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Quantitative studies of nonlinear second sound near Tλ

✍ Scribed by Lori S. Goldner; Guenter Ahlers; Ravi Mehrotra

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
242 KB
Volume
165-166
Category
Article
ISSN
0921-4526

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✦ Synopsis

Experimental studies of the nonlinear evolution in time of planar second-sound pulses in superfluid 4He have been carried out a few milliKelvin below Tx. When thermal effects in the second-sound generator and detector are taken into consideration, the data can be quantitatively understood using Burgers' equation to describe sound propagation in the superfluid. A method for extracting the second-sound velocity and damping very near Tx, where nonlinear effects are always important, is described.

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