Prediction of solids circulation rate in a spouted bed
Several models (including that of an inviscid fluid, that of a Coulomb plastic with and without the condition of coaxiality, and some which are purely kinematic) have been applied to the annular region of a spouted bed in an attempt to determine the streamlines of the solids flow. Under certain boundary conditions, each model gives essentially the same solution (to within a multiplicative constant, the total solids circulation rate, G/sub a/) which is in qualitative agreement with data taken on a half-bed using stroboscopic photography. This indicates that the circulation patterns in the bed are strongly dominated by the boundary conditions. The solution, PSI(r,z,G/sub a/), together with the Mohr-Coulomb failure law (assuming an active state of stress) may be coupled with the momentum equations and the assumption that at the spout-annular interface, all stresses vanish. This relates the spout radius, the total solids circulation rate, and the physical parameters of the bed, a result which can be coupled with existing predictions of the spout radius (as a function of fluid flow rate) to obtain the total solids circulation rate. Flow visualization experiments and a transit-time fiber optic probe are used on beds of various geometries to validate these results.
- OSTI ID:
- 6507294
- Report Number(s):
- CONF-861146-; TRN: 87-023673
- Resource Relation:
- Conference: AIChE winter annual meeting, Miami, FL, USA, 2 Nov 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FLUIDIZED BEDS
FLOW MODELS
SOLIDS FLOW
BOUNDARY CONDITIONS
COULOMB FIELD
FIBER OPTICS
FLOW RATE
FLUID FLOW
INTERFACES
PHOTOGRAPHY
PLASTICS
PROBES
TWO-PHASE FLOW
ELECTRIC FIELDS
MATERIALS
MATHEMATICAL MODELS
PETROCHEMICALS
PETROLEUM PRODUCTS
SYNTHETIC MATERIALS
420400* - Engineering- Heat Transfer & Fluid Flow