Hip
Senior Member
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I just found some information about the depth of penetration of low frequency ultrasound waves. The image below indicates that ultrasound waves at 28 kHz penetrate about twice as far as 1 MHz ultrasound waves.
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i suspect the power levels used in your experiments so far are below those needed for significant cavitation to develop in tissues - but its necessary to do the groundwork to check for safety reasons
This article says loudspeaker efficiencies range from 0.5% to 20%. So let's assume 10% efficiency, that means my resonance loudspeaker is outputting about 2 watts of sound power.
Interesting experiment Hip. My kidneys are completely involved and i often wonder if they just could clear out these viruses and possible fungal or bacterial infections at times, that i would not be in the predicament i am. I keep working on strengthening my kidneys and working to decrease the viral load in them. I feel i was making some progress pre getting COVID in July. Its quite a slow process for me that if i speed up too much, i end up in severe crashes.....and then i begin at all new permanent baselines that are even worse.
just wanted to flag the reasons i think the biofilm disruption theory has more legs / should perhaps not be discounted based on the above calc
also adding more mass ( eg the metal plate you mention) will tend to move the resonant frequency lower
Only if the mass is directly attached to the driven part (coil, piezoelectric element, etc). I think the units Hip showed pictures of would have an interface of some sort between the driven surface and the exterior surface. For a typical audio speaker, gluing a mass to the cone would reduce the resonant frequency, but adding a plate to the speaker enclosure wouldn't.
Egg cavitation test - at the full 20W of the transducer (so around 2/5 amp volume) and nothing happened at all to the egg, it was more damaged in the movement around the house with the water sloshing a bit than it was with the transducer pumping energy into the water and bowl. We are not pumping sufficient energy to damage this.
Todays dose did nothing, I didn't get a spike of headache afterwards.
i may have misunderstood what exactly Hip did with his setup - but the way i had interpreted it was that he had added a metal plate to the moving element of the speaker
I attached that to a glass lid using Blu Tack in order to increase the diameter, so that it covers the whole of the kidney.: