2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/83503The usable limits of the customary and relaxational filtrational theories are considered. The questions of applicable the locality and local thermodynamical equilibrium principles to depict the nonstationary flows are discussed. The experimental procedures are proposed to determine the filtrational flows relaxation times.5 pages, RevTEXFluid Dynamicstext