Hydrodynamic studies of a Annular Circulating Fluidised Bed Drier with sand particles

The hydrodynamics of Annular Circulating Fluidised Bed Drier (ACFBD) has be en studied with sand particles of diameter 928 mum and density 2550 kg/m(3) . The gap opening was varied from 12 to 48 mm and the mass flux of solids w as found to be constant for the gap openings greater than 44 mm. Two regime s, slugging dense flow and dilute phase flow were identified and models wer e proposed for pressure drop calculation for the two regimes. An erratic fa ctor has been introduced for the slugging dense dow regime. The models agre ed with the experimental data with an error of less than 20%.