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Isentropic exponent and specific heat ratio
3

Isentropic exponent and specific heat ratio

Isentropic exponent and specific heat ratio

(OP)
Hi all,
That's a small question but really make me confused in the control valve calculation.
Could "isentropic exponent" be treated same as "specific heat ratio" in control vavle calculation?

Thanks

RE: Isentropic exponent and specific heat ratio

fifaln:

I suspect that you are talking about the "isentropic expansion factor" which is a synonym for "specific heat ratio" ... in other words, they are the same thing.

You might be interested in reading this article in the online Citizendium encyclopedia:
http://en.citizendium.org/wiki/Specific_heat_ratio

 

Milton Beychok
(Visit me at www.air-dispersion.com)
.

 

RE: Isentropic exponent and specific heat ratio

(OP)
mbeychok:

Thank you for your reply. Now, I got the idea that for the ideal gas, they are same thing,right?

RE: Isentropic exponent and specific heat ratio

This basic thermo stuff can be found in SVNA or Kyle, whichever one you used for undergrad.

RE: Isentropic exponent and specific heat ratio

fifaln (Electrical) Yes,right,  for the ideal gas, they are the same thing.

RE: Isentropic exponent and specific heat ratio

sailoday28:

Quote:


mbeychok (Chemical) 23 Mar 09 14:31  
fifaln:

I suspect that you are talking about the "isentropic expansion factor" which is a synonym for "specific heat ratio" ... in other words, they are the same thing.
Thanks for agreeing with me, that is very kind of you.
 

Milton Beychok
(Visit me at www.air-dispersion.com)
.

 

RE: Isentropic exponent and specific heat ratio

that is for an ideal but not a perfect gas, in other words idealized non-ideality...

RE: Isentropic exponent and specific heat ratio

hacksaw (Mechanical)Both ideal and perfect gas have an equation of state   pv=RT.   For this equation of state, specific heat ratio, and isentropic expansion factor are equivalent.
 Note that for pv=RT, the difference of specific heats is easily shown to be, Cp - Cv =R  
 

RE: Isentropic exponent and specific heat ratio

perfect, or is it an ideal respomnse, i think i'll go sailing...

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