Discussion Forum

Forum Home

New Discussion

Note: This discussion is about an older version of the COMSOL Multiphysics^® software. The information provided may be out of date.

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

Units problem

Posted 2011年10月27日 GMT-4 11:43 Chemical Reaction Engineering Version 4.2 2 Replies

Peter Hou

Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hello,
I am trying to set up a model about endothermic reaction in a tube reactor. Hydrogen is produced in the process of reaction. When I used -k*c_A*deltaH to express heating source, the program regarded the unit was wrong. Also, when I used 3*k*c_A to express the production of hydrogen, the progran again regarded the unit was wrong. Can anybody explain why?
Thank you very much.

2 Replies Last Post 2011年10月27日 GMT-4 14:00

Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago

Hi

I suppose it all depends what are the units of your variables and where you used them. I believe you should dump an image at least with some more details to give us a better clue. many fields in COMSOL are "per element dx*dy*dz) hence the demand for density units

--
Good luck
Ivar

Peter Hou

Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago

Hi Ivar,
Thank you for the quick response. I have solved the problem.
Best regards,
Xuxian

Note that while COMSOL employees may participate in the discussion forum, COMSOL^® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Discussion Forum

Units problem

Suggested Content