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SUMMARY:Blowing a fuse and the dynamic double helix - Jonathan Mestel\, Im
 perial
DTSTART:20060619T120000Z
DTEND:20060619T130000Z
UID:TALK4881@talks.cam.ac.uk
CONTACT:Stephen J. Cowley
DESCRIPTION:Two unrelated problems are discussed. In the first\, the break
 down of an electric fuse is considered. It is assumed that the wire melts 
 and the liquid pinches off in finite time. Similarity solutions close to p
 inchoff are sought in the longwave limit and compared with high-speed phot
 ographic images.\n\nThe second problem considers the dynamo produced by la
 minar flow of conducting fluid down helical pipes. Such steady flow genera
 tes magnetic field spontaneously. Animations of the fully nonlinear behavi
 our of this dynamo are presented\, showing oscillations\, quenching and re
 versal. Calculations are extended to two interwoven helical pipes which dr
 ive a dynamo in a wider range of Reynolds numbers. 
LOCATION:MR14\, DAMTP
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