University of Birmingham > Talks@bham > Applied Mathematics Seminar Series > Toward small-scale laboratory dynamos

## Toward small-scale laboratory dynamosAdd to your list(s) Download to your calendar using vCal - Vassilios Dallas, Oxford
- Thursday 04 October 2018, 13:00-14:00
- Watson LTB.
If you have a question about this talk, please contact Fabian Spill. The existence of planetary and stellar magnetic fields is attributed to the dynamo instability, the mechanism by which a background turbulent flow spontaneously generates a magnetic field by the constructive refolding of magnetic field lines. Many efforts have been made by several experimental groups to reproduce the dynamo instability in the laboratory using liquid metals. However, so far, unconstrained dynamos driven by turbulent flows have not been achieved in the intrinsically low magnetic Prandtl number $P_m$ (i.e. $Pm = Rm/Re << 1$) laboratory experiments. In this seminar I will demonstrate that the critical magnetic Reynolds number $Rm_c$ for turbulent dynamos in the low $P_m$ limit can be significantly reduced if the flow is submitted to global rotation. Even for moderate rotation rates the required energy injection rate can be reduced by a factor more than 1000. Our finding thus points into a new paradigm for the design of novel liquid metal dynamo experiments. This talk is part of the Applied Mathematics Seminar Series series. ## This talk is included in these lists:Note that ex-directory lists are not shown. |
## Other listsTheoretical Physics Journal Club Type the title of a new list here Jane Langdale## Other talksQuantum Sensing in Space TBC Wave turbulence in the SchrÃ¶dinger-Helmholtz equation TBA Proofs of TurÃ¡n's theorem TBA |