By R.P. Chhabra
Bubbles, Drops, and debris in Non-Newtonian Fluids, moment variation keeps 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 priceless info for modeling delivery tactics in complicated multiphase flows. thoroughly revised and increased, 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 varieties of non-Newtonian fluids. It displays advances made because the ebook of the former, bestselling version with new fabric on issues similar to extensional move; 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 great reference and instruction manual facing the technological facets of non-Newtonian fabrics encountered in nature and in know-how, this ebook highlights qualitative changes among the reaction of a Newtonian and non-Newtonian fluids within the complicated flows encountered in processing purposes.
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Additional info for Bubbles, drops, and particles in non-Newtonian fluids
Thus, the structure formation is facilitated by a gentle shearing motion (rolling) but a more intense motion (shaking) destroys the structure. This suggests that there is a critical amount of shear beyond which re-formation of structure is not induced but breakdown occurs. They attributed this behavior to the anisometric shape of RAJ: “dk3171_c002” — 2006/6/8 — 23:03 — page 31 — #23 32 Bubbles, Drops, and Particles in Fluids gypsum particles. It is not uncommon for the same suspension/dispersion to display both thixotropy as well as rheopexy under appropriate conditions of shear rate and the solid contents.
Limited efforts have also been made to establish the nature of dependences of the fluid model parameters on composition, temperature, etc. , 1998). ) of the material. 3 Shear-Thickening Fluids These materials, also known as dilatant materials, are similar to shear-thinning materials in that they show no yield stress but their apparent viscosity increases with increasing shear rate. This type of flow behavior is encountered in concentrated suspensions of solids, and can be qualitatively explained as follows: When a suspension is at rest, the voidage is minimum and the liquid present is just sufficient to fill the void spaces.
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. In particular, the influence of non-Newtonian characteristics on the bed expansion dynamics, minimum fluidization velocity, and the rate of sedimentation of concentrated suspensions in the initial constant concentration region are examined in this chapter.
Bubbles, drops, and particles in non-Newtonian fluids by R.P. Chhabra
Categories: Fluid Dynamics