The coefficient of heat transfer in narrow channels with boiling nitrogen has been determined experimentally.

As an example, Fig. 4 presents the experimental [3] and theoretical [by formula (22)] dependences of w m on L x for water and acetone for three oxidized specimens of MFS. On the basis of the above, it was assumed in the calculations that cos @ = cos 60 ~ = 0.5. There is satisfactory agreement between the experimental data and the calculation.NOTATION II, porosity of the structure; H/m, limit porosity; dB, fiber diameter; lB, length; diit, size of the contact spot; KKC, coefficient of liquid permeability of the capillary structure; PK, capillary pressure; Ap/, viscous pressure losses in the liquid; w, filtration rate; win, mean axial speed of the liquid; Lx, distance from the beginning of absorption; ~, time from the beginning of absorption; ~, angle between the longitudinal axis of the specimen and the horizontal plane; | boundary wetting angle; o, capillary constant of the liquid; p, dynamic coefficient of viscosity of the liquid; c, c 1, c 2, c', proportionality coefficients.

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