In circulating fluidized bed reactors, particle velocities should exceed the transport velocity to ensure circulation of solids in the system. According to Zhang et al., the transport velocity can be calculated from the following equation
where the Archimedes number is defined as
utr(dp, mu, rhog, rhos)¶
Determine the transport velocity of particles in a circulating fluidized bed riser. Based on Equation 2 in article by Zhang et al. 1.
dp (float) – Diameter of particle [m]
mu (float) – Viscosity of gas [kg/(m s)]
rhog (float) – Density of gas [kg/m^3]
rhos (float) – Density of solid particle [kg/m^3]
utr (float) – Transport velocity [m/s]
>>> utr(0.0005, 3.6e-5, 0.44, 1630) 26.0617
H.L. Zhang, J. Degreve, R. Dewil, and J. Baeyens. Operation diagram of Circulating Fluidized Beds (CFBs). Procedia Engineering, 102, pp. 1092-1103, 2015.