652 research outputs found
Hall current and suction/injection effects on the entropy generation of third grade fluid
In this work, effects of Hall current and suction/injection on a steady,
viscous, incompressible and electrically conducting third grade fluid past a
semi-infinite plate with entropy generation is investigated. It is assumed that
the fluid motion is induced by applied pressure gradient. Hot fluid is injected
with a constant velocity at the injection wall while it is sucked off at the
upper wall with the same velocity. The governing equations of Navier-Stoke,
energy and entropy generation obtained are non-dimensionalised, the
resulting dimensionless velocity and temperature profiles are solved by
Adomian decomposition technique due to the nonlinearity of the coupled
system of equations. The obtained solution for the velocity profile is
validated by the exact solution and the existing one in literature at M = 0 and
the analytical expressions for fluid velocity and temperature are utilized to
calculate the entropy generation and irreversibility ratio. Various plots are
presented and discussed. It is found that increasing Hall current parameter
increases primary velocity, temperature, entropy generation and Bejan
number while the reverse trend is observed when both suction/injection and
magnetic field parameters are increased. It is also noticed that entropy
production at the upper wall is due to heat transfer
Mixed Convection Flow of Couple Stress Fluid in a Vertical Channel with Radiation and Soret Effects
The radiation and thermal diffusion effects on mixed convection flow of couple stress fluid through a channel
are investigated. The governing non-linear partial differential equations are transformed into a system of
ordinary differential equations using similarity transformations. The resulting equations are then solved using
the Spectral Quasi-linearization Method (QLM). The results, which are discussed with the aid of the
dimensionless parameters entering the problem, are seen to depend sensitively on the parameters
Hall Current and Joule Heating Effects on Flow of Couple Stress Fluid with Entropy Generation
In this work, an analytical study of the effects of Hall
current and Joule heating on the entropy generation rate of
couple stress fluid is performed. It is assumed that the applied
pressure gradient induces fluid motion. At constant velocity, hot
fluid is injected at the lower wall and sucked off at the upper
wall. The obtained equations governing the flow are transformed
to dimensionless form and the resulting nonlinear coupled
boundary value problems for velocity and temperature profiles
are solved by Adomian decomposition method. Analytical
expressions for fluid velocity and temperature are used to obtain
the entropy generation and the irreversibility ratio. The effects of
Hall current, Joule heating, suction/injection and magnetic field
parameters are presented and discussed through graphs. It is
found that Hall current enhances both primary and secondary
velocities and entropy generation. It is also interesting that Joule
heating raises fluid temperature and encourages entropy
production. On the other hand Hartman number inhibits fluid
motion while increase in suction/injection parameter leads to a
shift in flow symmetry
Mixed convection flow of couple stress fluid between vertical parallel plates with radiation and chemical reaction effects
Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.This paper studies the effects of thermal radiation and chemical reaction on two dimensional incompressible couple stress fluid flow with mixed convective heat and mass transfer between two vertical parallel plates in a porous space. The plates are kept at different but constant temperature and concentrations. The governing non-linear partial differential equations are transformed into a system of ordinary differential equations using similarity transformations. The resulting equations are then solved using the homotopy analysis method. The effects of the radiation parameter, chemical reaction parameter and couple stress fluid parameter on velocity, temperature and concentrations are discussed and shown graphically. Also the effects of the pertinent parameters on the rates of heat and mass transfer are tabulated.cf201
Recent Trends in Coatings and Thin Film–Modeling and Application
Over the past four decades, there has been increased attention given to the research of fluid mechanics due to its wide application in industry and phycology. Major advances in the modeling of key topics such Newtonian and non-Newtonian fluids and thin film flows have been made and finally published in the Special Issue of coatings. This is an attempt to edit the Special Issue into a book. Although this book is not a formal textbook, it will definitely be useful for university teachers, research students, industrial researchers and in overcoming the difficulties occurring in the said topic, while dealing with the nonlinear governing equations. For such types of equations, it is often more difficult to find an analytical solution or even a numerical one. This book has successfully handled this challenging job with the latest techniques. In addition, the findings of the simulation are logically realistic and meet the standard of sufficient scientific value
