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Excessive mass loss resulting from reaction
Posted Jan 16, 2024, 2:00 p.m. EST Fluid & Heat, Porous Media Flow, Chemical Reaction Engineering 0 Replies
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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,
Hello Ali Mohammadtabar
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