosity are numerically studied. The fluid in the enclosure is a water-based nanofluid containing Al2O3 nanoparticles. The top and bottom horizontal walls are insulated, while a source (Th, Ch) and a sink (Tc, Cc) are located at the vertical left and right walls as active parts, respectively, with Th>Tc and Ch>Cc. The governing equations in the two-dimensional space are discretized using the control volume method. A proper upwinding scheme is employed to obtain stabilized solutions. The study has been carried out for the Rayleigh numbers of 104 to 106, the buoyancy ratios of −5∼5, and different configurations of the source and sink. Results are presented in the form of the streamlines, isotherms and iso-concentraions as well as the average Nusselt and Sherwood numbers. It is observed that average Nusselt number is increased by adding the nanoparticles, while average Sherwood number is reduced. Moreover, both Nusselt and Sherwood number are increased as absolute value of the buoyancy ratio or Rayleigh number is increased.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Kashan, Kashan, Iran

    A. A. Abbasian Arani, E. Kakoli & N. Hajialigol

Authors
  1. A. A. Abbasian Arani
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  2. E. Kakoli
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  3. N. Hajialigol
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Corresponding author

Correspondence to N. Hajialigol.

Additional information

Recommended by Associate Editor Joon Sang Lee

Ali Akbar Abbasian Arani received B.S. and M.S. degrees from Sharif University of Technology, Tehran, Iran, in 1991 and 1994, respectively, and his Ph.D. from the University of Bordeaux 1, France, in 2006. He is currently Associate Professor in the Mechanical Engineering Department at the University of Kashan, Iran. His research interests include fluid mechanics and heat transfer, nanouids and energy conversion.

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Arani, A.A.A., Kakoli, E. & Hajialigol, N. Double-diffusive natural convection of Al2O3-water nanofluid in an enclosure with partially active side walls using variable properties. J Mech Sci Technol 28, 4681–4691 (2014). https://doi.org/10.1007/s12206-014-1035-0

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  • DOI: https://doi.org/10.1007/s12206-014-1035-0

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