Hall Currents

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Stokes First Problem for an Unsteady MHD Third Grade Fluid in a Non Porous Half Space with Hall Currents

Stokes First Problem for an Unsteady MHD Third Grade Fluid in a Non Porous Half Space with Hall Currents

In order to discuss the effects of various parameters on the flow field the graphs are drawn for the variation of the dimensionless velocity f ( η ξ , ) with distance from the surface η . These graphs are plotted for different values of the Hartmann number N , Hall parameter ∈ , homotopy parameter  , second-grade material para- meter α , third-grade material parameters β and ζ . Figures 2 to 7 are plotted in absence of Hall currents.

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COMBINED INFLUENCE OF HALL CURRENTS AND JOULE HEATING ON HEMODYNAMIC PERISTALTIC FLOW WITH POROUS MEDIUM THROUGH A VERTICAL TAPERED ASYMMETRIC CHANNEL WITH RADIATION

COMBINED INFLUENCE OF HALL CURRENTS AND JOULE HEATING ON HEMODYNAMIC PERISTALTIC FLOW WITH POROUS MEDIUM THROUGH A VERTICAL TAPERED ASYMMETRIC CHANNEL WITH RADIATION

The aim of the present attempt is hall currents and joule heating on peristaltic blood flow in porous medium through a vertical tapered asymmetric channel under the influence of radiation. The Mathematical modeling is investigated by utilizing long wavelength and low Reynolds number assumptions. The indicates an appreciable increase in the axial velocity distribution with increase in hall current parameter and porosity parameter whereas the result in axial velocity distribution diminished by increase in magnetic field parameter. The result in pressure gradient reduces by rise in hall current parameter, porosity parameter and volumetric flow rate. The temperature of the fluid increases by increase in M, N, Pr and Br and decreases by increase in m and Da.

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Effect of Hall Currents and Variable Fluid Properties on MHD Flow past Stretching Vertical Plate by the Presence of Radiation

Effect of Hall Currents and Variable Fluid Properties on MHD Flow past Stretching Vertical Plate by the Presence of Radiation

Hence, in the present work, we study Hall currents effects on the MHD free-convective flow of an optically thin gray gas past a semi-infinite vertical plate with variable density, viscosity and thermal conductivity for high temperature differences neglecting the Boussinesq approximation. The nonlinear boundary layer equations, go- verning the problem, are solved numerically by applying an efficient numerical technique based on the shooting method. The velocity and temperature distributions as well as the coefficient of heat flux and the shearing stress at the plate are determined for different values of the Hall parameter m, the temperature ratio parameter θ w , the thermal conductivity parameter S , the viscosity-temperature parameter θ r , the magnetic field M , and the radiation parameter N .

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Couette Flow Problem for an Unsteady MHD Fourth Grade Fluid with Hall Currents

Couette Flow Problem for an Unsteady MHD Fourth Grade Fluid with Hall Currents

In this work, we analyze Couette flow problem for an unsteady magnetohydrodynamic (MHD) fourth-grade fluid in presence of pressure gradient and Hall currents. The existing literature on the topic shows that the effect of Hall current on Couette flow of an unsteady MHD fourth-grade fluid with pressure gradient has not been investigated so far. The arising non-linear problem is solved by the homotopy analysis method (HAM) and the convergence of the obtained complex series so- lution is carefully analyzed. The influence of pressure number, Hartmann number, Hall parameter and fourth-grade material parameters on the unsteady velocity is discussed through plots and on local skin-friction coefficient discussed through numerical values presented in tabular form.

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Effects Of Hall Currents And Variable Fluid Properties On Mhd Flow Past  Stretching Vertical Plate

Effects Of Hall Currents And Variable Fluid Properties On Mhd Flow Past Stretching Vertical Plate

The effects of Hall currents on free-convective steady laminar flow of fluid of variable properties, along a semi-infinite vertical plate for large temperature differences, in the presence of Hall current has been investigated. The fluid density is vary exponentially and the thermal conducting linearly with temperature, while the fluid viscosity is vary as a reciprocal of a linear function of temperature. The usual Boussinesq approximation is neglected. The sysem of nonlinear equations governing the problem under consideration transformed into non-similar partial differential equations which have been solved numerically by the forth-order Runge-Kutta method. The effects of the magnetic parameter M, the Hall parameter m, the density / temperature parameter n, the thermal conductivity parameter S, the viscosity temperature  r , and the temperature ratio parameter  w on the velocity and temperature distribution as well as the coefficient of heat flux and shearing stress at the plate are investigated.

