Analysis of separation characteristics of multi-layer filter device for oil de-solidification treatment

Lubricating oil is easily polluted by solid particles, leading to lubricating failure which needs to be de-solidified. Mesh filters cannot simultaneously meet the requirements of filtration accuracy and service life. Thus, this study proposes to use a multi-layer filter device for de-solidification treatment. By introducing the critical deposition velocity criterion of particle-wall collision, coupling flow field governing equation and discrete-phase tracking equation, a numerical model for multi-layer filtration of solid particles in oil is established. The effects of the inlet flow rate and number of screen layers on the flow-field characteristics and filtration characteristics were studied, the de-solidification performance of the multi-layer filtration device was explored, and the rationality of the numerical model employed at present work was verified experimentally. Results show that the greater the deposition rate is, the higher the filtration efficiency is, and the more the deposition distribution is inclined to the upstream filter screen. The ratio of pore diameter to particle diameter (kd) that can be effectively handled by the multi-layer filter device is higher than 15.

Automated summary

This study proposes the use of a multi-layer filter device to treat solid particles in lubricating oil. A numerical model is established to investigate the filtration characteristics and de-solidification performance. The results show that a higher deposition rate leads to a higher filtration efficiency and a more upstream deposition distribution.