Need help for ultrasonitc atomizer (transducer)

[MRoydev]

I am trying to prototype ultrasonic transducer, but it is little difficult. I did't found a lot of articles about it, the hard work is how to calc the the dimensions of the horn and the back mass, we are working at 50 kHz frequency. I have generator with regulator for the frequency we havo some prototypes which have worked from AL2017 now I am trying to make it from SS417/420. I have another problem with the temperture after 30 sec of work it is more then 50 C deg. It is working at half sound lenght, from what I saw there are different design, half sound lenght , one and two. If some need more information i will share and for is little difficult to understand the physics behind it.
Thanks for the heml

 

[Baluncore]

Welcome to PF.

... the hard work is how to calc the the dimensions of ... the back mass, we are working at 50 kHz frequency.

It is not the back-mass in kg that is important, it is the length in millimetres of the back-mass that must be dimensioned, to reflect the wave with the correct phase delay. That requires knowing the speed of sound in the back-mass material.

How do you arrange a horn to atomise, a liquid?
I would expect an exponential taper to a smaller section.

 

[MRoydev]

Hi Baluncore,
Thank you for the great welcome. I am currently trying with this scheme, from my calculation the lenght of the wave is 101.92 mm long and we are currently using half wave lenght and the horn is 25.48 mm, but the back is shorter. We have one chines trasducer like this one on the picture which have back mass with lenght only 10 mm.