Impregnation of blind capillaries in harmonic variation of fluid pressure

A mathematical model is constructed describing with account of inertia forc es the impregnation of blind and quasi-blind capillaries in the case of a v arying fluid pressure. The possibility is considered of resonance fluid osc illation in coarse capillaries. Formulas are derived for calculating the re sonance frequency, phase shift between the pressure and fluid front displac ement, and critical frequency corresponding to the predominance of friction forces over the elastic force associated with entrapped gas.