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BEGIN:VEVENT
DTSTAMP:20260428T221312Z
DTSTART;VALUE=DATE-TIME:20180312T150000
DTEND;VALUE=DATE-TIME:20180312T160000
SUMMARY:Vassilios Dallas (Oxford): Toward attaining laboratory turbulent 
 dynamos
TZID:Europe/London
UID:20180312-8a17841b5f2acca4015f5d7a97181ce6@warwick.ac.uk
CREATED:20171027T105716Z
DESCRIPTION:Abstract: The existence of planetary and stellar magnetic fie
 lds is attributed to the dynamo instability\, the mechanism by which a b
 ackground 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 intrinsi
 cally low magnetic Prandtl number $P_m$ (i.e. $Pm = Rm/Re << 1$) laborat
 ory experiments. In this seminar I will demonstrate that the critical ma
 gnetic Reynolds number $Rm_c$ for turbulent dynamos in the low $P_m$ lim
 it can be significantly reduced if the flow is submitted to global rotat
 ion. 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.
 
LOCATION:
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20180327T120112Z
ORGANIZER;CN=Anne-Marie Broomhall:
END:VEVENT
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