Comparative study of some constitutive equations characterising non-Newtonian fluids

1967 ◽  
Vol 66 (6) ◽  
pp. 342-352 ◽  
Author(s):  
P. L. Bhatnagar
Keyword(s):  
Comparative Study ◽  
Constitutive Equations ◽  
Newtonian Fluids

Obtaining Constitutive Equations for Thickening and Filtration Non-Newtonian Fluids

2014 ◽  
Vol 802 ◽  
pp. 274-279 ◽  
Author(s):  
Helio de Oliveira ◽  
Bruno Arantes Moreira ◽  
João Jorge Ribeiro Damasceno ◽  
Fabio de Oliveira Arouca
Keyword(s):  
Constitutive Equations ◽  
Xanthan Gum ◽  
Sediment Concentration ◽  
Particulate Material ◽  
Newtonian Fluids ◽  
Liquid Separation ◽  
Separation Processes ◽  
Medium Permeability ◽  
Solid Liquid ◽  
Solid Liquid Separation

The study of filtration and thickening of particulate systems are used in many industrial processes involving processes of solid-liquid separation, such as in sedimentation ponds, filters, the drilling of oil wells, among others. This paper aims to advance the empirical mechanisms involved in the processes of solid-liquid separation and obtain constitutive equations relating the pressure in solids and porous media permeability from non-Newtonian fluids. In the experiments used aqueous solutions of xanthan gum concentration of 0.1% in weight basis in order to ensure non-newtonian means. For the preparation of suspensions, was used calcium carbonate as particulate material in the separation process involved an initial concentration of 12% by volume. The concentrated sediment was maintained between 30 and 48% by volume. Settling tests were carried to term and sediments resulting from each test were evaluated by making use of the Gamma Rays Attenuation Technique (GRAT). The results show that GRAT is effective in determining sediment concentration distributions formed from non-Newtonian solutions, allowing the constitutive equations to obtain pressure and the solid porous medium permeability, very important for simulations of solid-liquid separation processes.

RETRACTED: A comparative study on plaque vulnerability using constitutive equations

Perfusion ◽  
2013 ◽  
Vol 29 (2) ◽  
pp. 178-183 ◽  
Author(s):  
A Karimi ◽  
M Navidbakhsh ◽  
S Faghihi
Keyword(s):  
Comparative Study ◽  
Constitutive Equations ◽  
Plaque Vulnerability
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