CFD Online Logo CFD Online URL
Home > Forums > NUMECA

Kinetic Theory

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   June 24, 2003, 12:04
Default Kinetic Theory
Posts: n/a

In the ideal gas model using the kinetic theory for Cp and K, which are the values to insert in degrees of freedom...........

thanks in advance payment
  Reply With Quote

Old   July 25, 2003, 15:53
Default Re: Kinetic Theory
Posts: n/a

the number of translational and rotational modes are added up. For monatomic gasses this is 3 for diatomic this is 5 ie 3 translations and 2 rotations.

Cv=DOF/2*R/M Cp=(DOF+2)/2*R/M

R=universal Gas Constant 8.314[kJ/kg/K] M=mollecular Weight [kg/kmol]

So let us try this for Argon, DOF=3, M=39.94[kg/kmol]

Plug it in and get 0.527[kJ/kg/K]

compare to Reynold's and Perkins, "Engineering Thermodynamics" talbe B-6b 0.523[kJ/kg/K]

Similarly k=Cp/Cv=3/5=1.67

Try it out for nitrogen and oxygen and you will get pretty good comparison as well, ie k=1.4! So as a first approximation it works quite well for monatomic and diatomic gasses.


  Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
CP - KINETIC THEORY Leo FLUENT 0 October 15, 2007 10:40
Kinetic Theory Tommaso FLUENT 2 July 2, 2003 05:21
Kinetic Theory Tommaso Main CFD Forum 1 June 30, 2003 10:06
kinetic theory in Fluent Tschumperle Denis FLUENT 0 October 17, 2000 09:48
solid kinetic theory wan xiaotao Main CFD Forum 6 August 10, 1999 18:43

All times are GMT -4. The time now is 18:57.