| Citation: | GENG Leiming, ZHANG Ruihua, LIU Weihua. Influencing factors of polarization coefficient of hollow fiber membrane[J]. Journal of Aerospace Power, 2025, 40（3）：20220087 doi: 10.13224/j.cnki.jasp.20220087
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The study of concentration polarization, and the analysis of its influencing factors and mechanism are theoretical basis for improving the performance of hollow fiber membrane and the separation efficiency. By establishing a mathematical model of hollow fiber membrane separation of oxygen and nitrogen, the influences of parameters, such as pressure difference between the inside and outside of the filament, initial oxygen concentration of intake air, intake air flow rate and back pressure outside the filament on the polarization coefficient, were analyzed to explore the influence degree of operating parameters on the concentration polarization, and a technical scheme was put forward to reduce the concentration polarization. Factors such as pressure difference between the inside and outside of the filament, initial oxygen concentration of intake air, intake air flow rate, and back pressure outside the filament had a certain effect on the polarization coefficient, among them, the polarization coefficient was positively correlated with pressure difference inside and outside of the filament, initial oxygen concentration of intake air, and back pressure outside the filament, and was negatively correlated with intake air flow. Negative pressure suction on the permeation side can be used to increase the membrane permeation flow rate and reduce the concentration polarization. The influence of concentration polarization on membrane performance was reduced by controlling various factors.
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