Vliv geometrie na vývoj proudění supratekutého hélia-4
| Thesis title in Czech: | Vliv geometrie na vývoj proudění supratekutého hélia-4 |
|---|---|
| Thesis title in English: | Role of geometry on the development of flows of superfluid helium-4 |
| Academic year of topic announcement: | 2022/2023 |
| Thesis type: | dissertation |
| Thesis language: | |
| Department: | Department of Low Temperature Physics (32-KFNT) |
| Supervisor: | doc. Dr. Marco La Mantia, Ph.D. |
| Author: | |
| Advisors: | prof. RNDr. Ladislav Skrbek, DrSc. |
| Guidelines |
| The investigation of flows of superfluid helium-4 (He II) is an active and challenging research field, which is not only interesting in its own right but that has also broader implications, related, for example, to turbulence in viscous fluids or to neutron stars.
The work aim is to study experimentally selected He II flows in order the quantify the influence of the flow geometry on the development of such flows, which is a topic that has received little attention to date. It is, for example, yet to be firmly established how the shape of an object oscillating in He II may affect the generated flow behaviour or how a solid boundary may influence the motion of superfluid helium-4, a quantum fluid characterized by unique properties, compared to those of classical (viscous) fluids, such as water or air. Indeed, adequate comparisons with the observed behaviour of similar flows of classical fluids are deemed to be instrumental in addressing these unsolved physical problems. Flow visualization, which has given in recent years significant contributions to our understanding of He II flows, will be the main experimental tool used to achieve the work aim. Relatively small solid particles are suspended in the liquid and their flow-induced motions are collected by digital cameras. It is also envisaged that other tools, such as the second sound attenuation technique and direct force measurement, by means of suitable accelerometers and load cells, will be employed during the project duration. The research will be performed at the cryogenic visualization laboratory of the Department of Low Temperature Physics, which was the first one to be established in Europe and that can be regarded as one of the leading laboratory in this research field. |
| References |
| C. F. Barenghi, L. Skrbek and K. R. Sreenivasan, Introduction to quantum turbulence, Proc. Natl. Acad. Sci. U. S. A. 111, 4647 (2014)
W. Guo, M. La Mantia, D. P. Lathrop and S. W. Van Sciver, Visualization of two-fluid flows of superfluid helium-4, Proc. Natl. Acad. Sci. U. S. A. 111, 4653 (2014) M. La Mantia, Particle dynamics in wall-bounded thermal counterflow of superfluid helium, Phys. Fluids 29, 065102 (2017) M. La Mantia, P. Švančara, D. Duda and L. Skrbek, Small-scale universality of particle dynamics in quantum turbulence, Phys. Rev. B 94, 184512 (2016) M. S. Mongiovì, D. Jou and M. Sciacca, Non-equilibrium thermodynamics, heat transport and thermal waves in laminar and turbulent superfluid helium, Phys. Rep. 726, 1 (2018) P. Švančara, P. Hrubcová, M. Rotter and M. La Mantia, Visualization study of thermal counterflow of superfluid helium in the proximity of the heat source by using solid deuterium hydride particles, Phys. Rev. Fluids 3, 114701 (2018) P. Švančara and M. La Mantia, Flows of liquid 4He due to oscillating grids, J. Fluid Mech. 832, 578 (2017) E. Varga, S. Babuin and L. Skrbek, Second-sound studies of coflow and counterflow of superfluid 4He in channels, Phys. Fluids 27, 065101 (2015) |