Study on the Effect of Porosity on Countercurrent Hollow Fiber Membrane Humidification System

Abstract The effect of porosity on the humidification efficiency of countercurrent hollow fiber membrane humidification system was investigated by using numerical simulation method to study polypropylene (PP) porous fiber membrane material. Firstly, the correctness of the numerical model was verified by experiments, and then the influence of porous fiber membrane material on humidification efficiency was further explored by changing the porosity of the model. The simulation results show that the humidification capacity and efficiency of the humidification component increase with the increase of porosity. When the porosity is between 0.35-0.8, the humidification capacity and efficiency increase significantly. However, when the porosity is between 0.8-0.9, although the humidification amount and humidification efficiency value are high, the increment is not obvious, and the porosity of the fiber film is inversely proportional to the support strength of the film, and the larger the porosity is, the shorter the service life of the film material is. Therefore, it is suggested to design the porosity of polypropylene (PP) film material between 0.65 and 0.8. It can not only ensure the high humidification capacity and efficiency of the fiber membrane, but also prolong the service life of the membrane.