The Behavior of Phobic and Philip Oil Mist Filters Under High Pressure

Abstract

The aim of this paper is to study the changing law of filter media 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. By observing the experimental phenomena produced under different pressures, combining the experimental data and experimental phenomena for qualitative and quantitative analyses, the filter media performance change pattern under different pressures was obtained. 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 media becomes progressively thinner with increasing pressure, and the jump pressure drop becomes smaller while the saturation increases. The saturation of the first layer of the oleophilic filter media increased by 30% and the saturation of the last layer of the oleophobic filter media increased by 80% when the pressure was increased from 1 to 5 MPa. 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 to 25.26 mN/m. The capillary force of filter media B was reduced from 0.20 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 understand ding the variation pattern of filter media performance under high-pressure conditions, and provides a basis for the design and manufacture of filter elements for high-pressure occasions.