균일 미립화 응용을 위한 압전 초음파 진동자의 성능고찰

초록

This study presents the performance evaluation of an ultrasonic vibrator for uniform atomization that can be applicable to conformal coating control in the light-emitting diode manufacturing process or wall-wetting control in fuel injection of vehicle engines. To achieve this goal, an ultrasonic vibrator was devised utilizing piezoelectric actuators to have longitudinal motion. After analytically analyzing the standing waves of the proposed ultrasonic vibrator, the concentrator horn of the vibrator was designed, and its design parameters were finally determined by a modal analysis through the finite element method. The uniform atomization properties of the sprayed droplets from the vibrator were evaluated by a fluid dynamics analysis using ANSYS FLUENT. To evaluate the effectiveness, the designed vibrator was manufactured, and the generated sound pressure level was measured. Subsequently, uniform atomization performances were experimentally demonstrated using the vibrator to uniformly conformal coat a light-emitting diode.

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