Instability of a vortex ring due to toroidal normal fluid flow in superfluid 4He
نویسندگان
چکیده
منابع مشابه
Fluid pinch-off in superfluid and normal 4He.
We present frames from high-speed videos of the pinch-off of liquid 4He droplets. The temperature of the fluid droplets ranged from 1.33 K to 4.8 K, and the size of the drops was proportional to the temperature-dependent capillary length. We observed no qualitative difference between pinch-off in the normal and superfluid states. In both cases, the shape of the fluid in the final stages of pinc...
متن کاملObservation of single-vortex pinning in superfluid 4He
Flow-induced pinning and unpinning of vortices have been investigated experimentally in superfluid 4He at temperatures varying from 14 to 44mK. The lifetime and unpinning velocities of pinned vortices could be measured by following the apparent changes of the critical velocity for phase slips. The pinned vortex size and location can be deduced from the magnitude of these changes and are found, ...
متن کاملDirect measurement of quantum phase gradients in superfluid 4He flow.
We report a new kind of experiment in which we generate a known superfluid velocity in a straight tube and directly determine the phase difference across the tube's ends using a superfluid matter wave interferometer. By so doing, we quantitatively verify the relation between the superfluid velocity and the phase gradient of the condensate macroscopic wave function. Within the systematic error o...
متن کاملCovariant Vortex In Superconducting–Superfluid–Normal Fluid Mixtures with Stiff Equation of State
The integrals of motion for a cylindrically symmetric stationary vortex are obtained in a covariant description of a mixture of interacting superconductors, superfluids and normal fluids. The relevant integrated stress–energy coefficients for the vortex with respect to a vortex–free reference state are calculated in the approximation of a “stiff”, i.e. least compressible, relativistic equation ...
متن کاملQuantum Evaporation from Superfluid 4He
The quantum evaporation experiments of Brown and Wyatt have been re-analysed in the light of a recent measurement of the high-energy phonon spectrum created by a pulse-heated thin film. Two sources of systematic error become significant at the level of the precision required by this new analysis: firstly, in the detector position which is recalibrated by using large-angle roton evaporation; and...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: EPL (Europhysics Letters)
سال: 2020
ISSN: 1286-4854
DOI: 10.1209/0295-5075/129/16001