By R.P. Chhabra

Bubbles, Drops, and debris in Non-Newtonian Fluids, moment version maintains to supply thorough assurance of the clinical foundations and the most recent advances in particle movement in non-Newtonian media. The ebook demonstrates how dynamic habit of unmarried debris can yield precious info for modeling delivery approaches in complicated multiphase flows. thoroughly revised and multiplied, this moment version covers macroscopic momentum and heat/mass move from a unmarried inflexible or fluid particle or ensembles of debris regarding powerful inter-particle interactions together with packed beds, fluidized beds, and porous media with types of non-Newtonian fluids. It displays advances made because the booklet of the former, bestselling version with new fabric on themes akin to extensional move; time-independent, time-dependent and visco-elastic fluids; unfastened 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 superb reference and guide facing the technological elements of non-Newtonian fabrics encountered in nature and in expertise, this e-book highlights qualitative transformations among the reaction of a Newtonian and non-Newtonian fluids within the complicated flows encountered in processing purposes.

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Extra info for Bubbles, drops, and particles in non-Newtonian fluids

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This empirical approach is believed to be useful in providing crude estimates for process engineering design calculation purposes. However, it is not yet known if these materials also exhibit limiting viscosities at very high or low shear rates. 2 TIME-DEPENDENT BEHAVIOR For many industrially important materials, the shear flow properties depend on both the rate of shear as well as on the time of shearing. For instance, when the aqueous suspensions of red mud and of bentonite, crude oils, building materials and certain food-stuffs, etc.

Exhibit viscoelastic behavior; they have some ability to store energy and thus show partial recovery upon the removal of stress. These fluids also show memory effects in so far that they can remember the “events” that occurred in the past. , and these and other similar phenomena have been adequately dealt with by Bird et al. (1987a), Barnes et al. (1989), and by Boger and Walters (1992) in their excellent books. , 1997; Larson, 1998; Lakes, 1999; Gupta, 2000; Tanner, 2000; Morrison, 2001). Here we shall only touch upon the so-called primary and secondary normal stress differences observed in steady shearing, and the Trouton ratio in uniaxial elongation flows that are used both to label a fluid as visco-elastic or visco-inelastic as well as to ascertain the importance of visco-elastic effects for a given material in an envisaged application.

While the chapter is mainly limited to the sedimentation of spherical and nonspherical particles in cylindrical domains, some key references are also provided for the other shapes of confining boundaries. Finally, in Chapter 11, attention is focused on the applicability of the falling object rheometry for Newtonian and non-Newtonian systems. In particular, consideration has been given to the methods based on the application of the falling ball, the rolling ball, the rotating sphere, and the falling cylinder configurations.

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