多孔質焼結体中への液体の浸透機構

概要

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A model consists of a rectangular parallelopiped porous skeleton, which has a straight-cylindrical pores crossing at right angles on three dimensions, is set up, and the liquid was assumed to penetrate into the pores with laminar flow by the capillary and the gravitation forces. The general equation of infiltration introduced in a previous paper was made under the above conditions. In this paper, the general equation of penetration, where the elevating liquid speed from the bottom to the upper of the skeleton having a larger height, was newly produced by reconstruction of the above general equation. This new equation was confirmed by experiments on penetration of aqueous solutions into sintered glass powder porous compacts. The new general equation of penetration is shown as follows; t=72ηL⋅h∞/R2⋅ρ⋅g⋅∞Σn=2 1/n (h/h∞)n where, h:penetrating height of liquid(m), R: radius of pore(m), h∞: equilibrium penetrating height of liquid(m), which equals to 2 γLV⋅cos θ∞/R⋅ρ⋅g, γLV: surface tension of liquid (N/m), θ∞: equilibrium contact angle between skeleton and liquid(deg), η L: viscosity of liquid(Pa⋅S), t : penetrating time(s), ρ : density of liquid(kg/m3), and g: constant of gravitation(m/s2).
社団法人粉体粉末冶金協会の論文