Characterisation of the particle-wall frictional forces in pseudo-2D fluidized beds using DEM Articles uri icon

publication date

  • September 2014

start page

  • 136

end page

  • 143

volume

  • 116

international standard serial number (ISSN)

  • 0009-2509

electronic international standard serial number (EISSN)

  • 1873-4405

abstract

  • In this work a numerical study of a pseudo-2D gas fluidized bed is carried out using the MFIX-DEM code with a twofold aim. The first aim is to check whether the DEM code reproduces the overall experimental value of the frictional force of the walls on the particles in the pseudo-2D bed in bubbling regime, previously measured by Hernandez-Jimenez et al. (2013) by means of a global force balance in the bed. The second aim of this work is to perform a local study of the wall-particle frictional forces, using the results of the DEM simulations. The results showed that the force balance proposed by Hernandez-Jimenez et al. (2013) is consistent with the DEM simulations, corroborating that the particle-wall overall force can be considered equal to the velocity of the centre of mass times a global particle-wall interaction coefficient, c. Besides, it was found that the most probable value of the local coefficient c in the DEM simulations is similar to the global value experimentally obtained. As expected, the DEM results showed that this particle-wall interaction coefficient, c, increases with the particle-wall friction coefficient. Coincidence between simulations and experiments is maximum if an angle of internal friction very close to 30 degrees is considered in the DEM particle-wall interaction.

keywords

  • fluidized bed; pseudo-2d; wall friction; force balance; dem