Critical velocities in flows of superfluid 4He

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10510747" target="_blank" >RIV/00216208:11320/25:10510747 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=iUUwtjMtWj" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=iUUwtjMtWj</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1063/5.0262866" target="_blank" >10.1063/5.0262866</a>

Result language
angličtina
Original language name
Critical velocities in flows of superfluid 4He
Original language description
We review and discuss the underlying physics of critical velocities in flows of superfluid He-4 (for historical reasons known as He II). Critical velocities, which indicate changes in the character of quantum three-dimensional flows, are associated with intrinsic as well as extrinsic nucleation of quantized vortices or with generation of quasiparticles-phonons and rotons-and are affected by the length scale of a particular superflow. We consider both dc and ac flows of He II through channels and orifices, as well as flows due to moving or oscillating obstacles of various shapes and sizes in stationary He II. We also consider critical velocities associated with homogeneous and inhomogeneous cavitation, occurring in quantum as well as classical viscous flows of liquid He-4. We discuss relevant theoretical approaches leading to evaluations of critical velocities, focusing on the fundamental case of pure superflow of He II in the zero temperature limit and describe their experimental verification. Additionally, we point out the role of temperature in quantum flows of He II, describe various scenarios of transition to quantum turbulence, and discuss the crucial role of purity and history of the He II samples.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project
<a href="/en/project/GA25-16588S" target="_blank" >GA25-16588S: Quantum turbulence in rotating superfluid 4He</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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