What is the relationship between particle size and acoustic radiation force?

[Radel]

Dear All,

Can someone give me an intuitive idea of the acoustic radiation force.

I have read from a paper that the acoustic radiation force generated by a standing acoustic wave is larger when the size of particle is smaller than the acoustic wavelength as compared to the case when size > wavelength. I did search in the internet, where there are complex equations to prove it. But could someone give me a physical understanding of this behavior?

Thanks in advance!

Regards,
Radel...

 

[jerromyjon]

I think the force is the same solely due to the energy of the wave, its effect on a smaller particle, and therefore the feedback as in medical means for imaging it's the collective resistance to the waves force that clusters larger than the wavelength rebound the waves, smaller obstacles would weakly compare to the larger force of a larger wave.

I think I have that right but wikipedia says it's fairly new technology:http://en.wikipedia.org/wiki/Elastography