Journal ArticleDOI
Improved parametric characterization of flow geometries
W. Kozicki,Carlos Tiu +1 more
TLDR
In this article, an improved parametric method is presented for characterization of the flow geometry in the rectilinear flow of non-Newtonian fluids in open and closed conduits of arbitrary crosssection.Abstract:
An improved parametric method is presented for characterization of the flow geometry in the rectilinear flow of non-Newtonian fluids in open and closed conduits of arbitrary crosssection and in purely viscous, inelastic flow of non-Newtonian fluids through packed beds and porous media. In the new formulation, an infinite number of geometric parameters characterize the flow geometry. The actual number required in a particular application is shown to be determined by the fluid model equation representing the rheological behavior of the fluid. For Ostwald-de-Waele and Ellis fluids with flow behavior indices s = 1/n and α integers, the number of geometric parameters required to represent the relationship between flow rate and pressure drop is given by s + 1 and α + 1, respectively. The efficacy of the present method is demonstrated by comparisons with available results for various fluid models and flow geometries.read more
Citations
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Book ChapterDOI
Heat transfer to newtonian and non-newtonian fluids in rectangular ducts
J.P. Hartnett,Milivoje M. Kostic +1 more
TL;DR: In this paper, the authors provide an overview of the analytical and experimental hydrodynamics and heat transfer studies of Newtonian and non-Newtonian fluids in laminar and turbulent flow through rectangular tubes.
Journal ArticleDOI
Fully developed laminar flow of purely viscous non-Newtonian liquids through annuli, including the effects of eccentricity and inner-cylinder rotation
TL;DR: In this article, the results of extensive numerical calculations, carried out using a highly accurate finite-volume method, for the fully developed laminar flow of an inelastic shear-thinning power-law fluid through an eccentric annulus with inner cylinder rotation are presented.
Journal ArticleDOI
On turbulent drag and heat transfer reduction phenomena and laminar heat transfer enhancement in non-circular duct flow of certain non-Newtonian fluids
TL;DR: In this article, it is argued that turbulence suppression due to flow-induced anisotropic fluid structure and properties, is a determining factor for the reduction phenomena, not the fluid elasticity.
Journal ArticleDOI
Modelling the flow of power law fluids in a packed bed using a volume-averaged equation of motion
TL;DR: In this article, the authors developed a theoretical model for the prediction of velocity and pressure drop for the flow of a viscous power law fluid through a bed packed with uniform spherical particles.
Journal ArticleDOI
Fully developed turbulent flow of non-Newtonian liquids through a square duct
P. Escudier,S. Smith +1 more
TL;DR: In this paper, the results of an experimental investigation of fully developed turbulent flow through a square duct of water (as a control) and of two polymers, an aqueous solution of 0.1% carboxymethylcellulose + 0. 1% Keltrol TF, a xanthan gum (CMC/XG) and a 0.125% polyacrylamide, Separan AP 273 (PAA), were reported.
References
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Journal ArticleDOI
Non-Newtonian flow in ducts of arbitrary cross-sectional shape
W. Kozicki,C.H. Chou,C. Tiu +2 more
TL;DR: In this paper, two general equations are proposed for prediction of the flow rate and maximum velocity versus pressure drop relationship in the isotherma,l steady, uniform, laminar flow of incompressible, time-independent non-Newtonian fluids in ducts of arbitrary cross section.
Journal ArticleDOI
Non-Newtonian flow through packed beds and porous media
W. Kozicki,C.J. Hsu,C. Tiu +2 more
TL;DR: In this paper, the Blake-Kozeny model has been used for viscous flow of an arbitrary time-independent non-Newtonian fluid through packed beds and porous media.
Journal ArticleDOI
The friction factor–Reynolds number relation for the steady flow of pseudoplastic fluids through rectangular ducts. Part I. Theory
TL;DR: In this paper, a finite difference technique was used to calculate the velocity profile, maximum shear stress, and friction factor-Reynolds number product for a power-law, pseudoplastic fluid flowing through a cylindrical duct of rectangular cross section.
Journal ArticleDOI
On the steady flow of a non-Newtonian fluid in cylinder ducts
TL;DR: In this paper, a variational principle evolved from minimum entropy considerations was used to determine the relationship between the friction factor and the Reynolds number in cylindrical ducts and between two flat plates with the method of Ritz and Galerkin.