Many thanks to Jeya & starrwoode for the answers.. how about the one using ultrasonic sound to transform water into fine particles? I hope someone has heard about it & can explain this process.. One guy in australia is using it to deliver water & plant nutrients to the root system & claimed that the result is better that the current aeroponic system using pressure pump & fine nozzle, as he gets finer droplets & the system is more energy efficient.
2006-08-01 17:12:22 · 4 answers · asked by Omar Fadhlan 1 in Science & Mathematics ➔ Other - Science
very fine vibrations break the water into very very tiny droplets
2006-08-01 17:25:08 · answer #1 · answered by steve d 1 · 1⤊ 0⤋
While the best most spray misters produce droplets that are 50microns or larger (that's the width of a human hair), ultrsonic nebulizers can produce droplets which are a few microns in diameter. That is why ultrasonic fogs float around and don't descend rapidly. How does it do this? Ultrasound means that the frequency of oscillation can be from 250 kHz to 2000 kHz. This rapid oscillation can break droplets into a very fine mist as sound "pushes and pulls" water apart. Ultrasonic mist can be used for aquaculture. But spray mist can work nicely also. With ultrasonic mist as with any misting method bacteria can grow can grow in your media. Ultrasound tends to tear and break up bacteria whereas as most sprays just leave them intact.
2006-08-01 17:46:22 · answer #2 · answered by Kitiany 5 · 0⤊ 0⤋
Ultrasonic nebulizers or sonicators are "just" speakers (ceramic) that broadcast soundwaves with frequencies higher than human hearing, The waves of sound are powerful enough to break apart bulk water into small droplets, theoretically down to diameters about the size of the wavelengths of sound. They shouldn't be confused with diagnostic ultrasound which has both different frequencies and power (wattage).
The ultrasound can also speed up dissolution of solutes and produce finer emulsions of insoluble materials. With appropriate power and focussing, it can also decompose organic compounds in the water (the equivalent of 5000 K (sun's temperature)) while the bulk temperature remains at near room temperature.
I don't know about the "guy in Australia". He's using the right catch phrases, but without a journal reference, I'd have to believe he's at best a sincere amateur and at worse, somebody out to sell nebulizers (they've been in use for decades as humidifers and for asthma treatments).
2006-08-01 17:32:04 · answer #3 · answered by ChemDoc 3 · 0⤊ 0⤋
It can? I didn't know that. I don't even know what that is.
I never learned that in school. âº
2006-08-01 17:19:34 · answer #4 · answered by xinnybuxlrie 5 · 0⤊ 0⤋