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1
Content available remote Hall effect on thermosolutal instability of Walters' (model B') fluid in porous medium
100%
Sunil , Sharma R. C. , Pal M.
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2001
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tom Vol. 53, nr 6
677-690
EN
The thermosolutal instability of Walters' (model B') fluid in porous medium is considered in the presence of uniform vertical magnetic field to include the effect of Hall currents. For the case of stationary convection, the stable solute gradient and magnetic field have stabilizing effects on the system, whereas the Hall currents have destabilizing effect on the system. The medium permeability has both stabilizing and destabilizing effects on the system depending on the Hall parameter M. The kinematic viscoelasticity has no effect for stationary convection. The kinematic viscoelasticity, stable solute gradient and magnetic field (and the corresponding Hall currents) introduce oscillatory modes in the system, which were non-existent in their absence. The sufficient conditions for the non-existence of overstability are also obtained.
2
Content available remote Hall effect on MHD flow and heat transfer of nanofluids over a stretching wedge in the presence of velocity slip and Joule heating
100%
Su X. , Zheng L.
Open Physics
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2013
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tom 11
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nr 12
1694-1703
EN
This paper deals with the boundary layer flow and heat transfer of nanofluids over a stretching wedge with velocity-slip boundary conditions. In this analysis, Hall effect and Joule heating are taken into consideration. Four different types of water-base nanofluids containing copper (Cu), silver (Ag), alumina (Al2O3), and titania (TiO2) nanoparticles are analyzed. The partial differential equations governing the flow and temperature fields are converted into a system of nonlinear ordinary differential equations using a similarity transformation. The resulting similarity equations are then solved by using the shooting technique along with the fourth order Runge-Kutta method. The effects of types of nanoparticles, the volume fraction of nanoparticles, the magnetic parameter, the Hall parameter, the wedge angle parameter, and the velocityslip parameter on the velocity and temperature fields are discussed and presented graphically, respectively.
3
Content available remote Hydromagnetic unsteady mixed convectionand mass transfer flow past a vertical porous plate immersed in a porous medium with the hall effect
100%
Sharma B. K. , Chaudhary R. C.
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tom Vol. 56, iss. 1
3-23
EN
The present work is concerned with unsteady mixed convection and mass transfer flow with Hall effect of an electrically conducting incompressible viscous fluid through a porous medium bounded by an infinite vertical plate subjected to suction/injection velocity in the presence of a constant magnetic field. The magnetic field is applied transversely to the direction of the flow. The resulting problem has been solved analytically and the solutions are found for velocity, temperaturę, concentration of the species, skin-friction, surface heat flux and mass flux. The effects of materiał parameters on the flow characteristics are expressed and illustrated/discussed by graphs and table.
4
Content available remote Series solution of hydromagnetic flow and heat transfer with Hall effect in a second grade fluid over a stretching sheet
88%
Ayub M. , Zaman H. , Ahmad M.
Open Physics
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2010
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tom 8
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nr 1
135-149
EN
We examine the problem of flow and heat transfer in a second grade fluid over a stretching sheet [K. Vajravelu, T. Roper, Int. J. Nonlinear Mech. 34, 1031 (1999)]. The equations considered by Vajravelu and Roper [K. Vajravelu, T. Roper, Int. J. Nonlinear Mech. 34, 1031 (1999)], are found to be incorrect in the literature. In this paper, we not only corrected the equation but found a useful analytic solution to this important problem. We also extended the problem for hydromagnetic flow and heat transfer with Hall effect. The explicit analytic homotopy solution for the velocity field and heat transfer are presented. Graphs for the velocity field, skin friction coefficient, and rate of heat transfer are presented. Tables for the skin friction coefficient and rate of heat transfer are also presented. The convergence of the solution is also properly checked and discussed.
5
Content available remote Determination of the LO phonon energy by using electronic and optical methods in AlGaN/GaN
88%
Celik O. , Tiras E. , Ardali S. , Lisesivdin S. , Ozbay E.
Open Physics
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2012
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tom 10
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nr 2
485-491
EN
The longitudinal optical (LO) phonon energy in AlGaN/GaN heterostructures is determined from temperature-dependent Hall effect measurements and also from Infrared (IR) spectroscopy and Raman spectroscopy. The Hall effect measurements on AlGaN/GaN heterostructures grown by MOCVD have been carried out as a function of temperature in the range 1.8-275 K at a fixed magnetic field. The IR and Raman spectroscopy measurements have been carried out at room temperature. The experimental data for the temperature dependence of the Hall mobility were compared with the calculated electron mobility. In the calculations of electron mobility, polar optical phonon scattering, ionized impurity scattering, background impurity scattering, interface roughness, piezoelectric scattering, acoustic phonon scattering and dislocation scattering were taken into account at all temperatures. The result is that at low temperatures interface roughness scattering is the dominant scattering mechanism and at high temperatures polar optical phonon scattering is dominant.
6
Hall effect on thermal instability of Walters' (model B?) fluid in a porous medium
88%
Sunil , Kumar P.
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2000
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tom Vol. 5, no 3
655-671
EN
The thermal instability of Walters' (model B') fluid in a porous medium is considered in the presence of a uniform vertical magnetic field to include the effect of Hall currents. For the case of stationary convection, the magnetic field has the stabilizing effect on the system, whereas the Hall currents have destabilizing effect on the system. The porous medium permeability has both stabilizing and destabilizing effects on the system depending on the Hall parameter M. The kinematic viscoelasticity has no effect on stationary convection. The kinematic viscoelasticity and magnetic field (and corresponding Hall currents) introduce oscillatory modes in the system, which were nonexistent in their absence. The sufficient conditions for the non-existence of overstability are also obtained.
7
Content available remote MHD flow and heat transfer of a Bingham fluid in an eccentric annulus with the Hall effect
88%
Sayed-Ahmed M. E. , Attia H. A.
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2007
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tom Vol. 14, No. 1
25-42
EN
The steady laminar flow and heat transfer of an incompressible, electrically conducting, non-Newtonian Bingham fluid in an eccentric annulus are studied in the presence of an external uniform magnetic field. The inner cylinder is subject to a constant heat flux while the outer cylinder is adiabatic and, the viscous and Joule dissipations are taken into consideration. The governing momentum and energy equations are solved numerically using the finite difference approximations. The velocity, the temperature, the volumetric flow rate and the average Nusselt number are computed for various values of the physical parameters.
8
Study of the effect of localised axial magnetic field on discharge current using the Hall effect
75%
Paingankar A. , Chitra N. , Shirodkar V.
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1998
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tom Vol. 39, no 2
221-235
EN
The influence of localised axial magnetic field on discharge current in a low pressure, fry air dc discharge has been studied. The distinctive nature of the variation in discharge current was found to depend on the region to which the axial magnetic field was applied. In order to qualitatively explain this phenomenon, various plasma parameters in each region of discharge have been determined using Hall effect.
9
Content available remote Past and present of Hall effect applications
51%
Maniewski R. , Zawicki I.
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tom Vol. 22, no. 2-3
113-128
EN
The article presents the review of the Hall-effect applications in measurement technique, especially the research in this field carried out some time ago at the Institute of Biocybernetics and Biomedical Engineering PAS. The idea and constructions of many Hall-effect devices e.g. teslometers, electric power transducers, mechano-electric transducers for displacement and vibration measurements, seismograph and acceleration transducer are described in the article. Special attention was paid to biomedical applications of Hall-generators like mechanocardiograms and tremor recording as well as to the present status of the Hall-effect applications in measurements and automatic control.
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