Visualization of particle motions in superfluid helium flows
| Thesis title in Czech: | Vizualizace pohybů částic v proudění supratekutého helia |
|---|---|
| Thesis title in English: | Visualization of particle motions in superfluid helium flows |
| Key words: | fyzika nízkých teplot; supratekutost; kvantová turbulence; mechanika tekutin; vizualizace proudění |
| English key words: | low temperature physics; superfluidity; quantum turbulence; fluid mechanics; flow visualization |
| Academic year of topic announcement: | 2019/2020 |
| Thesis type: | rigorosum thesis |
| Thesis language: | angličtina |
| Department: | Department of Condensed Matter Physics (32-KFKL) |
| Supervisor: | doc. Dr. Marco La Mantia, Ph.D. |
| Author: | hidden - assigned and confirmed by the Study Dept. |
| Date of registration: | 24.10.2019 |
| Date of assignment: | 24.10.2019 |
| Confirmed by Study dept. on: | 24.10.2019 |
| Date and time of defence: | 20.11.2019 00:00 |
| Date of electronic submission: | 24.10.2019 |
| Date of submission of printed version: | 24.10.2019 |
| Date of proceeded defence: | 20.11.2019 |
| Guidelines |
| The motions of relatively small particles in selected flows of superfluid helium 4 (He II) are experimentally visualized 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 specifically discusses the relation between the derived flow properties, such as the particle velocity distribution, and the length scale probed by the particles. Quantum features may indeed appear at small enough length scales, smaller than the quantum scale of the flow, the average distance between quantized vortices, while, at larger flow length scales, a viscous-like picture may emerge. The work therefore aims at giving a significant contribution to the study of quantum flows, an active and challenging line of scientific enquiry, with far-reaching implications. |
| References |
| * R. J. Donnelly (1991) Quantized vortices in Helium II, Cambridge University Press
* 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 111:4653-4658 * M. La Mantia and L. Skrbek (2014) Europhysics Letters 105:46002 * M. La Mantia and L. Skrbek (2015) Physical Review B 90:014519 * H. Lamb (1945) Hydrodynamics, Dover Publications * S. B. Pope (2000) Turbulent flows, Cambridge University Press * M. Raffel, C. E. Villert, S. T. Werely and J. Kompenhans (2007) Particle image velocimetry - a practical guide, Springer * M. Samimy, K. S. Breuer, L. G. Leal and P. G. Steen (2003) A gallery of fluid motion, Cambridge University Press * Y. A. Sergeev and C. F. Barenghi (2009) Journal of Low Temperature Physics 157:429-479 * 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 |