Superheating and bubble formation in Helium II

✍ Scribed by G. Krafft

• Book ID: 104626089
• Publisher: Springer US
• Year: 1978
• Tongue: English
• Weight: 535 KB
• Volume: 31
• Category: Article
• ISSN: 0022-2291
• DOI: 10.1007/bf00115095

✦ Synopsis

Heat transport experiments with superfluid helium in pipes of 60-400 cm length and diameters between 0.3 and 1.0 cm show the existence of a critical heat current when superfluidity breaks down and vaporization onset starts. In all measurements of the critical heat flux density where breakdown of superfluid cooling occurred, the maximum temperature for the start of bubble formation proved to be not the thermodynamic limit or saturation temperature Ts (temperature at which the coexistence curve is reached), but a temperature Tm which was 0.1-0.4K higher. The magnitude and temperature dependence of the measured metastable superheating AT1 = Tm-T~ can be explained by the assumption that nucleation occurs on the superfluid vortex lines or vortex rings.