Experimental Thermo-Magnetic Convection Analysis in Tall Rectangular Enclosure

An Analysis of a Laminar-Turbulent Transition and Thermal Plumes Behavior in a Paramagnetic Fluid Subjected to an External Magnetic Field

“…The presented results and their analysis indicate that the transition from laminar to turbulent character of the flow in a geometry with a smaller aspect ratio than 1 occurs for Ra TM = 2.58 × 10 7 in a case with ∆T = 5 • C, and for Ra TM = 1.43 × 10 7 for ∆T = 11 • C, which is compatible with the conclusions in [42] for cubical geometry, and is in near agreement with [33]. Further research, involving geometries with a greater range of aspect ratios, is needed to determine an accurate scale for laminar-turbulent transition in thermomagnetic convection.…”

“…Additionally, they presented basic information about the evolution of thermal plumes and coherent structures with increasing strength of the magnetic field showing the dynamizing action of the imposed magnetic field. The transition from laminar to turbulent flow was determined as 3 × 10 7 for cubical geometry, and 4 × 10 7 to 1.3 × 10 8 for a tall enclosure (aspect ratio AR = height/width = 2) [33]. A comparison of thermo-magnetic convection, heat transfer and basic spectral analysis for vessels with aspect ratios 0.5 and 2.0 for the experimental results was presented in [34], indicating that the heat transfer enhancement, as well as fluid flow structure, strongly depends on the geometry height.…”