Abstract
We proposed a novel nanofiber manufacturing technology by melt-blowing process. In the present report, we focused on manufactured polypropylene nanofiber nonwoven fabric as a novel sound absorbing material, measuring its Biot acoustic parameters, and also performed its CFD (Computational Fluid Dynamics)analysis to discuss flow resistance in them. Especially, we looked at the influence of the gap ratio (the ratio of the fiber gab between fibers and fiber diameter, which was related to the porosity), Knudsen number and the thermal characteristic length on the sound absorption coefficient and the flow resistance. As a result, it can be seen that the sound absorption coefficient and the flow resistance are greatly affected by the gap between the fibers. Moreover, the gap ratio and the thermal characteristic length are found to be essential parameters under the constant gap between fibers.
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