"Heat Flush" Method ofHe3Separation

A further experimental study has been made of the efficiency of separation of ${\mathrm{He}}^3$ from mixtures of ${\mathrm{He}}^3$ and ${\mathrm{He}}^4$ in a method making use of the "internal convection" process in superfluid liquid helium. It is shown that the method is capable of removing all the ${\mathrm{He}}^3$ in mixtures with an original ${\mathrm{He}}^3$/${\mathrm{He}}^4$ abundance of ${10}^{-2\mathrm{}}$ percent in a period of about five minutes with a power input of 13 milliwatts. The efficiency of the method as a function of power input is also studied and comparison is made with Kapitza's measurements on the "latent heat" of superfluid atoms.