ANALYSIS OF ENTROPY GENERATION DUE TO MAGNETOHYDRODYNAMIC COUPLE STRESS FLUID
We demonstrate the first reconfigurable photonic metamaterial controlled by electrical currents and magnetic fields, providing first practically useful solutions for sub-megahertz and high contrast modulation of metamaterial optical properties
Effect of porosity on unsteady MHD convection flow Past a moving vertical plate with ramped wall temperature
The unsteady MHD convective flow of an electrically conducting fluid embedded in a porous medium along moving infinite vertical plate with ramped wall temperature and radiation in a rotating system is investigated here. The fluid taken is incompressible and viscous. The governing PDE’s of the model are solved by using integral transform method. The analytical solutions for the velocity, concentration and temperature are obtained. The expressions for skin friction, rate of mass transfer and heat transfer near the plate are obtained. The effects of various parameters like porosity of the medium, magnetic field, Soret number, thermal radiation, rotation, radiation and Hall current on the flow field are discussed. It is observed that velocity increases with the increase in the porosity parameter K. It reveals that a porous medium having large permeability supports the movement of the fluid in the system. Also, it is noticed that Hall parameter reduces the resistive effect of the applied magnetic field. Such a study assumes importance because both rotation and Hall current induce secondary flow in the flow-field. The results of the research may be useful in many industrial applications
Hall Current and Joule Heating Effects on Flow of Couple Stress Fluid with Entropy Generation
In this work, an analytical study of the effects of Hall current and Joule heating on the entropy generation rate of couple stress fluid is performed. It is assumed that the applied pressure gradient induces fluid motion. At constant velocity, hot fluid is injected at the lower wall and sucked off at the upper wall. The obtained equations governing the flow are transformed to dimensionless form and the resulting nonlinear coupled boundary value problems for velocity and temperature profiles are solved by Adomian decomposition method. Analytical expressions for fluid velocity and temperature are used to obtain the entropy generation and the irreversibility ratio. The effects of Hall current, Joule heating, suction/injection and magnetic field parameters are presented and discussed through graphs. It is found that Hall current enhances both primary and secondary velocities and entropy generation. It is also interesting that Joule heating raises fluid temperature and encourages entropy production. On the other hand Hartman number inhibited fluid motion while increase in suction/injection parameter resulted into a shift in flow symmetry
Hall current, viscous and Joule heating effects on steady radiative 2-D magneto-power-law polymer dynamics from an exponentially stretching sheet with power-law slip velocity : a numerical study
A mathematical model is developed for 2-D laminar, incompressible, electrically conducting
non-Newtonian (Power-law) fluid boundary layer flow along an exponentially stretching
sheet with power-law slip velocity conditions in the presence of Hall currents, transverse
magnetic field and radiative flux. The secondary flow has been induced with appliance of
Hall current. The distinguish features of Joule heating and viscous dissipation are included in
the model since they are known to arise in thermal magnetic polymeric processing.
Rosseland’s diffusion model is employed for radiation heat transfer. The non-linear partial
differential equations describing the flow (mass, primary momentum, secondary momentum
and energy conservation) are transformed into non-linear ordinary differential equations by
employing local similarity transformations. The non-dimensional nonlinear formulated set of
equations is numerically evaluated with famous shooting algorithm by using MATLAB
software. The validation of simulated numerical results has been completed with generalized
differential quadrature (GDQ). Extensive visualization of primary and secondary velocities
and temperature distributions for the effects of the emerging parameters is presented for both
pseudo-plastic fluids (n=0.8) and dilatant fluids (n=1.2). The study is relevant to the
manufacturing transport phenomena in electro-conductive polymers (ECPs)
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