Re: Shock wave refection

From: Franz Heymann (notfranz.heymann_at_btopenworld.com)
Date: 06/20/04 

Date: Sun, 20 Jun 2004 05:18:25 +0000 (UTC)

"heiko ackermann" <heiack@gmx.de> wrote in message
news:cb22rf$n4v$04$1@news.t-online.com...
> Hi,
> I've a question about the reflection of a shock wave.
> First I've a spherical shock wave which is in water. The acoustic
> impedance of water is about 1,5 Million then the shock wave hits an
> spherical bubble with a acoustic impedance of 0,375 million. If i
can
> use the classical caculation for reflection, transmisson etc. I know
how
> I can caculate the intensities. But there is a problem, the bubble
has
> nearly a diameter of 0,5 mikrometers, and the wavelength of the
shock
> wave is much greater. So I'am not sure if can use the classical
> caculations, because I know if an object is much smaller than the
wave
> length of a wave, the wave is not recoignizign the object, this
means in
> my special case that the shock wave will completly tranmitted.

In your case, the shock wave will go almost clean through the bubble,
with only a minor amount of diffraction.

Incidentally, are you sure that concepts like acoustic impedance apply
to shock waves? Surely they are only valid in the linear region of
pressures and amplitudes?

Franz
>
> Heiko

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