Mechanically versus thermally generated quantum turbulence of 4He superflow

Abstrakt

An experiment on thermally driven 4He superflow (Chagovets and Skrbek in Phys. Rev.

Lett. 100:215302, 2008; J. Low Temp.

Phys. 153:162, 2008) yielded very different steady state turbulence properties from a nominally identical recent realisation where the helium fountain drive was replaced by bellows. Here we argue that differences are most likely not due to fundamental reasons, but to incorrect velocity calculation in the fountain drive version.

Klíčová slova

• Quantum turbulence
• superfluidity
• second sound
• superflow velocity