Systems and methods for rotating coalescers maintaining positive recirculation through a dynamic seal

A crankcase ventilation system, comprising:

• a housing;
• an inlet configured to receive blowby gases and direct the blowby gases into the housing;
• an outlet configured to direct filtered blowby gases out of the housing;
• a rotating separating element positioned within the housing such that a gap exists between the rotating separating element and the housing, wherein the rotating separating element comprises a dirty side in communication with the blowby gases and a clean side in communication with the filtered blowby gases and separated oil from the blowby gases, wherein the gap permits gas flow between the clean side of the rotating separating element and the dirty side of the rotating separating element;
• and
• a central shaft coupled to the rotating separating element, the central shaft rotatable such that when the central shaft rotates, the rotating separating element rotates and creates a pumping pressure that causes higher pressure at the clean side of the rotating separating element and relative to the dirty side of the rotating separating element, thereby causing a positive recirculation of the blowby gases in which a portion of the filtered blowby gases from the clean side of the rotating separating element returns through the gap to the dirty side of the rotating separating element.