Original scientific paper
Observation of laser-induced microscale vortex ring interactions on vaporizing metal surface
Stjepan Lugomer
; Ruđer Bošković Institute, Bijenička 54, 10001 Zagreb, Croatia
Abstract
Laser-induced microscale vortex rings have been generated on vaporizing tantalum surface, and their reconnection was studied in the presence of shock waves on the nanosecond time scale. A rich spectrum of the ring structures was obtained, some of which have been observed for the first time. Qualitatively, three classes of interactions are distinguished on the basis of relative relation of the shock momentum Ps and momentum of the circulating fluid Pc: interactions in the presence of low momentum shock waves (Ps < Pc), of the shock waves with a momentum comparable to the momentum of the circulating fluid (Ps ≈ Pc) and of the shock waves with a momentum larger than momentum of the circulating fluid (Ps > Pc).
Keywords
laser-induced microscale vortex rings; tantalum surface; reconnection of rings; shock waves; ring structures
Hrčak ID:
300883
URI
Publication date:
1.7.1998.
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