DIFFUSION GAS TRANSFER IN HIGH-EXPANSION FOAMS

By analogy with Neumann's approach describing the regularities of diff usion transfer between the cells of two-dimensional foam, the role of cell polyhedrality in three-dimensional high-expansion foam is discuss ed. An expression was obtained that relates the rate of diffusion gas transfer from the cell with its polyhedral structure; the shape of the imaginary ''critical'' cell was found that does not change its size w ith time; the case of low-expansion foam was discussed.