Physical and chemical bases of processes underlying foam separation into initial phases under action of physical and mechanical factors and various physical fields, including acoustic, electric and thermal, are considered. Much attention is paid to the capillary properties of foam, hydromechanical processes of foam flow and destruction in channels and in the vicinity of hard surfaces. Based on the proposed classification of mechanical foam suppressors, the issues of modeling and calculation of foam separation and destruction processes in static and dynamic foam suppressors are considered in detail.