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The boiling-up process in He II: optical measurements and visualization

✍ Scribed by M.v. Schwerdtner; G. Stamm; A.N. Tsoi; D.W. Schmidt

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 545 KB
Volume: 32
Category: Article
ISSN: 0011-2275
DOI: 10.1016/0011-2275(92)90308-w

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✦ Synopsis

The boiling-up process in superfluid helium was measured by an optical method and compared with previous experiments of other authors. The influence of the different pulse triggering rates was removed by introducing a dimensionless parameter. It appears that the reported new method is much more sensitive than those used in former investigations and gives the possibility of a visualization of the whole process. Further, vapour bubbles with finite dimensions (diameter of the order of 1 cm) were observed in the bulk liquid. Depending on the remaining liquid column (or hydrostatic pressure head) above the heater, these bubbles have a life-time of up to 50 ms. The lower the pressure head, the longer is the life-time of the bubbles.

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