| Summary: | The effects of length and arrangement of carbon fibers on the pore structure formed by the accumulation of carbon fibers are discussed using two-dimensional network model and computer image processing technology. The results show that with the increase of carbon fiber length, the pore size distribution becomes wider and the average pore size and standard deviation increase. The porosity uniformity first deteriorates and then increases after the fiber length reaches a certain level. With the increase of carbon fiber in the plane X, Y, the difference in orientation arrangement increases. The pore size distribution and the standard deviation of the average pore diameter and the pore diameter are basically the same, but the porosity evenness is deteriorated. Therefore, in order to prepare carbon fiber paper meeting the requirements of mass transfer of proton exchange membrane fuel cells, the fiber length should be as long as possible under other parameters, and the arrangement should be as uniform as possible in all directions in the plane.
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