Mechanism of slugging in gas-solid fluidized beds with large particles

Journal Article · Fri Jan 01 04:00:00 EST 1988 · Int. J. Eng. Fluid Mech.; (United States)

OSTI ID:5826749

Puncochar, M; Drahos, J; Cermak, J

Slugging is an effect encountered frequently in fluidization. Bubbles in fluidized bed grow larger as they rise through the bed and slugging occurs if the bubble size approaches bed diameter. Prediction of the onset of slugging is of great importance as the mass and heat transfer in slugging bed differ considerably from those in bubbling or turbulent regimes of fluidization. A new dynamic model describing the mechanism of slugging in gas-solid fluidized bed of large particles is proposed in this paper. The model is based on a simplified form of Newton's law of motion which is applied to the process of compression of a plug or solid particles. Three kinds of forces are considered: buoyant, gravity, and shear force between particles and wall. The onset of slugging is defined as a point at which upward (buoyant) and downward (gravity and shear) forces are in equilibrium and no additional compression of the plug is possible.

• Research Organization: Institute of Chemical Process Fundamentals, Czechoslovak Academy of Sciences, Prague (CS)
• OSTI ID: 5826749
• Journal Information: Int. J. Eng. Fluid Mech.; (United States), Journal Name: Int. J. Eng. Fluid Mech.; (United States) Vol. 1:2; ISSN IJEME
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
BUBBLES
DATA
DIFFERENTIAL EQUATIONS
DYNAMICS
ENERGY TRANSFER
EQUATIONS
EXPERIMENTAL DATA
FIELD THEORIES
FLOW MODELS
FLUID FLOW
FLUIDIZED BEDS
FLUIDS
GASES
HEAT TRANSFER
INFORMATION
ITERATIVE METHODS
MATHEMATICAL MODELS
MECHANICS
MOTION
NEWTON METHOD
NUMERICAL DATA
PARTICLE SIZE
PLUGGING
QUANTUM FIELD THEORY
QUANTUM GRAVITY
SHEAR
SIZE
SOLIDS
TURBULENT FLOW