Journal ArticleDOI
Natural convection and entropy generation of nanofluid filled cavity having different shaped obstacles under the influence of magnetic field and internal heat generation
TLDR
In this paper, the authors investigated the effect of different shaped obstacles (circular, square and diamond) installed under the influence of a uniform magnetic field and uniform heat generation was numerically investigated.Abstract:
In this study, natural convection in a nano-fluid filled cavity having different shaped obstacles (circular, square and diamond) installed under the influence of a uniform magnetic field and uniform heat generation was numerically investigated. The cavity was heated from below and cooled from the vertical sides while the top wall was assumed to be adiabatic. The temperatures of the side walls vary linearly. The governing equations were solved by using Galerkin weighted residual finite element formulation. The numerical investigation was performed for a range of parameters: external Rayleigh number (104 ≤ RaE ≤ 106), internal Rayleigh number (104 ≤ RaI ≤ 106), Hartmann number (0 ≤ Ha ≤ 50), and solid volume fraction of the nanofluid (0 ≤ ϕ ≤ 0.05). It is observed that the presence of the obstacles deteriorates the heat transfer process and this is more pronounced with higher values of Re E . Averaged heat transfer reduces by 21.35%, 32.85% and 34.64% for the cavity with circular, diamond and squared shaped obstacles compared to cavity without obstacles at RaI = 106. The effect of heat transfer reduction with square and diamond shaped obstacles compared to case without obstacle is less effective with increasing values of Hartmann number. Second law analysis was also performed by using different measures for the normalized total entropy generation.read more
Citations
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Simulation of nanofluid heat transfer in presence of magnetic field: A review
TL;DR: In this article, a review of previous publications about nanofluid hydrothermal treatment in the presence of magnetic field is presented, where Ferrohydrodynamic and Magnetohydrodynamic (MHD) can take role in simulations.
Journal ArticleDOI
Nanofluid convective heat transfer using semi analytical and numerical approaches: A review
TL;DR: In this paper, the authors provide a brief review of researches on nanofluid flow and heat transfer via semi-analytical and numerical methods and show that the Nusselt number is an increasing function of nanoparticle volume fraction.
Journal ArticleDOI
MHD natural convection in an inclined wavy cavity with corner heater filled with a nanofluid
TL;DR: In this paper, a mathematical model of MHD free convection in an inclined wavy enclosure filled with a Cu-water nanofluid in the presence of an isothermal corner heater has been carried out.
Journal ArticleDOI
MHD mixed convection and entropy generation of nanofluid filled lid driven cavity under the influence of inclined magnetic fields imposed to its upper and lower diagonal triangular domains
TL;DR: In this paper, a mixed convection of CuO-water nanofluid filled lid driven cavity having its upper and lower triangular domains under the influence of inclined magnetic fields is numerically investigated.
Journal ArticleDOI
Simulation of heat transfer and entropy generation of MHD natural convection of non-Newtonian nanofluid in an enclosure
TL;DR: In this paper, the authors have analyzed the effect of additive nanoparticles on heat transfer and entropy generation on laminar natural convection of non-Newtonian nanofluids in the presence of an external horizontal magnetic field in a square cavity.
References
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Numerical study of natural convection in partially heated rectangular enclosures filled with nanofluids
Hakan F. Öztop,Eiyad Abu-Nada +1 more
TL;DR: In this paper, the authors used the finite volume technique to solve the governing equations of heat transfer and fluid flow due to buoyancy forces in a partially heated enclosure using nanofluids.
Journal ArticleDOI
Natural convection in enclosures
TL;DR: In this paper, the complex nature of the natural convection phenomena in enclosures is discussed and the boundary value problem is formulated, assuming that the motion is 2D and steady, the fluid is incompressible and frictional heating is negligible, and the difference between the hot wall and cold wall temperatures is small relative to the absolute temperatures of the cold wall.
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Second law analysis in heat transfer
TL;DR: In this article, the second law of thermodynamics is used as a basis for evaluating the irreversibility associated with simple heat transfer processes, such as heat augmentation techniques, heat exchanger design, and thermal insulation systems.