Study on liquid-phase axial dispersion in converging taper liquid-solid fluidized beds

It is found analytically that the parabolic radial profile of liquid veloci ty in cylindrical liquid-solid fluidized bed (LSFB) causes particles to cir culate around some radial position. This is the main reason for liquid-phas e axial dispersions. The liquid-phase axial dispersion is depressed as the liquid velocity presents a flatter Bessel radial profile in a converging ta per LSFB. The void fraction increases with axial distance in converging tap er LSFB. The behavior produces less liquid-phase axial dispersion. Experime ntal results show good coincidence.