Obtaining Constitutive Equations for Thickening and Filtration Non-Newtonian Fluids

Abstract:

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.

• Periodical: Materials Science Forum (Volume 802)
• Pages: 274-279
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.802.274
• Online since: December 2014
• Authors: Helio de Oliveira, Bruno Arantes Moreira, João Jorge Ribeiro Damasceno, Fabio de Oliveira Arouca
• Keywords: GRAT, Permeability, Pressure in Solid, Volumetric Concentration

References

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