Abstract
When studying filtration for materials with a high porosity (higher than 0.80) and large pore sizes (1–5 mm), the capillary model structure, traditionally used in powder metallurgy, cannot be regarded as adequate to the actual processes that occur. The physical picture of the motion of a liquid in a layer of highly porous cellular material can be defined as the flow of a liquid around a spatial framework (the "external" problem of hydrodynamics). For pressure filtering in a highly porous cellular material, three characteristic types of motion of the liquid are observed: laminar undetached flow (Re 10).
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