Penetration of Windborne Long Fibers into Openings

A study was conducted to provide a set of experimental data on penetration of long fibers (0.635 cm) with a diameter of 8 #Lm through orifices of various dimensions under controlled wind speeds ranging between 130 and 450 cm/sec. The dependence of fiber penetration on orifice shape, size, and orientation was examined systematically for several airflow rates. The measurements demonstrate that the penetration efficiency of fibers varies widely for different experimental conditions. The fiber penetration through an orifice drilled on a plate was found to increase sharply with increasing wind velocity. It is believed that this work represents the first study that systematically measures the penetration of windborne long fibers into openings.