Bubbles, drops, and particles in non-Newtonian fluids by R.P. Chhabra

By R.P. Chhabra

Bubbles, Drops, and debris in Non-Newtonian Fluids, moment version keeps to supply thorough assurance of the medical foundations and the newest advances in particle movement in non-Newtonian media. The ebook demonstrates how dynamic habit of unmarried debris can yield priceless info for modeling shipping procedures in advanced multiphase flows. thoroughly revised and elevated, this moment variation covers macroscopic momentum and heat/mass move from a unmarried inflexible or fluid particle or ensembles of debris regarding robust inter-particle interactions together with packed beds, fluidized beds, and porous media with kinds of non-Newtonian fluids. It displays advances made because the ebook of the former, bestselling version with new fabric on issues akin 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. an outstanding reference and guide facing the technological facets of non-Newtonian fabrics encountered in nature and in know-how, this e-book highlights qualitative modifications among the reaction of a Newtonian and non-Newtonian fluids within the complicated flows encountered in processing purposes.

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

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15 Rheopectic behavior in a saturated polyester (Steg and Katz 1965). container was rolled gently in the palms of hands. 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.

2 for a few aqueous solutions and suspensions (Chhabra, 1980). Considerable confusion exists in the literature regarding the effect of temperature on the values of power-law constants. 56–883 1–50 the consistency coefficient m decreases with increasing temperature. In most process engineering applications, it is sufficient to neglect the temperaturedependence of the flow behavior index and to use the usual Arrhenius-type expression to approximate the temperature dependence of the consistency coefficient (Chhabra, 1999b).

Therefore, there exists a delicate balance between the efficacy of a constitutive relation to describe the behavior of a fluid in well-defined flows and the utility of the fluid-model parameters so evaluated in interpreting the behavior of the same fluid in a complex flow problem.

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