Particle Discharge Characteristics from the Nozzle of a Thin Tube Immersed in Liquid Subjected to Ultrasonic Wave Force [Translated]^†

Abstract

A wet micro-feeder that utilizes ultrasonic wave force was designed and constructed to feed small particles into a container of wet particulate materials.

Microfeeding with different ultrasonic nozzle designs

“…After that, Li et al [6] used 49 kHz ultrasonic vibration in the longitudinal direction to vibrate a capillary tube, and obtained a flow rate as low as 10 lg/s. Yamamoto et al [7] studied particle discharge characteristics from the nozzle of a thin tube immersed in liquid subjected to ultrasonic vibration. Yang et al [1] built a simple device from an ultrasonic generator and a glass capillary, which, rather than delivering a continuous metered stream of powder can jet individual samples of mass down to 50 lg.…”

“…Thus Yamamoto et al [7] used two Langevintype ultrasonic transducers fixed to the outside of the base of a rectangular, stainless steel, water vessel. (2) The piezoelectric ring is set into the nozzle tube, generating a progressive wave.…”

Studies on ultrasonic microfeeding of fine powders

“…Yang and Evans [23] built a simple device from an ultrasonic generator and a glass capillary tube, which can jet individual samples of dry powder of mass down to 50 µg. Yamamoto et al [24] studied the particle discharge characteristics from the nozzle of a thin tube immersed in liquid subjected to an ultrasonic wave. They achieved stable and continuous discharge of small amounts of powder and found that the critical ratio of inside diameter of nozzle tip to particle diameter for particle blockage of the feeder was smaller than the values obtained previously for dry powder falling in the gravitational field.…”