@article{gómez_milioli_2004,  title={A numerical simulation analysis of the effect of the interface drag function on cluster evolution in a CFB riser gas-solid flow},  volume={21},  ISSN={0104-6632},  url={https://doi.org/10.1590/S0104-66322004000400006},  DOI={10.1590/S0104-66322004000400006},  number={4},  journal={Brazilian Journal of Chemical Engineering},  publisher={Brazilian Society of Chemical Engineering},  author={Gómez, L. C. and Milioli, F. E.},  year={2004},  month={Oct},  pages={569–583} }