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Entropy Generation in MHD Free Convective Boundary Layer Flow Past an Inclined Flat Plate Embedded in a Porous Medium with Hall Currents

Entropy Generation in MHD Free Convective Boundary Layer Flow Past an Inclined Flat Plate Embedded in a Porous Medium with Hall Currents

In an ionized gas where the density is low and/or the magnetic field is very strong, the conductivity normal to the magnetic field is reduced due to the free spiraling of electrons and ions about the magnetic lines of force before suffering collisions and a current is induced in a direction normal to both the electric and magnetic fields. This phenomenon, well known in the literature, is called the Hall effect. The study of magnetohydrodynamic viscous flows with Hall currents has important engineering applications in problems of magnetohydrodynamic generators, Hall accelerators as well as in flight magnetohydrodynamics. The magnetohydrodynamic natural convective boundary layer flow of an electrically conducting fluid along an inclined flat plate is of considerable interest in the technical field due to its frequent occurrence in

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Combined Effect of Hall Current and Rotation on MHDmixed Convection Oscillating Flow in a Rotating Vertical Channel

Combined Effect of Hall Current and Rotation on MHDmixed Convection Oscillating Flow in a Rotating Vertical Channel

Combined effects of Hall currents and rotation on MHD mixed convection in a rotating vertical channel have been studied. The governing equations are solved analytically in closed form. The effects of the various parameters on the velocity field, shear stresses, temperature field and the rate of heat transfer in terms of their amplitudes and tangent of phases are presented graphically. It is observed that the primary velocity decreases while the magnitude of the secondary velocity increases with an increase in Hall parameter parameter. It is also observed that both the primary velocity and the magnitude of the secondary velocity decrease with an increase in radiation parameter. Further, it is seen that the amplitudes of rate of heat transfer at the plates increases with an increase in either Prandtl number or radiation parameter or frequency parameter.

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On a new numerical analysis of the Hall effect on MHD flow and heat transfer over an unsteady stretching permeable surface in the presence of thermal radiation and heat source/sink

On a new numerical analysis of the Hall effect on MHD flow and heat transfer over an unsteady stretching permeable surface in the presence of thermal radiation and heat source/sink

Theoretical studies of magnetohydrodynamic flow and heat transfer over stretching sur- faces have received great attention by virtue of their numerous applications in the fields of metallurgy and chemical engineering. Such applications include geothermal reservoirs, wire and fiber coating, food stuff processing, reactor fluidization, enhanced oil recovery, packed bed catalytic reactors and cooling of nuclear reactors. The primary aim in extru- sion is to maintain the quality of the surface of the extricate. When the magnetic strength is strong, Hall currents cannot be neglected. In an ionized gas where the density is low and/or the magnetic field is very strong, the conductivity normal to the magnetic field is reduced due to the free spiraling of electrons and ions about the magnetic lines of force before suffering collisions, and a current is induced in a direction normal to both elec- tric and magnetic fields. Due to Hall currents, the electrical conductivity of the fluid be- comes anisotropic and this causes the secondary flow. The Hall effect is important when the Hall parameter, which is the ratio between the electron-cyclotron frequency and the electron-atom-collision frequency, is high. Hall currents are of great importance in many

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Generation of ELF waves during HF heating of the ionosphere at midlatitudes

Generation of ELF waves during HF heating of the ionosphere at midlatitudes

The excitation and propagation of ELF waves in the midlatitude ionosphere and magnetosphere during HF heating are simulated using a MHD model. The simulation model uses a realistic pro fi le of ionospheric plasma, along with the Earth ’ s magnetic dipole fi eld. The latter is an important element in the modeling of the midlatude ionosphere because of the geometrical effects in wave propagation. The simulation results show direct generation of EMIC waves at the source region as well as mode conversion of magnetosonic waves through the excitation of Hall currents in the E region. The waves are generated at the modulation fre- quency of the HF radio waves by the ionospheric current drive, which does not involve a quasi-steady current in the ionosphere, viz., an electrojet current [Papadopoulos et al., 2011a, Sharma et al., 2016]. This mechanism of wave generation was found to be effective in the F region ionosphere in the high latitudes, with the auroral electrojet in the D/E region. In the midlatitudes with no quasi-steady current system, this mechanism is expected to be a dominant process for exciting ELF waves. The results are thus directly relevant for the heating experiments with the Arecibo facility, which have been commissioned recently.

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The Effect of Hall-Currents on MHD Flow Over an Oscillating Vertical Plate in a Rotating System

The Effect of Hall-Currents on MHD Flow Over an Oscillating Vertical Plate in a Rotating System

http://www.ijmr.net.in email id- irjmss@gmail.com Page 576 medium with Hall current, such as Agarwal et al. [1] analysed the combined influence of dissipation and Hall effect on free convective flow in a rotating fluid and they analysed that the primary shear stress increases and secondary shear stress decrease with increase in magnetic and hall parameters. Also, Mazumdar et al. [8] studied the hydrodynamic study flow with the effect of Hall current. The present study is carried out to examine the effects of Hall currents and rotation on an unsteady convective flow of a viscous, incompressible and electrically conducting fluid past a vertical oscillatory plate in a porous medium under the influence of transversely applied uniform magnetic. The problem is solved analytically using the Laplace Transform technique. A selected set of graphical results illustrating the effects of various parameters involved in the problem is presented and discussed. The numerical values of skin-friction have been tabulated.

