The behavior of phobic and philic oil mist filters under high pressure

Abstract

Abstract The aim of this paper is to study the changing law of filter material properties under high pressure conditions, and for this purpose an experimental setup was established to measure the properties of filter materials at a maximum pressure of 5 MPa. The experiments were carried out at a pressure of 1–5 MPa, and the detailed experiments were conducted on the pressure drop, saturation and the liquid distribution pattern of the first and last layers of the filter material. The experimental results show that the liquid film on the surface of the filter material becomes progressively thinner with increasing pressure, and the jump pressure drop becomes smaller while the saturation increases. In addition, the results show that with increasing pressure, the surface tension of the droplets decreases and the surface tension of the DEHS decreases from 28.72 mN/m to 25.26 mN/m. The capillary force of filter material B was reduced from 0.20 mN to 0.13 mN, a 35% reduction in capillary force. which changed the distribution of droplets on the fibres and enhanced the wettability of the filter material. This discovery is of great significance for understanding the variation pattern of filter material performance under high pressure conditions, and provides a basis for the design and manufacture of filter elements for high pressure occasions.