Numerical and Experimental Study of Rayleigh–Bénard–Kelvin Convection

• Published in: Flow, turbulence and combustion Vol. 92; no. 1-2; pp. 371 - 393
• Main Authors: Kenjereš, S., Pyrda, L., Fornalik-Wajs, E., Szmyd, J. S.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Dordrecht Springer Netherlands 2014; Springer
• Subjects: Automotive Engineering; Buoyancy-driven instability; Convection and heat transfer; Engineering; Engineering Fluid Dynamics; Engineering Thermodynamics; Exact sciences and technology; Fluid dynamics; Fluid- and Aerodynamics; Fundamental areas of phenomenology (including applications); Heat and Mass Transfer; Hydrodynamic stability; Physics; Turbulent flows, convection, and heat transfer; Natural convection; Magnetization force; Turbulent heat transfer; Paramagnetic fluid; Convective instabilities; Test facilities; Magnetization; Digital simulation; Boundary conditions; Cubic shape; Experimental study; Cavity flow; Rayleigh-Benard instability; Flow regime; Paramagnetic properties; Magnetic fields; Heat transfer
• ISSN: 1386-6184; 1573-1987
• DOI: 10.1007/s10494-013-9490-8

We performed experimental and numerical studies of combined effects of thermal buoyancy and magnetization force applied on a cubical enclosure of a paramagnetic fluid heated from below and cooled from top. The temperature difference between the hot and cold wall was kept constant. After considering neutral situation (i.e. a pure natural convection case), magnetic fields of different intensity were imposed. The magnetization force produced significant changes in flow (transition from laminar to turbulent regimes), wall-heat transfer (enhancement) and turbulence (turbulence structures reorganization). The strong magnetic field and its gradients were generated by a superconducting magnet which can generate magnetic field up to 10 T and where gradients of the magnetic induction can reach up to 900 T 2 /m. A good agreement between experiments and numerical simulations was obtained in predicting the integral wall heat transfer over entire range of considered working parameters. Numerical simulations provided a detailed insights into changes of the local wall-heat transfer and long-term time averaged first and second moments for different strengths of the imposed magnetic induction.