By R.P. Chhabra
Bubbles, Drops, and debris in Non-Newtonian Fluids, moment variation maintains to supply thorough insurance of the medical foundations and the newest advances in particle movement in non-Newtonian media. The publication demonstrates how dynamic habit of unmarried debris can yield priceless info for modeling delivery methods in advanced multiphase flows. thoroughly revised and improved, this moment version covers macroscopic momentum and heat/mass move from a unmarried inflexible or fluid particle or ensembles of debris concerning robust inter-particle interactions together with packed beds, fluidized beds, and porous media with sorts of non-Newtonian fluids. It displays advances made because the ebook of the former, bestselling variation with new fabric on themes comparable to extensional circulation; time-independent, time-dependent and visco-elastic fluids; loose settling habit of non-spherical debris; and particle movement in visco-elastic and visco-plastic fluids, boundary layer flows, flows in porous media, and falling item rheometry. a very good reference and guide facing the technological points of non-Newtonian fabrics encountered in nature and in know-how, this e-book highlights qualitative ameliorations among the reaction of a Newtonian and non-Newtonian fluids within the complicated flows encountered in processing functions.
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Additional info for Bubbles, Drops, and Particles in Non-Newtonian Fluids, Second Edition (Chemical Industries)
2 Visco-Plastic Fluids This class of materials is characterized by the existence of a yield stress (τ0 ) that must be exceeded before the fluid will deform or flow. Once the applied stress exceeds the yield stress, the flow curve may be linear or nonlinear. It should be noted that such a substance is not really a fluid according to the strict physical definition. One can, however, explain this type of behavior by postulating that the substance at rest consists of a three-dimensional structure of sufficient rigidity or strength to resist any external stress less than τ0 .
The scant work dealing with the simultaneous flow of a non-Newtonian liquid and a gas through a packed bed is also included in this chapter. The chapter is concluded by presenting a brief discussion on the variety of anomalous phenomena observed in packed beds such as slip effects, adsorption, gel formation, differences between the bulk and the in situ rheological characteristics, mechanical degradation of polymers in flow conditions, etc. Hydrodynamically similar problems of fluidization and sedimentation are treated in Chapter 8.
3 VISCO-ELASTIC BEHAVIOR OF FLUIDS In the classical theory of elasticity, the stress in a sheared body is directly proportional to the strain. 22) When a solid deforms within the elastic limit, it regains its original form on removal of the stress. However, if the applied stress exceeds the characteristic yield point of the material, complete recovery will not occur, and creep will occur. In other words, the solid will have flowed. 1). Many substances show both elastic and viscous effects under appropriate circumstances.
Bubbles, Drops, and Particles in Non-Newtonian Fluids, Second Edition (Chemical Industries) by R.P. Chhabra