By R.P. Chhabra
Bubbles, Drops, and debris in Non-Newtonian Fluids, moment version keeps to supply thorough insurance of the clinical foundations and the most recent advances in particle movement in non-Newtonian media. The booklet demonstrates how dynamic habit of unmarried debris can yield important details for modeling shipping procedures in advanced multiphase flows. thoroughly revised and improved, 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 forms of non-Newtonian fluids. It displays advances made because the book of the former, bestselling version with new fabric on issues akin to extensional circulate; 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 very good reference and instruction manual facing the technological points of non-Newtonian fabrics encountered in nature and in expertise, this booklet highlights qualitative adjustments among the reaction of a Newtonian and non-Newtonian fluids within the advanced flows encountered in processing purposes.
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Extra info for Bubbles, drops, and particles in non-Newtonian fluids
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. While all these methods have proved to be of immense value (particularly at high pressures and temperatures) for both qualitative and quantitative measurements of viscosity and of product quality for Newtonian systems, their utility to non-Newtonian fluids is severely limited. This is simply due to the complexity of the flow field prevailing in these devices.
A fluid with a linear flow curve for |τyx | > |τ0 | is called a Bingham plastic fluid and is obviously characterized by a constant value of plastic viscosity. 7 Shear stress–shear rate data for a meat extract and a carbopol solution displaying Bingham plastic and visco-plastic behaviors. 40 Pa s, respectively. 7. Strictly speaking, it is very difficult to ascertain whether any real material has a true yield stress (Houwink and de Decker, 1971; Barnes and Walters, 1985; Cheng, 1986; Hartnett and Hu, 1989; Astarita, 1990; Schurz, 1990; Barnes, 1992,1999, 2001; Evans, 1992; Balan, 1999).
21 Extensional behavior of a PIB solution. √ that is, in the denominator, the shear viscosity is evaluated at γ˙ = ε˙ 3. They also suggested that for inelastic isotropic liquids, the Trouton ratio is equal to 3 for all values of ε˙ and γ˙ , and any departure from the value of 3 can be ascribed unambiguously to the visco-elasticity of the liquid. 30 implies that for an inelastic shear-thinning fluid, the extensional viscosity must also decrease with increasing rate of extension resulting in the so-called tension-thinning.
Bubbles, drops, and particles in non-Newtonian fluids by R.P. Chhabra