Hi everyone,
I am currently doing some research with MFiX and I am interested on comparing the performance of both TFM and DEM in terms of chemical reactions.
I have implemented the partial char oxidation in a usr_rates.f file as proposed in the MFiX documentation using a TFM model.
https://mfix.netl.doe.gov/doc/mfix/19.1.3/model_setup/reactions/examples/char-udf.html
The reaction rate units have to be kmol/(m^3 s).
I would like to implement the same reaction mentioned using a DEM model. To do this, I have to use the usr_rates_des.f file and the rate of the reaction has to be expressed in kmol/s.
Which is the volume that has to be used in order to transform the rate units from kmol/(m^3 s) to kmol/s? I assume its the volume of the particles in each cell but, what about 2D simulations? Do I have to use the volume of the sphere or its projection on the simulated plane?
Thanks in advaced
Miguel