000014003 001__ 14003
000014003 005__ 20161115094008.0
000014003 04107 $$aeng
000014003 046__ $$k2016-08-21
000014003 100__ $$aCuevas, Sergio
000014003 24500 $$aFree surface vortex instability in magnetically driven liquid metal swirling flow

000014003 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000014003 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000014003 506__ $$arestricted
000014003 520__ $$2eng$$aWe describe experimental observations of a free surface vortex instability in a shallow liquid metal layer driven by different arrays of rotating magnetized bars located underneath the bottom of a cylindrical container. For layer thicknesses smaller than a certain threshold, the swirling vortex flow created by induced Lorentz forces reveals a spontaneous instability for specific magnet rotation frequencies, leading to the opening of the free surface and the formation of regular structures that rotate stably with a speed about one order of magnitude lower than the magnets. An ellipse and a triangle are observed for one and three rotating magnets. When four or five magnets are used, transient polygons with the same number of corners appear on the deformed surface at the initial stages of spin-up. It is suggested that the formation of the structures is a consequences of resonant interactions between gravity and centrifugal waves.

000014003 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000014003 653__ $$a

000014003 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000014003 720__ $$aCuevas, Sergio
000014003 8560_ $$ffischerc@itam.cas.cz
000014003 8564_ $$s178160$$uhttps://invenio.itam.cas.cz/record/14003/files/PO.FM15-1.02.76.pdf$$yOriginal version of the author's contribution as presented on CD, XMLout( page 1548, code PO.FM15-1.02.76).
000014003 962__ $$r13812
000014003 980__ $$aPAPER