On the “film” phenomenon of liquid helium II

Superfluidity: How Quantum Mechanics Became Visible

“…At least qualitatively, the 1938 papers by London and Tisza could explain all the experimental observations which had been already made at that time, namely the fl ow and heat conduction experiments, the heat capacity measurements, also the fast motion of fi lms adsorbed on a wall by Rollin (Kuerti et al 1936 ;Rollin and Simon 1939 ), confi rmed by Daunt and Mendelssohn (Daunt and Mendelssohn 1938 ). But still, when London fi rst heard about Tisza's two fl uid model, he could not believe that, in a liquid, which was pure and simple, there could be two independent velocity fi elds (Tisza 1991 ).…”

Cooling a Macroscopic Mechanical Oscillator close to its Quantum Ground State

“…One straightforward way to lower the thermal resistance without compromising the mechanical quality factor is to use heat removal channels other than conduction through the quartz membrane. While heat removal by conduction through a surrounding gas can be realized with low-pressure 3 He 3 , another interesting solution is to use the heat removal provided by the evaporation of the superfluid 4 He film [RS39,Wil67] that covers the micropillar surface if a sufficient amount of 4 He is available for condensation. Both solutions require a vacuum chamber around the measurement cavity that can be filled with helium gas of either isotope.…”

Elliptic Singular Integro-Differential Operators

“…I n one of these experiments (Daunt and Mendelssohn 1939 a) the transfer rate has been found quite unchanged when one end of the film had been evaporated with an eddy current heater. Another example is provided by the observations on the thermo-mechanical effect in films (Daunt andMendelssohn 1939 b, 1950), where one of the most salient features was the Furthermore, the evaporation rates originally observed by Rollin and Simon (1939), which are of the same order as the normal transfer rate, also refer to film flow in , occurrence of the same transfer rate in thermal as in gravitational flow.…”