engleski

Observation of Laser-Induced Microscale Knotted and Unknotted Vortex Filaments on Vaporizing Tntalum Surface

Laser -induced Ta-surface superheating on a ns time scale is connected with the formation of a spinoidal fluid which decomposes into gaseous phase through microexplosions, generating vortex filament structure on the vaporizing surface. Vortex filaments associated with the Reynolds number Re ~ 10e3 - 10e4 are organized into regular, quasiregular, or chaotic structures. Homotopic operations transfer these structures into irreducible ones of a simple closed-loop type, showing that all of them are embedded in a three-dimensional torus either as a vortex ring (unknoted knot), as a cloverleaf (trefoil knoted knot), or as Hopf links (knoted knot).

Laser; Ablation; vortex filaments; Kntted structures; Hopf link

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