Orientation of Fibers in Liquid by Ultrasonic Standing Waves

概要

論文の詳細を見る
The orientation of fibers in a liquid irradiated with ultrasound is studied to realize the noncontact directional control of reinforcing fibers in the molten matrix of a composite material. The equations of translational and rotational motions of a fiber in a standing wave field are derived. The numerical solutions show the movement of the fibers at various initial positions and their stable positions and directions. Experiments are performed using polystyren fibers of various lengths suspended in an aqueous sugar solution. Both numerical and experimental results indicate that polystyrene fibers shorter than one-fourth of the wavelength are constrained at the pressure node and are oriented in the direction perpendicular to that of wave propagation. On the other hand, fibers ranging from one-fourth to one-half of the wavelength have orientaiton either parallel to the direction of wave propagation at the pressure loop or perpendicular to that at the pressure node depending on their initial positions and derections.
社団法人応用物理学会の論文
2000-06-15