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National Repository of Grey Literature 14 records found  previous11 - 14  jump to record: Search took 0.00 seconds. 
Experimentální výzkum laminární a turbulentní odporové síly v klasickém a quantovém proudění mezní vrstvy
 Blažková, Michaela ; Schmoranzer, D. ; Skrbek, Ladislav
Various types of oscillating structures have been important for probing the hydrodynamic properties of quantum fluids since the discovery of superfluidity. Both the classical viscous boundary layer flows and the quantum flows due to oscillating objects display transitions from laminar to turbulent drag regime. It is interesting to compare classical and quantum cases.
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Kavitace v kapalném heliu vyvolaná vibrujícím křemenným krystalem
 Blažková, Michaela ; Chagovets, Tymofiy ; Rotter, M. ; Schmoranzer, D. ; Skrbek, Ladislav
An experimental setup containing a quartz tuning fork inside a pressure cell in a glass helium cryostat enables us to experimentally observe effects in liquid He, which we ascribe to cavitation (as these are absent in gaseous He), taking place in the vicinity of the fork. Liquid helium can be prepared extremely clean and wets almost ideally any solid surface – it provides an ideal model system to study cavitation.
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Přechod z laminární do turbulentní odporové síly v proudění vyvolaném vibrujícím křemenným krystalem v normálním a supratekutém heliu
 Blažková, Michaela ; Schmoranzer, D. ; Šindler, M. ; Skrbek, Ladislav
The transition from laminar to turbulent drag regime was observed in normal and superfluid helium. This transition is characterized by critical velocity and we showed, that critical velocity scales as ν.sup.1/2./sup., where ν stands for kinematic viscosity.
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Křemenný krystal - frekvenční standard pro digitální hodinky jako citlivý nástroj pro studium proudění mezní vrstvy
 Blažková, Michaela ; Chagovets, Tymofiy ; Pešička, J. ; Rotter, M. ; Skrbek, Ladislav
We describe basic properties of commercial quartz tuning forks – frequency standards for digital watches which can be used as a very sensitive pressuremeters, thermometers and furthermore they can generate and detect boundary layer flow of cryogenic fluids.
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