Cannot find the Temperature Change inside of a Tank

Click For Summary
SUMMARY

The discussion centers on calculating the internal temperature change in a pressurized tank containing a real gas, specifically using the Van der Waals equation of state. The initial conditions are set at 4000 psi and 100°F, with additional gas entering at 34°F. Participants explore the complexities of energy transfer, mixing dynamics, and the application of the open-system version of the first law of thermodynamics. Key insights include the need for differential equations to model energy changes and the distinction between internal energy and enthalpy.

PREREQUISITES
  • Understanding of the Van der Waals equation of state
  • Familiarity with the first law of thermodynamics in open systems
  • Knowledge of differential equations related to energy transfer
  • Basic concepts of internal energy and enthalpy
NEXT STEPS
  • Study the open-system version of the first law of thermodynamics
  • Learn about the Van der Waals equation and its implications for real gases
  • Research numerical methods for solving differential equations in thermodynamics
  • Explore computational fluid dynamics (CFD) for modeling gas mixing in tanks
USEFUL FOR

Engineers, thermodynamics students, and researchers involved in gas dynamics, energy transfer analysis, and thermodynamic system modeling will benefit from this discussion.

  • #91
Are you confident that you are getting the correct answer now? If so, I think were done here, right?
 
Science news on Phys.org
  • #92
Yes! I notice that I get some elevated values from yours, but from my experience in programming, and the fact that I approached a part of the code slightly different than yours, that there is just a final little "something" I need to nail down. But I am confident that I will have this solved on my own very shortly.

So, sir...I want to thank you for your tremendous help on all of this. Thermo is one of my weak points, and I have a good grasp now on a portion of it. I had hoped that I would not have had to stretch this out so long, but my work schedule has been really tight these last months. Thanks for hanging in there with me!
 
  • #93
...and a little update. I found the cause of the disparity between your results and mine this afternoon. I had used the wrong coefficient in C_v = c * R. I had it set to the diatomic value of 2.5, and have changed it to 3.3. Now our results are identical to many decimal places.
 
  • Like
Likes   Reactions: Chestermiller

Similar threads

  • · Replies 109 ·
4
Replies
109
Views
8K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 3 ·
Replies
3
Views
1K
  • · Replies 28 ·
Replies
28
Views
3K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 69 ·
3
Replies
69
Views
7K
  • · Replies 15 ·
Replies
15
Views
3K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 4 ·
Replies
4
Views
2K