Water based nanofluid free convection heat transfer in a three dimensional porous cavity with hot sphere obstacle in existence of Lorenz forces

•Water based magneto nanofluid a porous cubic enclosure is considered.•Al2O3-water nanofluid has been utilized considering Brownian motion effect on its thermal conductivity.•The problem of hot sphere obstacle is simulated via LBM.•Results indicate that Lorentz forces makes conduction mode stronger...

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Bibliographic Details
Published in:International journal of heat and mass transfer 2018-10, Vol.125, p.375-386
Main Authors: Sheikholeslami, M., Shehzad, S.A., Li, Zhixiong
Format: Article
Language:English
Subjects:
Aluminum oxide
Brownian motion
Cubic lattice
Darcy number
Fluid dynamics
Fluid flow
Fluid mechanics
Free convection
Hartmann number
Heat conductivity
Heat transfer
Heat treatment
Lattice Boltzmann method
Magnetohydrodynamics
MHD
Nanofluid
Nanofluids
Porous materials
Porous medium
Temperature gradients
Thermal boundary layer
Thermal conductivity
Three dimensional
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Summary:•Water based magneto nanofluid a porous cubic enclosure is considered.•Al2O3-water nanofluid has been utilized considering Brownian motion effect on its thermal conductivity.•The problem of hot sphere obstacle is simulated via LBM.•Results indicate that Lorentz forces makes conduction mode stronger than convection. H2O based nanofluid magnetohydrodynamic free convection in a porous cubic cavity with hot sphere obstacle is investigated by means of Lattice Boltzmann method. Influences of Darcy number (Da), Hartmann number (Ha), and Rayleigh number (Ra) on Al2O3-H2O nanofluid treatment is demonstrated. Thermal conductivity is considered as function of Brownian motion. Results indicate that Lorentz forces makes temperature gradient to decrease. Thermal boundary layer becomes thicker with augment of Hartmann number but opposite treatment is observed for Darcy number.
ISSN:0017-9310
1879-2189
DOI:10.1016/j.ijheatmasstransfer.2018.04.076