Flow regime diagrams for gas-solid fluidization and upward transport

Overview of Chemical-Looping Reduction in Fixed Bed and Fluidized Bed Reactors Focused on Oxygen Carrier Utilization and Reactor Efficiency

“…According to the Yagi and Muchi correlation, slugging is unlikely to occur for this unit ( (Rhodes, 2008). (Bi and Grace, 1995) and validity of the bubbling bed regime hypothesis for the data published by Chandel et al (2009).…”

“…The analysis is based on the work of Bi and Grace (1995) updated to account for the newer and more general correlation of Haider and Levenspiel (1989) for the particle terminal velocity, U t * , and the recent correlation of Olazar et al (2009) for the minimum spouting velocity, U ms * , in conical spouted beds at high temperatures. The shaded areas in Fig.…”

Grid independence behaviour of fluidized bed reactor simulations using the Two Fluid Model: Effect of particle size

“…This was done according to the classic flow regime diagrams of Bi & Grace [23] by always taking the fluidization velocity that would lie in the middle of the bubbling fluidization regime, bisecting the boundaries posed by the minimum fluidization velocity and the critical velocity where turbulent fluidization commences. These boundaries are calculated as follows [23 using the Reynolds number As can be seen from Figure 1, the fluidization velocity (nondimensionalized as the Reynolds number) is linked to the particle size (nondimensionalized as the Archimedes number)…”

Circulating fluidized bed hydrodynamics experiments for the multiphase fluid dynamics research consortium (MFDRC).

“…The overall solids mass flux was determined using the time of flight method described in Bhusarapu et al (2004 ab). Operating flow regimes were identified from the idealized flow regime map of Bi and Grace (1995). …”

“…The flow condition at Ug riser = 5.5 m/s and G s = 102 kg/m 2 ·s, exhibits a slightly different functional form near the center of the column (Figure 4.44a). This deviation is probably due to the flow being close to the regime transition (based on the flow regime map of Bi and Grace, 1995), resulting in the oscillating flow of the suspension, moving in slugs. The mean axial velocity, as seen in Figure 4.44b, increases with the increase in solids mass flux at constant gas velocity, which agrees with most of the reported studies (e.g., Berruti et al, 1995).…”