Aerated and vibrated chute feeders for particulate materials
Granular materials in flow exhibit behavior that is both solid-like and fluid-like. When subjected to slow deformation in a dense state, the stress within a granular medium is independent of the rate of deformation. In this regime, individual grains are in semi-permanent contact with their neighbors and stress is generated as a result of rubbing'' between grains. In a very different regime, which occurs during rapid deformation and at moderate to low densities, the grains are in vigorous motion and momentum is transferred as a result of short-term collisions between grains. The stress in this situation has a quadratic dependence on the rate of deformation. These two regimes are extremes, though, and most practical situations fall somewhere in between. Recently, a constitutive theory has been proposed for general situations where both modes of momentum transport may be present. This frictional-collisional'' constitutive theory has been used in this work to study granular flow in chutes, aided by the mechanisms of aeration and vibration. In many situations of industrial import, the interaction of grains with the interstitial fluid plays an important role in determining the nature of the flow. This study attempts to incorporate the effect of the interstitial fluid on granular motion. The two phases are treated as interacting continua and the coupled equations of motion for both phases are given. This theory is then applied to the problem of granular flow in an inclined, aerated chute. 84 refs., 45 figs., 2 tabs.
- Research Organization:
- Princeton Univ., NJ (United States). Dept. of Chemical Engineering
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-86PC90518
- OSTI ID:
- 5516500
- Report Number(s):
- DOE/PC/90518-16; ON: DE91011314
- Country of Publication:
- United States
- Language:
- English
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Aerated and vibrated chute feeders for particulate materials: Quarterly technical report for the period June 1, 1987 to August 31, 1987
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Related Subjects
GRANULAR MATERIALS
FLOW RATE
AERATION
COAL
EQUATIONS OF MOTION
MATHEMATICAL MODELS
PROGRESS REPORT
RHEOLOGY
STRESSES
VELOCITY
CARBONACEOUS MATERIALS
DIFFERENTIAL EQUATIONS
DOCUMENT TYPES
ENERGY SOURCES
EQUATIONS
FOSSIL FUELS
FUELS
MATERIALS
PARTIAL DIFFERENTIAL EQUATIONS
013000* - Coal
Lignite
& Peat- Transport
Handling
& Storage