TY - JOUR
T1 - Turbulence in boundary flow of superfluid He4 triggered by free vortex rings
AU - Goto, R.
AU - Fujiyama, S.
AU - Yano, H.
AU - Nago, Y.
AU - Hashimoto, N.
AU - Obara, K.
AU - Ishikawa, O.
AU - Tsubota, M.
AU - Hata, T.
PY - 2008/2/1
Y1 - 2008/2/1
N2 - The transition to turbulence in the boundary flow of superfluid He4 is investigated using a vortex-free vibrating wire. At high wire vibration velocities, we found that stable alternating flow around the wire enters a turbulent phase triggered by free vortex rings. Numerical simulations of vortex dynamics demonstrate that vortex rings can attach to the surface of an oscillating obstacle and expand unstably due to the boundary flow of the superfluid, forming turbulence. Experimental investigations indicate that the turbulent phase continues even after stopping the injection of vortex rings, which is also confirmed by the simulations.
AB - The transition to turbulence in the boundary flow of superfluid He4 is investigated using a vortex-free vibrating wire. At high wire vibration velocities, we found that stable alternating flow around the wire enters a turbulent phase triggered by free vortex rings. Numerical simulations of vortex dynamics demonstrate that vortex rings can attach to the surface of an oscillating obstacle and expand unstably due to the boundary flow of the superfluid, forming turbulence. Experimental investigations indicate that the turbulent phase continues even after stopping the injection of vortex rings, which is also confirmed by the simulations.
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U2 - 10.1103/PhysRevLett.100.045301
DO - 10.1103/PhysRevLett.100.045301
M3 - Article
AN - SCOPUS:38849209042
SN - 0031-9007
VL - 100
JO - Physical Review Letters
JF - Physical Review Letters
IS - 4
M1 - 045301
ER -