Speed of sound in a real gas?
Speed of sound in a real gas?
(OP)
Can one of you point me to a reference to determine the speed of sound in a real gas? A=sqrt(kRT) only works for real gases. I am *significantly* out of the real category in this particular problem. Thanks!
Thanks!
Pete





RE: Speed of sound in a real gas?
The NIST chemistry webbook gives speed of sound for many (pure) gases at varying P, T conditions.
RE: Speed of sound in a real gas?
RE: Speed of sound in a real gas?
Speed of sound depends on many parameters. You should use special software if this is a gas mixture and the value require high accuracy.
Best regards
Morten
RE: Speed of sound in a real gas?
if an equations of state and specific heat at a low pressure is available.
RE: Speed of sound in a real gas?
>For homogeneous gas mixtures the sound speed may be >calculated from sqrt dp/drho isentropic
>if an equations of state and specific heat at a low >pressure is available.
Being a dumb BSME, I can't handle differential elements too well, therefore sqrt (dP/drho) isn't too useful to me. I need something I can place into a spreadhseet. I have access to SRK and other EOS's via simulation software, e.g. HYSYS. Can you get me to the next step? Thanks!
Thanks!
Pete
RE: Speed of sound in a real gas?
v specific vol
p pressure
BUT dp/dv isentropic= gamma*dp/dv isothermal
where gamma = Cp/Cv
(sound speed/v)^2=-gamma*dp/dv isothermal
Given a pressure and temp (or v), an equation of state and gamma, the sound speed is readilly calculated.
If need be, gamma may be calculated if either Cp or Cv is known at low pressures.