Fluidization dynamics: a predictive theory

L.G. Gibilaro9780750650038, 0-7506-5003-6

Fluidization Dynamics has been written for students and engineers who find themselves involved with problems concerning the fluidized state. It presents an analysis that focuses directly on the problem of predicting the fluid dynamic behaviour of a proposed fluidized system for which empirical data is limited or unavailable. The second objective is to provide a treatment of fluidization dynamics that is readily accessible to the non-specialist. The linear approach adopted in this book, starting with the formulation of predictive expressions for the basic forces that act on a fluidized particle, offers a clear way into the theory. The incorporation of the force terms into the conservation equations for mass and momentum and subsequent applications are presented in a manner that requires only the haziest recollection of elementary fluid-dynamics theory. The analyses presented in this book represent a body of research that has appeared in numerous publications over the last 20 years. L.G. Gibilaro has taken the opportunity to reorder much of the material in the light of subsequent knowledge, to correct minor errors and inconsistencies and to add detail and clarification where necessary. This material helps to form the basis for university course modules in engineering and applied science at undergraduate and graduate level, as well as focused, post-experienced courses for the process, and allied industries. ?· Bridges the gulf between observed behaviour and fluid-dynamic theory ?· Clear account of basic theory of fluidization ?· Accessible treatment of fluidization analysis

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Table of contents :
Contents……Page 5
Preface……Page 9
Acknowledgements……Page 11
Research origins……Page 15
Notation……Page 21
Fluidization……Page 25
Single particle suspension……Page 27
The single particle settling velocity……Page 32
Fluid pressure loss in packed particle beds……Page 38
Fluid pressure loss in expanded particle beds……Page 43
The unrecoverable pressure loss for fluidization……Page 55
The primary forces acting on a fluidized particle……Page 60
The response of homogeneously fluidized beds to sudden changes in fluid flux……Page 66
The dynamic-wave velocity……Page 76
The stability criterion……Page 81
A general formulation……Page 83
Stability analysis 7……Page 87
Fine-powder gas fluidization……Page 94
The primary force interactions……Page 95
Fluid-dynamic elasticity of the particle phase……Page 96
The particle bed model……Page 102
Stability analysis 8……Page 103
The compressible fluid analogy……Page 107
Power classification for fluidization by a specified fluid……Page 109
The minimum bubbling point……Page 113
The wave velocities……Page 120
Conclusions 9……Page 127
Behaviour spectra for fluidization……Page 130
A first measure of fluidization quality……Page 132
Perturbation propagation in fluidized beds……Page 136
A further criterion for fluidization quality……Page 142
Homogeneous fluidization……Page 146
11 The two-phase particle bed model……Page 150
Stability analysis 11……Page 151
Comparison of the one- and two-phase models……Page 157
Liquid-fluidized systems……Page 161
Conclusions 12……Page 166
Cold-model simulations……Page 168
The dimensionless equations of change……Page 169
The scaling relations for fluidization……Page 170
Fluidization quality characterization……Page 179
Comparison of the scaling relations with the fluidization quality criteria……Page 187
The long- and short-wave equations……Page 188
Large perturbations in fluidized beds……Page 192
The jump conditions……Page 193
The effect of the jump in fluid pressure……Page 209
The formation of fluid and solid slugs……Page 212
An idealized fluid-dynamic description of slugging behaviour……Page 214
Particle-particle and particle-wall frictional effects……Page 223
Experimental determinations of slugging characteristics……Page 225
The two-dimensional, two-phase particle bed model……Page 233
The two-dimensional force interactions……Page 234
The two-dimensional, two-phase equations of change……Page 240
Numerical simulations……Page 243
Author index……Page 254
Subject index……Page 255