Abstract
If the theory presented in the foregoing chapter is correct, the elasticity modulus E must be a property of the powder packing. Unfortunately no method is known of measuring this property directly. A first attempt in this direction (Mutsers & Rietema, 1979) was unsuccessful. Therefore, corroboration of the above statement was sought by correlating experimentally derived values of E with other powder properties such as porosity, average particle size, particle size distribution and particle hardness.
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Abbreviations
- C:
-
See Chapter 6
- dp :
-
Particle size (m)
- E:
-
Elasticity modulus (N m -2)
- Emb :
-
Value of E at the bubble point (N m -2)
- E50 :
-
Value of E at a porosity of 50% (N m -2)
- g:
-
Gravitational acceleration (m s -2)
- Hmb :
-
Bed height at the bubble point (m)
- NF :
-
Fluidization number (—)
- r:
-
Radius of rotation (m)
- Uc :
-
Velocity of continuity wave (m s -2)
- vco :
-
Superficial gas velocity (m s -1)
- vmb :
-
Gas velocity at the bubble point (m s -1)
- vmf :
-
Gas velocity at incipient fluidization (m s -1)
- ε:
-
Porosity (—)
- εmb :
-
Porosity at the bubble point (—)
- µ:
-
Gas viscosity (N s m -2)
- ρc :
-
Density of gas (kg m -3)
- ρd :
-
Density of solid particles (kg m -3)
- ω:
-
Angular velocity (s -1)
References and Bibliography
Foscolo, P.U. & Gibilaro, L.G. (1984). A fully predictive criterion for the transition between particulate and aggregative fluidization. Chem. Eng. Sci., 39, 1667.
Foscolo, P.U. & Gibilaro, L.G. (1986). The influence of gravity on the stability of fluidized beds. Chem. Eng. Sci., 41, 2438.
Mutsers, S.M.P. & Rietema, K. (1977). Gas-solids fluidization in a centrifugal field. The effect of gravity upon bed expansion. Powder Techn., 18, 249.
Mutsers, S.M.P. & Rietema, K. (1979). Direct measurement of the mechanical response of a homogeneously fluidized bed to vertical vibration of an immersed object. Powder Techn., 24, 57, 65.
Oltrogge, R.D. (1972). Gas fluidized bed of fine particles. PhD Thesis, University of Michigan.
Piepers, H.W., Cottaar, E.J.E., Verkooyen, A.H.M. & Rietema, K. (1984). Effects of pressure and type of gas on particle-particle interaction and the consequences for gas-solid fluidization behaviour. Powder Techn., 37, 55.
Rietema, K. & Piepers, H.W. (1990). The effect of interparticle forces on the stability of gas-fluidized beds. I. Experimental evidence. Chem. Eng. Sci., 45, 1627.
Verloop, J. & Heertjes, P.M. (1970). Shock waves as a criterion for the transition from homogeneous to heterogeneous fluidization. Chem. Eng. Sci., 25, 825.
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© 1991 Elsevier Science Publishers Ltd
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Rietema, K. (1991). Experiments with Homogeneous Fluidization. In: The Dynamics of Fine Powders. Elsevier Handling and Processing of Solids Series. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3672-3_7
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DOI: https://doi.org/10.1007/978-94-011-3672-3_7
Publisher Name: Springer, Dordrecht
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