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3D investigation of natural convection of nanofluids in a curved boundary enclosure applying lattice Boltzmann method

Hosseini Abadshapoori, M ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1108/HFF-10-2017-0414
  3. Publisher: Emerald Group Publishing Ltd , 2018
  4. Abstract:
  5. Purpose: The purpose of this paper is to investigate the natural convection behavior of nanofluids in an enclosure. The enclosure is a 3D capsule with curved boundaries filled with TiO2-water nanofluid. Design/methodology/approach: In this paper, a multiple relaxation times lattice Boltzmann method (MRT-LBM) has been used. Two-component LBM has been conducted to consider the interaction forces between nanoparticles and the base fluid. Findings: Results show that the enhanced Nusselt number (Nu*) increases with the increase in volume fraction of nanoparticles (ϕ) and Ra number and decrease of nanoparticle size (λ). Additionally, the findings indicate that increasing volume fraction beyond a certain value decreases Nu*. Originality/value: This paper presents a MRT model of lattice Boltzmann in a 3D curved enclosure. A correlation is also presented based on the current results for Nu* depending on Ra number, volume fraction and size of nanoparticles. Furthermore, a comparison for the convergence rate and accuracy of this model and the SIMPLE algorithm is presented. © 2018, Emerald Publishing Limited
  6. Keywords:
  7. 3D simulation ; Curved boundary ; Lattice Boltzmann method ; Multiple relaxation ; Nanofluid ; Natural convection ; Rayleigh number ; Computational fluid dynamics ; Enclosures ; Kinetic theory ; Nanoparticles ; Natural convection ; Titanium dioxide ; Volume fraction ; 3D simulations ; Curved boundary ; Lattice Boltzmann method ; Multiple relaxation ; Nanofluids ; Rayleigh number ; Nanofluidics
  8. Source: International Journal of Numerical Methods for Heat and Fluid Flow ; Volume 28, Issue 8 , 2018 , Pages 1827-1844 ; 09615539 (ISSN)
  9. URL: https://www.emeraldinsight.com/doi/abs/10.1108/HFF-10-2017-0414