A mathematical definition of choking phenomenon and a mathematical model for predicting choking velocity and choking voidage

Yang, Wen‐Ching

doi:10.1002/aic.690210526

Cited by 72 publications

(36 citation statements)

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“…Among the different types of methods developed, the form of Yang's formula [16,17] looks the one most reasonable, as the formula was derived from two simple theoretical deductions. The first one is used to calculate the terminal velocity u 0 t for uniformly suspended particles with voidage ε in a riser of diameter D t , in relative with the original value u t for a single particle…”

Section: Modeling Strategies Learned From Bubbling Bedsmentioning

confidence: 99%

“…The second deduction is that the terminal velocity of a particle suspension in a finite diameter riser u 0 t , that is, the slip velocity between gas and solid, is just equal to the terminal velocity of a single particle in the infinity u t, when type A choking occurs [16,17] …”

Section: Modeling Strategies Learned From Bubbling Bedsmentioning

confidence: 99%

“…The original value of solid-wall friction factor f p was taken as 0.01 in 1975 [16], but it was changed in 1983 to the present form as [17] f will always be unity. With a decrease of D t , the wall friction increases, then u t ' increases.…”

Section: Modeling Strategies Learned From Bubbling Bedsmentioning

confidence: 99%

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Introductory Review on an Engineering Approach for Fast‐Bed Modeling in Mimic to Bubbling Bed Practice

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Based on the downward-penetrating particle flow through clusters and the analogy between a falling cluster and a rising bubble identified by the authors, a "type-Achoking-oriented separate-phase-coexistence model" for the upper dilute region of fast beds was established first. Without any model parameter adjustment, the unified model predicted successfully the type C choking, the solids holdup of upper dilute region, and transitions to the high-density fast bed and the dense suspension up-flow.The model was then integrated with the sub-models of "cluster rebound at the dense bottom,"" the momentum flux balances for acceleration and transition zones" in the lower and middle parts of the bed. The integrated model predicted successfully the axial solids holdup distributions of literature data under extremely wide operation conditions covering dilute-phase transportation, the premature fast bed, the classical fast bed, and the high-density fast bed.

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Section: Modeling Strategies Learned From Bubbling Bedsmentioning

confidence: 99%

Section: Modeling Strategies Learned From Bubbling Bedsmentioning

confidence: 99%