A modified wake model in bubble-induced three-phase inverse fluidized bed (BIFB)

Ma, Keying; Sun, Xiliang; Shao, Yuanyuan; Zhu, Jesse

doi:10.1016/j.partic.2021.07.007

Cited by 3 publications

(3 citation statements)

References 16 publications

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“…As has been discussed in our earlier reports, 1,3 the bubble‐induced inverse three‐phase fluidization goes through four fluidization regimes including fixed bed regime, transition regime, complete fluidization regime, and entrainment regime with increasing gas velocity. As shown in Figure 3, with the gas flow as the only driving force, the flow behavior of the gas bubbles would significantly affect the flow regime and particle distribution.…”

Section: Resultsmentioning

confidence: 58%

“…Their findings indicated that the critical fluidization velocity of hydrophobic polyethylene particles is lower than that of hydrophilic polyethylene particles. Our previous preliminary studies, [1][2][3] focused on the basic hydrodynamic characteristics such as flow regimes, transition velocities between neighboring flow regimes, fluidization ratio, average phase holdups, and local phase holdup distributions. Furthermore, we modified a gas-induced wake model in the BIFB.…”

Section: Also Examined the Critical Fluidization Velocitymentioning

confidence: 99%

“…Bubble-induced three-phase inverse fluidized bed (BIFB) is a newly developed fluidized bed reactor where light particles with a lower density than the liquid are fluidized by the upward gas flow only without a net liquid flow. [1][2][3][4] Compared with the regular "liquid-driven" liquid-solid or gas-liquid-solid inverse fluidized beds, the BIFB has many advantages such as lower gas fluidization velocity and no net liquid flow required, reducing energy requirements. In addition, the bed particles can easily expand to the whole bed to obtain a uniform axial particle distribution in BIFB.…”

Section: Introductionmentioning

confidence: 99%

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The bubble size and rise velocity of bubble‐induced three‐phase inverse fluidized bed (BIFB)

Ma,

Sun,

Shao

et al. 2023

AIChE Journal

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The bubble size and rise velocity were investigated in detail using a new telecentric photographic probe in a pilot‐scale bubble‐induced three‐phase inverse fluidized bed (BIFB). By the influence of the bubble flow behavior, the particle bed goes through four different flow regimes with increasing gas velocity in BIFB. An obvious normal bubble size distribution caused by bubble coalescence and breakup was observed. A parameter of “size span” was proposed to describe the distribution width of bubble size. The average bubble size increases with the axial distance from the column bottom and with the gas velocity until reaching a relatively stable size. The radial distributions of the average bubble size are almost uniform but experience a decreasing trend near the column wall. The bubble rise velocity increases with the bubble size and the gas velocity. An empirical equation was established to predict successfully the bubble rise velocity in BIFB.

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Section: Resultsmentioning

confidence: 58%

Section: Also Examined the Critical Fluidization Velocitymentioning

confidence: 99%