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.

Excessive mass loss resulting from reaction

Please login with a confirmed email address before reporting spam

Hello,

An axisymmetric model was developed to study the methane decomposition of a tabular reactor. In this model, the governing equations including continuity, Navier Stokes, heat transfer and transport of concentrated species were solved. In order to find the mass lost in the reactor, a mass source was added to continuity equation, -r M_CH4+2r M_H2, where r is the reaction rate in [mol/m3.s], M_CH4 and M_H2 are the molar mass of methane and hydrogen, respectively. The solver converged and we could find the methane and hydrogen mass fraction inside the reactor. Then, we looked at the inlet and outlet mass flowrate to see how much mass lost inside the reactor. The results showed we are loosing much more mass compared to theoretical. In theory, the maximum mass lost (at %100 conversion) must be %75 because we are removing 1 mole of CH4 and adding 2 mole of H2. Any insights or suggestions to address this anomaly would be greatly appreciated.

Thank you,


0 Replies Last Post Jan 16, 2024, 2:00 p.m. EST
COMSOL Moderator

Hello Ali Mohammadtabar

Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.

If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

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.