ABSTRACT
When a temperature gradient is present in superfluid helium, there arises in the liquid a macroscopic motion which may be described by using the equations of motion. The macroscopic motion of the normal fluid is accompanied by a transport of heat in the opposite direction. Moreover, apart from this macroscopic heat flux there is also an irreversible heat flow, which according to the analysis of Chap. 9 is expressible in terms of the coefficient of thermal conduction κ by the formula () q = − κ ∇ T https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429502897/20d72e0b-9d39-4175-acc6-a943547edf8a/content/eq570.tif"/>
