Simulation on the Fouling Mechanism of Micro-pore Filter Membrane in Size of 10 μm with FLOW-3D
LU Jixia1, LU Wenhao1, ZHAO Zihe2, ZHAO Xiuqi1, WANG Shan1
1. School of Mechanical, Electronic and Information Engineering, China University of Mining and Technology, Beijing 100083; 2. Patent Examination Cooperation Jiangsu Center of the Patent Office, Suzhou 215000
Abstract：The mechanism of membrane pore fouling has mainly been determined by fouling index which is obtained by analyzing the filtrate flux data based on the filter classical fouling models so far. However, it is better to understand the filter fouling mechanism by visualizing the membrane plugging process with a simulation model. Taken a 10 μm micro-pore filter membrane as an example, the relationship between membrane fouling and the position and the inclination angle of particles with size close to membrane pore size relative to filter membrane are studied by using FLOW-3D software. Furthermore, the principles of the bridge interception of the particles by the membrane pores are also discussed. The results show that a single particle can be intercepted when its short diameter is larger than the pore size. Usually, a particle whose short diameter is smaller than the pore size will pass through the membrane only when it is located just above the membrane pore and its short diameter is close to the pore size, and meanwhile the direction of its long diameter is parallel to the membrane pore. The surface of a particle trapped in a pore suffers from a big dragging force. The combination of small particles and large particles can cause a stable bridge. Bridging interception is the main way for the deposition of particles that both the long and short diameters are smaller than the membrane pore size. When the particles with a certain size distribution pass through the microporous membrane, the interception of large particles occurs first, and then the bridging between small particles, and the combination of these two mechanisms leads to membrane pore plugging. The simulation model are validated through plugging test of actual polluted oil sample on micro-pore filter membrane. The simulation results can provide a reference for studying the quantitative detection model of contaminated oil samples based on filter fouling.
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LU Jixia, LU Wenhao, ZHAO Zihe, ZHAO Xiuqi, WANG Shan. Simulation on the Fouling Mechanism of Micro-pore Filter Membrane in Size of 10 μm with FLOW-3D. Journal of Mechanical Engineering, 2020, 56(14): 207-215.
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