Abstract
Hollow fiber membranes are used in industrial processes widely. Porosity is one of the important parameters affecting the humidification performance of hollow fiber membrane components. The aim of this study was to analyze the effect of porosity of hollow fiber membrane on humidification performance. In order to perform this analysis, a model based on the finite element method was used to simulate numerically the heat and mass transfer under 6 porosity conditions. Five working conditions with different air flow was considered in order to get more data. The results show that when the porosity increases from 0.35 to 0.8, the humidification performance is greatly improved. However, when it increases from 0.8 to 0.9, the humidification performance is almost unchanged. Considering the humidification performance and support strength of hollow fiber membrane, it is suggested to control the porosity of hollow fiber membrane between 0.65 and 0.8.
Highlights
The solution pump feeded the solution in the constant temperature tank into the hollow fiber membrane humidifier, and the solution flow rate was controlled by the solution pump
In order to study the effect of porosity on humidification performance of countercurrent hollow fiber membrane assembly, the numerical simulation results were analyzed as follows
The increase of air flow leaded to the decrease of moisture content at the air outlet side, which reduced the humidification efficiency
Summary
Porosity is one of the important parameters affecting the humidification performance of hollow fiber membrane components. Peng et al.[19] studied the performance of porous of ceramic membrane elements, and they found that porosity has a great relationship with pure water flux, and the numerical simulation is in good agreement with experimental results. Previous studies showed that porosity is an important parameter affecting the humidification performance of hollow fiber membrane, but they did not point out the specific law of porosity and humidification amount. In order to explore the specific law of porosity and humidification performance, a numerical calculation model of countercurrent hollow fiber membrane humidification component was established in this paper. The humidification performance of polypropylene hollow fiber membrane with porosity of 0.45 was analyzed experimentally and the numerical results were verified. The relationship between the porosity of hollow fiber membrane material and humidification efficiency was obtained, and a reasonable porosity
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