Heat transfer under pulsed heating in superfluid helium
V.B. Efimov1, А.А. Оrlova1, L.P. Kondaurova2, and А.G. Gorkun1,3
1Institute of Solid State Physics RAS, 2 Academician Ossipyan Str., Chernogolovka 142432, Russia
2Institute of Thermophysics, 1 Lavrentyev Ave., Novosibirsk 630090, Russia Novosibirsk State University, Novosibirsk, Russia
3Astrakhan State University, 20a Tatischev Str., Astrakhan, Russia
Received March 12, 2019, published online July 26, 2019
An experimental study of the propagation of longterm (up to 1000 μs) heat pulses showed that for heat transfer, the formation of a vortex field near the heater on characteristic dimensions of the order of several millimeters is crucial, which blocks further countercurrent of the normal and superfluid components and development of turbulence in the entire waveguide volume.
Key words: superfluid helium, thermal conductivity, backflow of normal and superfluid components, quantum vortices.