An analysis of moving-bed flow of solids down standpipes and side valves

Critical Bed Height for Solid Circulation in a Compartmented Gas-Fluidized Bed

“…The bed porosity and pressure drop for the dense phase are obtained from Eqs. (18), (19) and (20). In Eq.…”

“…Under these conditions, Eqs. (18), (19) and (20) can be used to get the experimental values of f 2 which are correlated, as given by Eqs. (27) and (30) for the riser and Vvalve, respectively.…”

“…In a standpipe, the resisting force for the flow of solids in a packed bed can be expressed as a function of the slip velocity, as given by Eq. (41) [20].…”

“…This produces a higher equilibrium dense phase height, h D , and hence larger DP D (see Eq. (20)) in the case of smaller-sized particles for the same solid circulation rates. Again, in the lean phase regime, for similar aeration (U/U mf ) and solid circulation rate, the acceleration pressure drop is generally large for smaller particle sizes on account of higher solid velocities (see Eq.…”

Modeling heterogeneous downward dense gas‐particle flows

“…Over the years, several models have been proposed to predict the pressure along the vertical flow,2–7 all essentially stating that the flow is homogeneously fluidized between the minimum fluidizing and bubbling states. The pressure is then estimated using the mathematical expression of the static pressure head and an estimation of the apparent density of the suspension.…”