How to / DIY > Everything else
Ultrasonics
snowman18:
The Effect of Ultrasonic Waves on Oil Viscosity
This study presents the development of a technique to directly investigate the effect of ultrasonic waves at 25 and 68 kHz and 100, 250, and 500 W on the viscosity of paraffin, synthetic oil, and kerosene.
Experiments were performed under both controlled and uncontrolled temperature conditions in a smooth capillary tube.
The results indicate that the viscosity of the liquids decreases upon exposure to ultrasound and may be attributed to induced heat generation and cavitation within the fluid.
The specifics of ultrasound frequency, power, and temperature on viscosity reduction are discussed and interpreted.
snowman18:
--- Quote from: mike90045 on December 12, 2019, 07:11:58 AM ---Mhz frequencies are radio waves. There is no "transducer" unless it's a channel crystal in a holder or a SAW filter
Khz frequencies are closer to Audio, with 20hz - 20Khz being typical Hi-Fi gear, 25Khz generally being the lower end of the ultrasonic range, and a couple Mhz being the upper end. AM radio roughly covers 0.5Mhz to 2Mhz, above 2Mhz, you are in shortwave radio.
--- End quote ---
Ultrasonic transducers with an output in from 28/100 khz range are low frequency, mhz are classified as ultra high frequency upwards to the ghz range.
Ultrasonic transducers produce acoustic sound waves via cavitation, bats use echolocation to navigate.
Burning Water With Radio Waves.
In this video the experimenter is using radio waves to break water down into hydrogen and oxygen to produce fuel.
https://youtu.be/e8utkoK2DhA
https://dnr.maryland.gov/wildlife/Pages/plants_wildlife/bats/batelocu.aspx
About 70% of all bat species worldwide have this ability. Also, bats aren't the only animals that use echolocation. Whales, dolphins, porpoises, oilbirds and several species of shrews, tenrecs, and swiftlets use a similar technique.
Most bat echolocation occurs beyond the range of human hearing. Humans can hear from 20 Hz to 15-20 kHz depending on age. Bat calls can range from 9 kHz to to 200 kHz.
cobbadog:
Found what I was looking for but it is a very vague diagram as far as I can tell. All the other info on the sheets are small pics of certain parts up close and how to test them. Hope this helps you.
Navigation
[0] Message Index
[*] Previous page
Go to full version