Newtonian Fluid

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Bikash Sahoo - One of the best experts on this subject based on the ideXlab platform.

  • Effects of slip on steady Bödewadt flow of a non-Newtonian Fluid
    Communication Nonlinear Science Numerical Simulation, 2012
    Co-Authors: Bikash Sahoo, Sébastien Poncet
    Abstract:

    The steady flow arising due to the rotation of a non-Newtonian Fluid at a larger distance from a stationary disk is extended to the case where the disk surface admits partial slip. The constitutive equation of the non-Newtonian Fluid is modeled by that for a Reiner- Rivlin Fluid. The momentum equation gives rise to a highly nonlinear boundary value problem. Numerical solution of the governing nonlinear equations are obtained over the entire range of the physical parameters. The effects of slip and non-Newtonian Fluid characteristics on the momentum boundary layer are discussed in details. It is observed that slip has prominent effect on the velocity field, whereas a predominant influence of the non-Newtonian parameter is observed on the moment coefficient.

  • effects of slip on steady bodewadt flow and heat transfer of an electrically conducting non Newtonian Fluid
    Communications in Nonlinear Science and Numerical Simulation, 2011
    Co-Authors: Bikash Sahoo
    Abstract:

    Abstract The steady flow and heat transfer arising due to the rotation of a non-Newtonian Fluid at a larger distance from a stationary disk is extended to the case where the disk surface admits partial slip. The constitutive equation of the non-Newtonian Fluid is modeled by that for a Reiner–Rivlin Fluid. The Fluid is subjected to an external uniform magnetic field perpendicular to the plane of the disk. The momentum equation gives rise to a highly nonlinear boundary value problem. Numerical solution of the governing nonlinear equations are obtained over the entire range of the physical parameters. The effects of slip, non-Newtonian Fluid characteristics and the magnetic interaction parameter on the momentum boundary layer and thermal boundary layer are discussed in detail and shown graphically. It is observed that slip has prominent effects on the velocity and temperature fields.

Sébastien Poncet - One of the best experts on this subject based on the ideXlab platform.

  • Effects of slip on steady Bödewadt flow of a non-Newtonian Fluid
    Communication Nonlinear Science Numerical Simulation, 2012
    Co-Authors: Bikash Sahoo, Sébastien Poncet
    Abstract:

    The steady flow arising due to the rotation of a non-Newtonian Fluid at a larger distance from a stationary disk is extended to the case where the disk surface admits partial slip. The constitutive equation of the non-Newtonian Fluid is modeled by that for a Reiner- Rivlin Fluid. The momentum equation gives rise to a highly nonlinear boundary value problem. Numerical solution of the governing nonlinear equations are obtained over the entire range of the physical parameters. The effects of slip and non-Newtonian Fluid characteristics on the momentum boundary layer are discussed in details. It is observed that slip has prominent effect on the velocity field, whereas a predominant influence of the non-Newtonian parameter is observed on the moment coefficient.

Martin Böhle - One of the best experts on this subject based on the ideXlab platform.

  • A new design method for propeller mixers agitating non-Newtonian Fluid flow
    Chemical Engineering Science, 2018
    Co-Authors: Thomas Reviol, S. Kluck, Martin Böhle
    Abstract:

    Abstract The common design methods for mixers agitating non-Newtonian Fluid flow are not suitable for developing a completely new geometrical shape. These design methods were originally intended only to scale an existing mixer with several correlation methods. For this, the dimensionless power characteristics of the mixer is first determined for agitating Newtonian Fluid flow. Subsequently, for the desired operating conditions, the apparent viscosity of the non-Newtonian Fluid is derived using the mentioned correlation principles. After setting the desired geometrical parameters, it is possible to calculate the apparent Reynolds number. By comparing the apparent Reynolds number with the dimensionless power characteristics, the estimated power consumption and, therefore, the engine to drive the mixer can be determined. This procedure comes with the assumption of a valid correlation between Newtonian and non-Newtonian Fluid flow, which is not physical. Furthermore, the question of how to develop the geometric shape of a mixer for a considered operation point is still open. In this paper, a new method is introduced to develop the shape of a propeller mixer for arbitrary operating conditions in pseudo-plastic Fluids by analytical methods. The method is based on the consequently implemented blade element momentum theory.

  • Investigation of the influence of viscoelastic behaviour on the agitation of non-Newtonian Fluid flow
    Chemical Engineering Science, 2016
    Co-Authors: Thomas Reviol, S. Kluck, F. Genuit, V. Reim, Martin Böhle
    Abstract:

    Abstract The design process of mixers agitating non-Newtonian Fluid flow is usually performed with several well-known correlation methods. These methods have been the issue of many studies of the last few decades, so they are well discovered and often extended. But these studies also disclose the dependency of the correlation methods on the rheology of the Fluid flow. Due to the good applicability the discovered dependencies were often neglected. In this paper the existing methods will be investigated experimentally for agitating viscoelastic as well as viscoinelastic Fluid flow to determine the influence of viscoelasticity on the power consumption of agitating non-Newtonian Fluid flow.

Helge I. Andersson - One of the best experts on this subject based on the ideXlab platform.

  • Shear flow of a Newtonian Fluid over a quiescent generalized Newtonian Fluid
    Meccanica, 2017
    Co-Authors: Swati Mukhopadhyay, Helge I. Andersson
    Abstract:

    The flow of an upper shear-driven Newtonian Fluid above an otherwise still non-Newtonian Fluid is considered. The lower Fluid is modelled as a generalized Newtonian Fluid and set into motion by interfacial shear. By means of similarity transformations, the governing partial differential equations for the two-Fluid problem transform exactly into two sets of ordinary differential equations coupled only at the interface. The successful transformation of the two-Fluid problem is applied to the particular case when the lower Fluid obeys power-law rheology. The resulting three-parameter problem is solved numerically for some different parameter combinations by means of a direct integration approach with the density ratio fixed to unity. We observed that the interfacial velocities decreased with increasing values of the power-law index n in the range from 0.6 to 1.4 whereas the shear-induced motion of the lower Fluid penetrates far deeper into a shear-thinning ( n   1) Fluid. This phenomenon is ascribed to a corresponding increase of the non-linear viscosity function with lower n -values.

Ayten S. Bakhtiyarova - One of the best experts on this subject based on the ideXlab platform.

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