The non-eguilibrium thermodynamical treatment of liguid
4He II by DE GROØT, JANSEN and MAZUR is extended to the case of liguid II mixture
3He-
4He. The mixture is enclored in two mutually communieating reseruoirs kept at different temperatures Τ and Τ+ΔΤ. One Type of communication considered is such that the
3He component cannot pass through the connection (e. g. surface film). In this care the induced thermo-mechanical effect is shown to consist additively of two effects: the thermo-mechamical effect due to
4He components and the osmotic pressure due to
3He component (Eq. (3.8)). Another type is such that it allows all the components to pass through. To the difference of
3He concentration Δξ
3 we turn our particular attention in this case. The difference can be separated into two mutually opposing terms and it can then be expected that the quantity Δξ
3/ΔΤ becomes larger with increasing width of the capillary. It is highly desirable to that this effect experimentally.
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