Fog Droplet Size as a function of Ultrasound Frequency

[Moondog]

TL;DR

Water driplets (fog, mist) size can be manipulated using ultrasonic frequency such that higher frequencies create smaller diameter particles.

I need to know how to predict particle size of a water driplet produced by a given ultrasonic frequency? For example, an ultrasonic fogger will create ~5 micron water driplets at a frequency of 1.75 MHz. I do know that the higher the frequency the smaller the driplet diameter. How is this relationship described mathematically and what is the physics for how mechanical vibrations actually generate micron-sized particles?

 

[berkeman]

Summary:: Water driplets (fog, mist) size can be manipulated using ultrasonic frequency such that higher frequencies create smaller diameter particles.

For example, an ultrasonic fogger will create ~5 micron water driplets at a frequency of 1.75 MHz

Do you have any links to descriptions of such foggers?

 

[Moondog]

Berkman: House of hydro (https://thehouseofhydro.com/) See dropdown for "Store" tab. Thanks for any help... The FAQs state "House of Hydro ultrasonic water foggers use high output ceramic discs that vibrate 1.7mhz to silently create microscopic (<5 micron) water droplets."

 

[berkeman]

Berkman: House of hydro (https://thehouseofhydro.com/) See dropdown for "Store" tab. Thanks for any help... The FAQs state "House of Hydro ultrasonic water foggers use high output ceramic discs that vibrate 1.7mhz to silently create microscopic (<5 micron) water droplets."

Thanks. What are these used for? Room humidifiers mainly? Is that the application you have in mind?

 

[Moondog]

Berkman: I am working to show DoD (and FAA) how dry fogging our patented protocol antibacterial can decontaminate a biologically contaminated aircraft (including sporulating pathogens like anthrax) and return it to clearance standards within 24 yours. We will also expand the use of this protocol to decontaminate hospitality settings, cruise lines, public transportation, hospitals, etc. We've already done this with wet fogging, but dry fogging would be more efficient, effective, and safe for electronics.

 

[Tom.G]

Here are a few articles that may help:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6468117/
https://www.sciencedirect.com/science/article/abs/pii/S0041624X01000543

(above, and many others, found with:
http://www.google.com/search?hl=en&source=hp&biw=&bih=&q=ultrasonic+fog+droplet+size)

Hope it helps!
Tom

 

[Moondog]

Thanks Tom. Very interesting and a good starting place.