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Abstract
A fin pump utilizing a forced vibration of a flexible sheet in the same way as a caudal fin motion was developed for a treatment of fetal hydrocephalus. This study conducted an experiment to investigate the performance characteristics of the fin pump. A link system was designed to generate a pitching motion of a silicon rubber sheet and to control a vibration frequency and an amplitude. The vibration modes were analyzed by visualization. The pressure rise of the fin pump was derived from the flexible sheet deformation equation. The relative pressure coefficients for all experimental results were distributed on a line. This implies that the relative pressure coefficient is determined by the frequency ratio. The pressure rise was almost constant when the flexible sheet vibrated in the standing modes. On the other hands, the pressure rise increased with an increase of the frequency ratio when the flexible sheet vibrated in the travelling modes. This means that the pressure rise of the fin pump is closely related with the vibration modes determined by the frequency ratio. The pressure performance curve, the flow rate versus the pressure rise, was obtained by controlling a booster pump and a valve. At lower flow rates, the performance characteristics were similar to the results at the zero flow rate.
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