×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Heat capacity at constant volume
2

Heat capacity at constant volume

Heat capacity at constant volume

(OP)
To design any flowmeter, both heat capacity i.e. at constant pressure and at constant volume is required.

Heat capacity at constant pressure is available at various books. But it is not available at contant volume.

I guess there is a relation between them. Request to help if there is any relation and what is that

RE: Heat capacity at constant volume

What's the medium and at what temperature? This varies depending on the medium. Cp is generally higher than Cv by an approximate range of 1.2 to 1.5. For air at room temperature, the k factor (which is Cp divided by Cv) is 1.4.

Specific heat at constant pressure (Cp) is the energy required to raise a unit of mass of a substance one degree while holding the pressure constant.

Specific heat at constant volume (Cv) is the energy required to raise a unit of mass of a substance one degree while holding the volume constant. For gases, this takes 30% less energy (give or take, depending on the substance) than doing the same at constant pressure.

RE: Heat capacity at constant volume

TS!

Cp/Cv = expansion coefficient and Cp-Cv = universal gas constant.

Regards,

Note: Cp and Cv are specific heats.

Truth: Even the hardest of the problems will have atleast one simple solution. Mine may not be one.

RE: Heat capacity at constant volume

TS,

k=Cp/Cv is not generally correct for real gases. It is an ideal gas law convention.  Your best bet for developing Cp's and Cv's for real gases is to use an equation of state.  In the natural gas ompressor business BWRS and Lee-Kessler are the most popular EoS's.

Regards,

Gunnar

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources