F. London and P. R. Zilsel
(1) developped the theory of heat transfer in liquid helium II through a slit. Their formula shows only partial agreement with the measurements. Especially in the measurement of heat transfer through a very narrow slit, the discrepancy is remarkable.
Tomita, Nakajima and Usui
(2) have refined the “two fluid model” by introducing the mutual friction between the superfluid and the normal component as Gorter
(3) had suggested preriously. But in very narrow slite their formula coincides with London-Zilsel's formula and therefore does not agree with the experiments.
Assuming a film of pure superfluid on the wall and introducing a mutual friction somewhat different from that suggested by Gortes, we could get a fairly good agreement with the experiments including the case of very narrow slits. The London-Zilsel's formula is also included as a special case of our formula.
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