HEAT TRANSFER CONTROL IN THERMO-MAGNETIC CONVECTION OF PARAMAGNETIC FLUIDS IN LAMINAR, TRANSIENT AND TURBULENT REGIMES

2017 ◽  
Author(s):  
Sasa Kenjeres ◽  
R. Zinsmeester ◽  
L. Pyrda ◽  
Elzbieta Fornalik-Wajs ◽  
Janusz S. Szmyd
Keyword(s):  
Heat Transfer ◽  
Magnetic Convection

A numerical study on heat transfer of a ferrofluid flow in a square cavity under simultaneous gravitational and magnetic convection

2020 ◽  
Vol 34 (1-2) ◽  
pp. 119-132 ◽  
Author(s):  
Lucas H. P. Cunha ◽  
Ivan R. Siqueira ◽  
Arthur A. R. Campos ◽  
Adriano P. Rosa ◽  
Taygoara F. Oliveira
Keyword(s):  
Heat Transfer ◽  
Numerical Study ◽  
Square Cavity ◽  
Magnetic Convection

Gravitational and Magnetic Convection in Magnetic Colloids

2005 ◽  
Author(s):  
Gennady F. Putin ◽  
Alexandra A. Bozhko
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Liquid Crystal ◽  
Magnetic Particles ◽  
Homogeneous Magnetic Field ◽  
Temperature Sensors ◽  
Localized States ◽  
Long Wave ◽  
Magnetic Colloids ◽  
Magnetic Convection

Experiments were performed to examine the influence of homogeneous magnetic field on convection instability and flows in a layer of magnetic fluid heated from one wide side and cooled from another. The temperature sensors were used for measurement of heat transport across the layer. Visualization of flow patterns was provided by a liquid crystal sheet. The results indicate that with the help of a magnetic field it is possible to control the convection stability, intensity of the heat transfer and the form of convection motions. The interaction of gravitational and magnetic convection mechanisms for different orientations of the layer and magnetic field were studied. The essential influence of gravitational sedimentation of magnetic particles and their aggregates on convection in magnetic colloids is shown. A number of non-linear regimes of convection, including localized states and repeated long-wave transients from convection to conduction were observed.

scholarly journals Symmetry and Asymmetry in the Thermo-Magnetic Convection of Silver Nanofluid

Symmetry ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 1891
Author(s):  
Elzbieta Fornalik-Wajs ◽  
Aleksandra Roszko ◽  
Janusz Donizak
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Flow Structure ◽  
Magnetic Induction ◽  
Heat Transfer Performance ◽  
Transfer Performance ◽  
Two Phase ◽  
Cubical Enclosure ◽  
Magnetic Convection ◽  
Rayleigh Benard

Application of nanofluids is aimed at enhancing the heat transfer performance the same as the utilization of a strong magnetic field. The potential of the combined effect of these passive and active methods was analyzed numerically. The silver nanofluid thermo-magnetic convection in a cubical enclosure placed in the Rayleigh–Benard configuration was investigated for various concentrations of nanoparticles and various values of magnetic induction at constant temperature difference. The nanofluid flow was considered as a two-phase flow and studied with the Euler–Euler approach. The main outcome was related to the heat transfer performance, but also a lot of attention was paid to the flow structure, which is very difficult to obtain by experimental methods. The results exhibited a flow structure with diagonal axis of symmetry in all analyzed cases and stabilizing effect of magnetic field. The heat transfer performance is indicated by the Nusselt number, which increases with an increasing value of magnetic induction but decreases with an increasing concentration of nanoparticles.

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