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 booklet demonstrates how dynamic habit of unmarried debris can yield helpful info for modeling shipping methods in advanced multiphase flows. thoroughly revised and multiplied, this moment variation covers macroscopic momentum and heat/mass move from a unmarried inflexible or fluid particle or ensembles of debris concerning powerful inter-particle interactions together with packed beds, fluidized beds, and porous media with kinds of non-Newtonian fluids. It displays advances made because the e-book of the former, bestselling version with new fabric on themes resembling extensional circulation; 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 great reference and guide facing the technological elements 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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Additional info for Bubbles, Drops, and Particles in Non-Newtonian Fluids, Second Edition
31) RAJ: “dk3171_c002” — 2006/6/8 — 23:03 — page 40 — #32 Non-Newtonian Fluid Behavior 41 The feature that distinguishes it from a Newtonian fluid is the term reflecting an influence of the rate of change of stress whose importance is weighed by a relaxation time, λ0 . An important characteristic of the Maxwell fluid is its predominant fluid-like behavior. 22b). 22c). One of the main virtues of the linear visco-elastic models is that they can be conveniently superposed by introducing a spectrum of relaxation times, as exhibited by polymeric materials in practice, or by including higher time derivatives.
This development was prompted by the increasing significance of a range of materials encountered in a large variety of commercial applications cutting across a number of industrial settings. The flow behavior of this new class of materials does not conform to the Newtonian postulate, and accordingly, such materials are known as non-Newtonian fluids. ), agricultural and dairy wastes, magmas, and lava (Griffiths, 2000; Petford, 2003), etc. Indeed, non-Newtonian fluid behavior is so widespread that it would be no exaggeration to say that simple Newtonian fluid behavior is an exception rather than the rule!
An important characteristic of the Maxwell fluid is its predominant fluid-like behavior. 22b). 22c). One of the main virtues of the linear visco-elastic models is that they can be conveniently superposed by introducing a spectrum of relaxation times, as exhibited by polymeric materials in practice, or by including higher time derivatives. Alternatively, using the idea of superposition, one can assume the stress to be due to a summation of a number of small partial stresses, each pertaining to a partial strain, and each stress relaxing according to some relaxation law.
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