Ultrasonic nozzle | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-06

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Ultrasonic_nozzle


00:00:50 1 History
00:01:34 2 Applications
00:02:09 2.1 Drug eluting stents and drug eluting balloons
00:02:53 2.2 Fuel cells
00:04:36 2.3 Transparent conductive films
00:05:56 2.4 Carbon nanotubes
00:06:21 2.5 Photoresist spray onto mems wafers
00:07:47 2.6 Printed circuit boards
00:08:35 2.7 Solar cells
00:09:29 2.8 Ultrasonic spray pyrolysis



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SUMMARY
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Ultrasonic nozzles are a type of spray nozzle that uses high frequency vibration produced by piezoelectric transducers acting upon the nozzle tip that will create capillary waves in a liquid film.  Once the amplitude of the capillary waves reaches a critical height (due to the power level supplied by the generator), they become too tall to support themselves and tiny droplets fall off the tip of each wave resulting in atomization.The primary factors influencing the initial droplet size produced are frequency of vibration, surface tension, and viscosity of the liquid. Frequencies are commonly in the range of 20–180 kHz, beyond the range of human hearing, where the highest frequencies produce the smallest drop size.