A light transmission technique has been developed for measurement of the local porosity in two-dimensional gas-fluidized beds. The principles of liquid-solid fluidization and vibrofluidization were employed to perform the necessary calibration. Time-averaged porosity profiles have been measured in a thin two-dimensional gas-fluidized bed with a central rectangular jet. These profiles were predicted satisfactorily with a previously developed first principles hydrodynamic model, without the use of any fitted parameters. The hydrodynamic model is based on a two-fluid model approach in which both phases are considered to be continuous and fully interpenetrating.
Kuipers, J. A. M., Tammes, H., Prins, W., & van Swaaij, W. P. M. (1992). Experimental and theoretical porosity profiles in a two-dimensional gas-fluidized bed with a central jet. Powder Technology, 71(1), 87-99. https://doi.org/10.1016/0032-5910(92)88008-6