Steady state and decay of quantum turbulence generated in channel flows and detected by second sound attenuation
| Thesis title in Czech: | Ustálený stav a rozpad kvantové turbulence generované v proudění kanálem a detekované tlumením druhého zvuku |
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| Thesis title in English: | Steady state and decay of quantum turbulence generated in channel flows and detected by second sound attenuation |
| Key words: | supratekuté hélium, druhý zvuk, kvantová turbulence |
| English key words: | superfluid helium, second sound, quantum turbulence |
| Academic year of topic announcement: | 2012/2013 |
| Thesis type: | diploma thesis |
| Thesis language: | angličtina |
| Department: | Department of Low Temperature Physics (32-KFNT) |
| Supervisor: | prof. RNDr. Ladislav Skrbek, DrSc. |
| Author: | hidden - assigned and confirmed by the Study Dept. |
| Date of registration: | 08.11.2012 |
| Date of assignment: | 09.11.2012 |
| Confirmed by Study dept. on: | 18.01.2013 |
| Date and time of defence: | 27.05.2014 00:00 |
| Date of electronic submission: | 10.04.2014 |
| Date of submission of printed version: | 08.04.2014 |
| Date of proceeded defence: | 27.05.2014 |
| Opponents: | Prof. William Frank Vinen, FRS |
| Advisors: | Simone Babuin, Ph.D. |
| Guidelines |
| Pipe flow and pure superflow through channels of square cross sections with ends covered by sintered silver superleaks and flow of superfluid 4He through a grid will be induced by squeezing a stainless steel bellows system driven by a computer controlled external linear motor. The volume density of quantum vortex line will be detected by the second sound attenuation technique based on flat transducers made of gold-plated nuclepore membranes mounted in the walls of the channel that acts as a second sound resonator. Critical conditions for generation of quantized vorticity, characteristics of developed turbulent steady state and temporal decay of quantum turbulence will be investigated. Obtained experimental results will be interpreted in frame of available theoretical models. |
| References |
| Landau Lifshic: Hydrodynamics
Tilley and Tilley: Superfluidity and superconductivity Donnelly: Quantized vortices in helium II |