Abstract
A large number of chemical operations, biochemical or petrochemical industry is very depending on the rheological fluids nature. In this work, we study the case of highly viscous of viscoplastic fluids in a classical system of agitation: a cylindrical tank with plate bottom without obstacles agitated by gate impeller agitator. We are interested to the laminar, incompressible and isothermal flows. We devote to a numerical approach carried out using an industrial code CFD Fluent 6.3.26 based on the method of finites volumes discretization of Navier - Stokes equations formulated in variables (U.V.P). The threshold of flow related to the viscoplastic behavior is modeled by a theoretical law of Bingham. The results obtained are used to compare between the five configurations suggested of power consumption. We study the influence of inertia by the variation of Reynolds number.
Highlights
Many industrial processes often face difficulties related to the implementation of non-Newtonian fluids such as polymer solutions, detergents, petroleum products, biological fluids, food, drilling fluids and emulsions to be transported, stirred and mixed
We study the case of highly viscous of viscoplastic fluids in a classical system of agitation: a cylindrical tank with plate bottom without obstacles agitated by gate impeller agitator
We have studied the hydrodynamics developed in an agitation in the presence of viscoplastic fluids
Summary
Many industrial processes often face difficulties related to the implementation of non-Newtonian fluids such as polymer solutions, detergents, petroleum products, biological fluids, food, drilling fluids and emulsions to be transported, stirred and mixed. We have studied the hydrodynamics developed in an agitation in the presence of viscoplastic fluids. The objective of this work is the study of mechanical agitation of highly viscous fluid by an agitator-type proximity barrier using five configurations depending on the inclination angles of blades with a non baffled cylindrical tank with flat bottom such that the geometry is close to an industrial setting. The choice of this geometry has the advantage of generating a flow that can, in first approximation considered as a two-dimensional. The results enable a comparative study between five blade configurations chosen especially from the point of view of energy consumption (number of power), this allows us to make a choice of an optimal configuration (i.e.) with low energy consumption
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