Lagrangian velocity distributions in thermal counterflow of superfluid He-4

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F13%3A10173325" target="_blank" >RIV/00216208:11320/13:10173325 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1051/epjconf/20134501005" target="_blank" >http://dx.doi.org/10.1051/epjconf/20134501005</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/epjconf/20134501005" target="_blank" >10.1051/epjconf/20134501005</a>

Result language
angličtina
Original language name
Lagrangian velocity distributions in thermal counterflow of superfluid He-4
Original language description
Quantum turbulence in thermal counterflow of superfluid He-4 is visualized and studied at length scales comparable to the average distance between quantized vortices. The lagrangian velocities of micrometer-sized deuterium particles are obtained in a planar section of the flow field by using the particle tracking velocimetry technique. It is shown that the lagrangian velocity normalized distributions are strongly non-gaussian, with power-law tails, in contrast to the nearly gaussian distributions obtained in classical turbulent flows. The average distance between quantized vortices can therefore be seen as the length scale indicating the transition between classical-like and quantum behavior in thermal counterflow of superfluid He-4.
Czech name
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Czech description
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Project
<a href="/en/project/GAP203%2F11%2F0442" target="_blank" >GAP203/11/0442: Visualization of liquid helium flows</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2013
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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