Magnetic field effect on natural convection and entropy generation in a half-moon shaped cavity with semi-circular bottom heater having different ferrofluid inside

Mojumder, S; Rabbi, KM; Saha, S; Hasan, MN; Saha, SC

Magnetic field effect on natural convection and entropy generation in a half-moon shaped cavity with semi-circular bottom heater having different ferrofluid inside

Mojumder, S Rabbi, KM Saha, S

Hasan, MN Saha, SC

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Publisher:: ELSEVIER SCIENCE BV
Publication Type:: Journal Article
Citation:: Journal of Magnetism and Magnetic Materials, 2016, 407, pp. 412-424
Issue Date:: 2016-06-01

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Field	Value	Language
dc.contributor.author	Mojumder, S
dc.contributor.author	Rabbi, KM
dc.contributor.author	Saha, S https://orcid.org/0000-0002-9962-8919
dc.contributor.author	Hasan, MN
dc.contributor.author	Saha, SC
dc.date.accessioned	2022-07-15T23:58:02Z
dc.date.available	2022-07-15T23:58:02Z
dc.date.issued	2016-06-01
dc.identifier.citation	Journal of Magnetism and Magnetic Materials, 2016, 407, pp. 412-424
dc.identifier.issn	0304-8853
dc.identifier.issn	1873-4766
dc.identifier.uri	http://hdl.handle.net/10453/158956
dc.description.abstract	In this study magneto-hydrodynamic convection in a half-moon shaped cavity filled with ferrofluid has been analyzed numerically. The cavity has two semi-circular bottom heaters and effect of the distance between these two heaters (λ = 0.1, 0.4) has been thoroughly investigated. Numerical simulation has been carried out for a wide range of Rayleigh number (Ra = 103 ∼ 107), Hartmann number (Ha = 0 ∼ 100) and inclination angle of magnetic field (γ = 0°∼ 90°) to understand the flow field, thermal field and entropy generation respectively. Cobalt-kerosene and Fe3O4 -water ferrofluids are used for the present investigation and considered as a single phase fluid. Galerkin weighted residual method of finite element analysis has been used for numerical solution. The code validation and grid independency test have been carried out to justify the numerical accuracy. It has been observed that increment of magnetic field reduces the heat transfer rate, whereas increment of heater distance augments the heat transfer rate significantly. Results are discussed on the basis of Nusselt number (Nu), Bejan number (Be) and shown by contours and 3D plots. It has also been found that λ = 0.4 always shows better heat transfer rate and entropy optimization.
dc.language	English
dc.publisher	ELSEVIER SCIENCE BV
dc.relation.ispartof	Journal of Magnetism and Magnetic Materials
dc.relation.isbasedon	10.1016/j.jmmm.2016.01.046
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0204 Condensed Matter Physics, 0912 Materials Engineering, 0913 Mechanical Engineering
dc.subject.classification	Applied Physics
dc.title	Magnetic field effect on natural convection and entropy generation in a half-moon shaped cavity with semi-circular bottom heater having different ferrofluid inside
dc.type	Journal Article
utslib.citation.volume	407
utslib.for	0204 Condensed Matter Physics
utslib.for	0912 Materials Engineering
utslib.for	0913 Mechanical Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
utslib.copyright.status	closed_access	*
dc.date.updated	2022-07-15T23:57:53Z
pubs.publication-status	Published
pubs.volume	407

Abstract:

In this study magneto-hydrodynamic convection in a half-moon shaped cavity filled with ferrofluid has been analyzed numerically. The cavity has two semi-circular bottom heaters and effect of the distance between these two heaters (λ = 0.1, 0.4) has been thoroughly investigated. Numerical simulation has been carried out for a wide range of Rayleigh number (Ra = 103 ∼ 107), Hartmann number (Ha = 0 ∼ 100) and inclination angle of magnetic field (γ = 0°∼ 90°) to understand the flow field, thermal field and entropy generation respectively. Cobalt-kerosene and Fe3O4 -water ferrofluids are used for the present investigation and considered as a single phase fluid. Galerkin weighted residual method of finite element analysis has been used for numerical solution. The code validation and grid independency test have been carried out to justify the numerical accuracy. It has been observed that increment of magnetic field reduces the heat transfer rate, whereas increment of heater distance augments the heat transfer rate significantly. Results are discussed on the basis of Nusselt number (Nu), Bejan number (Be) and shown by contours and 3D plots. It has also been found that λ = 0.4 always shows better heat transfer rate and entropy optimization.

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http://hdl.handle.net/10453/158956