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Heat Transfer Research
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ISSN Imprimir: 1064-2285
ISSN En Línea: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2018018737
pages 1513-1530


Alireza Shahriari
Department of Mechanical Engineering, University of Zabol, Zabol, Iran; Department of Mechanical Engineering, Birjand University, Birjand, Iran
Ebrahim Jahanshahi Javaran
Department of Energy, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran
Mohammad Rahnama
Department of Mechanical Engineering, Shahid Bahonar University of Kerman, Kerman, Iran


In this paper, two-dimensional natural convection of an Al2O3/water nanofluid is presented using the lattice Boltz-mann method. Natural convection occurs in a cavity with two complex-wavy vertical walls, as hot and cold surfaces while the top and bottom ones are insulated. The effect of pertinent parameters such as the volume fraction of nanoparticles, Rayleigh numbers, and complex-wavy-wall geometry parameters on flow and heat transfer fields are investigated in detail. Results show an increase in the Nusselt number with volume fraction for Rayleigh numbers in the range 103 < Re < 106. Moreover, the effect of wavy-surface geometry parameters such as the wavelength and amplitude ratio, on heat transfer is studied, and an optimum value for heat transfer rate is obtained.


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