Abstract
Belyakov et al. reported in 1987 that they observed no Kapitza resistance when heat flowed from Superfluid helium (He II) to solid (copper). To verify this, we made an experimental apparatus similar to that used by them, which was composed of a cylindrical copper block, two small cells attached to the both ends of the copper block, heaters housed in the cells, and capillary tubes connecting the cells to the superfluid helium bath. Due to its symmetrical configuration, we could easily reverse the direction of heat flow, i.e. from/to He II to/from copper. The results of our measurements showed, however, that the Kapitza conductance was independent on the heat flow direction at the boundary. This fact reconfirms the common understanding on the reversibility of the Kapitza conductance.
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