The fluidization in the furnace of circulating fluidized bed (CFB) boilers is described. Data have been obtained from a 12 MWth CFB boiler and literature. bottom bubbling rather than fast or turbulently as often assumed. There an extended splash zone above this bed, which particles are thrown up by bubbles fall back onto bed. Other carried further into transport zone, initially saturated gas fl...

Particle image velocimetry and a 3D hard sphere discrete particle model were applied to determine particle velocity profiles in the plane around a spout in a spoutfluid bed for various initial bed heights, spout and background fluidization velocities. Comparison between experimental and numerical results revealed that the particle velocities are underestimated by particle image velocimetry, whi...

The transport of 2D powder mixtures is investigated using a model recently proposed by us to describe the fluidization of granular media. We simulate the behaviour of particles placed on a belt having vertical as well as horizontal vibrations. Using Molecular Dynamics we calculate the density field and velocity distributions of the particles and investigate the angular dependence of momentum tr...

NMR technique of modulated gradient spin echo makes possible to measure the power spectra of displacement and velocity autocorrelation functions of the air-fluidized granular beds. The obtained frequency distribution of displacement and velocity spectra at different degrees of fluidization leads to an empiric formula that well-fits to the experimental data and gives negative long-range tail of ...