Experimental investigations of liquid helium flows
| Thesis title in Czech: | Experimentální studium proudění tekutého helia |
|---|---|
| Thesis title in English: | Experimental investigations of liquid helium flows |
| Key words: | hélium|supratekutost|kvantová turbulence|vizualizace proudění|druhý zvuk |
| English key words: | helium|superfluidity|quantum turbulence|flow visualization|second sound |
| Academic year of topic announcement: | 2017/2018 |
| Thesis type: | dissertation |
| Thesis language: | angličtina |
| Department: | Department of Low Temperature Physics (32-KFNT) |
| Supervisor: | doc. Dr. Marco La Mantia, Ph.D. |
| Author: | RNDr. Patrik Švančara, Ph.D. - assigned and confirmed by the Study Dept. |
| Date of registration: | 20.09.2017 |
| Date of assignment: | 20.09.2017 |
| Confirmed by Study dept. on: | 04.10.2017 |
| Date and time of defence: | 22.09.2021 09:30 |
| Date of electronic submission: | 02.06.2021 |
| Date of submission of printed version: | 02.06.2021 |
| Date of proceeded defence: | 22.09.2021 |
| Opponents: | Nicolas Mordant |
| prof. Ing. Václav Uruba, CSc. | |
| Advisors: | prof. RNDr. Ladislav Skrbek, DrSc. |
| Guidelines |
| The visualization of flows of superfluid helium 4 (He II) has given in recent years a significant contribution to our understanding of quantum turbulence. Relatively small particles are suspended in the liquid and their flow-induced motions are investigated in order (i) to reveal the quantum features of He II flows and (ii) to investigate relevant (possible) similarities with classical (viscous) flows. The work main aim is to study selected quantum flows not only by visualization but also by using other tools, starting from the second sound attenuation technique. The implementation of such a tool in the current low-temperature visualization setup is far from being trivial but the advantage will be that the same flow can be investigated, at the same time, by using (at least) two different approaches. The following step will be to implement in the setup other sensors. For example, it has been shown that it is possible to visualize the vortical structures shed by bodies moving in liquid helium but the forces experienced by these bodies have yet to be directly measured. Suitable sensors, such as accelerometers and load cells, could then be used in order to record these forces. In summary, experimental studies of selected liquid helium flows will be performed by using, at the same time, both well-established and novel techniques, the main purpose being to investigate in unprecedented detail similarities and differences between the behaviour of viscous and quantum fluids, an active and challenging field of scientific research, with far-reaching implications. |
| References |
| * D. Duda, P. Švančara, M. La Mantia, M. Rotter and L. Skrbek (2015) Physical Review B 92:064519
* W. Guo, M. La Mantia, D. P. Lathrop and S. W. Van Sciver (2014) Proceedings of the National Academy of Sciences of the USA 111:4653 * M. La Mantia and L. Skrbek (2014) Europhysics Letters 105:46002 * M. La Mantia and L. Skrbek (2015) Physical Review B 90:014519 * M La Mantia, P. Švančara, D. Duda and L. Skrbek (2016) Physical Review B 94:184512 * M. Raffel, C. E. Villert, S. T. Werely and J. Kompenhans (2007) Particle image velocimetry - a practical guide, Springer * Y. A. Sergeev and C. F. Barenghi (2009) Journal of Low Temperature Physics 157:429 * L. Skrbek et al. (2011) Fyzika nízkých teplot, Matfyzpress * L. Skrbek and K. R. Sreenivasan (2012) Physics of Fluids 24:011301 * M. Van Dyke (1982) An album of fluid motion, Parabolic Press * E. Varga, S. Babuin and L. Skrbek (2015) Physics of Fluids 27:065101 |