An investigation of the behavior of a classifying hydrocyclone with pseudoplastic fluids

Abstract

-The procedure usually employed for specifying a set of hydrocyclones used in Newtonian fluidsolid separation processes can be extended to the case of non-Newtonian fluids. The apparent viscosity, μ app , is the link between the two cases, and can be evaluated from the knowledge of the shear stress function, S, and the characteristic rate of shear, λ*. In order to verify the validity of this, experiments using suspensions of different solids in an aqueous solution of carboxymethylcellulose (CMC), with pseudoplastic behavior, in an AKW commercial hydrocyclone have been performed. The results obtained in this work indicated that the separation process and the pressure drop in the hydrocyclone cannot be characterized by a single apparent viscosity associated parameter.

Mathematical models of hydrocyclone performance in various copper ores preparation circuits

“…Obtaining of certain recommendations for monitoring strategy from these models is very difficult [22,23,32]. According to many authors [7,8,14,15,17,19,21,27,28,29,30,31,33] the cut point and other characteristics of hydrocyclone work depend on many technical parameters of device and feed features. Generally, it is accepted that exponential and multiplied models are in use.…”

Modular mini-hydrocyclone desilter type of 30mm: An experimental and optimization study

“…Thus, for the application of the mathematical models obtained in this study in the prediction of field conditions, correlations should be used. Several experimental and numerical works reported in the literature present expressions or procedures to account the effects of these variables on capacity, pressure drop and separation efficiency or cut diameter of the hydrocyclones (Braun and Bohnet, 1990;Davailles et al, 2012;Scheid et al, 2013;Kawatra et al, 1996). It's important to state that experimental tests in conditions similar to those encountered in the field are required to validate and confirm the predicted results.…”

Mini-hidrociclones aplicados ao sistema de controle de sólidos na perfuração de poços de petróleo

“…ou que envolvam simulações de fluidodinâmica computacional (CFD). Esses tipos de estudo, ainda que forneçam resultados com baixos custos e quase nenhum trabalho experimental, esbaram na ausência de modelos confiáveis para a correta modelagem da turbulência em meios não-Newtonianos.Destaque deve ser dado ao recente trabalho publicado porScheid et al (2013), onde tentou-se pela primeira vez correlacionar o desempenho de hidrociclones a um parâmetro ligado a característica reológica do fluido utilizado na operação do mesmo. Os autores utilizaram para isso o conceito de viscosidade aparente, atrelado a uma taxa de cisalhamento característica ao equipamento analisado.…”