Abstract
Magnetic fluid flow and heat transfer by natural and thermomagnetic convection was studied numerically in a square enclosure. The aim was to investigate the transition from natural convection to thermomagnetic convection by exploring situations where buoyancy and the Kelvin body force would be opposing each other such that the magnetic effects would in some cases be the dominant factor throughout the domain and in other cases only in a part of the fluid. The numerical model coupled the solution of the magnetostatic field equation with the heat and fluid flow equations to simulate the fluid flow under a realistic magnetic field generated by a permanent magnet. The results suggest that the domain of influence over the flow field is largely aligned with the domain of dominance of the respective driving force. The result is that the transition from a single buoyancydriven convection cell to a single thermomagnetically driven cell is via a twocell structure and that the local effect on the flow field leads to a global effect on the heat transfer with a minimum of the Nusselt number in the transition region.
Original language  English 

Pages (fromto)  116123 
Number of pages  8 
Journal  Journal of Magnetism and Magnetic Materials 
Volume  447 
Early online date  12 Sept 2017 
DOIs  
Publication status  Published  1 Feb 2018 
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WolfGerrit Fruh
 School of Engineering & Physical Sciences  Associate Professor
 School of Engineering & Physical Sciences, Institute of Mechanical, Process & Energy Engineering  Associate Professor
Person: Academic (Research & Teaching)