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The Linen Hall Library

The Linen Hall Library

The Society moved around Belfast from various taverns, to Robert Cary’s house, and premises in Ann Street, before settling in the White Linen Hall in 1802. And there it remained until 1888 when the Countess of Shaftesbury stated her intention ‘to render void the leases granted by her predecessors in respect of the White Hall and the surrounding grounds’. Vacant possession of the Hall was inevitable and new premises had to be secured. The new premises were a block of buildings at the corner of Donegall Square North and Fountain Street, a former linen warehouse, and, from 1892, where the library has been housed until the present day. The White Linen Hall is now the site of Belfast City Hall and there are excellent views of it from the windows of the Library.

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A Simple Pattern Recognition Approach for Monitoring Incipient Stator Faults in Salient-Pole Synchronous Generators

A Simple Pattern Recognition Approach for Monitoring Incipient Stator Faults in Salient-Pole Synchronous Generators

One characteristic of all those techniques is their complexity and time consuming. Hence, it is in this context that some detection and diagnosis methodologies as those shown in [6] and [7], generally used in the induction machines for stator faults, can be adapted to salient-pole synchronous generators. These methodologies use the inverse phase voltage component that is induced in the stator coils due to an incipient stator fault on salient-pole synchronous machines. In this paper, the authors propose some electrical features that can be used as indicators of stator faults well before their defects have a significant advance. The negative sequence component of stator voltages and currents are then used as inputs to the pattern recognition algorithm. Experimental results are presented and allow verifying the good performance applicability of the adapted methodology to detect incipient stator faults in synchronous generators.

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Intervention Retrofitting and Rehabilitation of Al Gawhara Palace at the Saladin Citadel, Cairo, Egypt

Intervention Retrofitting and Rehabilitation of Al Gawhara Palace at the Saladin Citadel, Cairo, Egypt

at both ends of which leads to an open courtyard in the middle of the buildings of the guest houses and the palace bathroom. The western door leads to an open courtyard in the middle of the throne room. The middle of the northern rib of these vertices, we find an ascending staircase that ends with a door opening leading to a rectangular hall. On the right and left of the stairs are two oval win- dows, which are decorated with glass with gilt-like curtains. The ceiling of the stairway is in the shape of a non-embossed letter and decorated with geometric areas and ribbons. Varying degrees, large parts of the sea wing have been de- stroyed for reception [9] [10].

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Hall $15.00 (SMCC

Hall $15.00 (SMCC

The new 31,592 square foot men’s residence hall at Southwest Mississippi Community College is named after longtime college trustees Hollis Alford and Jerry Conerly, Alford, from Pike County, and Conerly, of Walthall County. Alford served 52 years and Conerly served 51 years on the Southwest Board of Trustees and have held positions of both chair- man and vice-chairman for a majority of that time. “They’ve committed a lot of time to Southwest Mississippi Community College, and they’ve been dedicated to the college,” President Dr. Steve Bishop said. Alford-Conerly is a two-story residence hall with the capacity to house 122 students in its 61 dormitory-style rooms. The approximately $6.5 million proj- ect located behind the Baptist Student Union opened for move- in this September, and its resi- dents have been more than happy with their new home. Southwest Mississippi Community College has equipped its new campus housing with state-of-the-art technology such as Wi-Fi that spans throughout the entire building, a security surveillance system, and an electronic card reader access point at the entrance. With amenities includ- ing an elevator, vending machines, keycard locks on each door, study rooms, cable, laundry rooms, and more, the men are experiencing campus living like never before. The new residence hall has changed the campus for the better, and it will accommo- date incoming residents in style and comfort for years to come.

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Sheldon-Hall syndrome

Sheldon-Hall syndrome

Sheldon-Hall syndrome (SHS) is a rare multiple congenital contracture syndrome characterized by contractures of the distal joints of the limbs, triangular face, downslanting palpebral fissures, small mouth, and high arched palate. Epidemiological data for the prevalence of SHS are not available, but less than 100 cases have been reported in the literature. Other common clinical features of SHS include prominent nasolabial folds, high arched palate, attached earlobes, mild cervical webbing, short stature, severe camptodactyly, ulnar deviation, and vertical talus and/or talipes equinovarus. Typically, the contractures are most severe at birth and non-progressive. SHS is inherited in an autosomal dominant pattern but about half the cases are sporadic. Mutations in either MYH3, TNNI2, or TNNT3 have been found in about 50% of cases. These genes encode proteins of the contractile apparatus of fast twitch skeletal muscle fibers. The diagnosis of SHS is based on clinical criteria. Mutation analysis is useful to distinguish SHS from arthrogryposis syndromes with similar features (e.g. distal arthrogryposis 1 and Freeman-Sheldon syndrome). Prenatal diagnosis by ultrasonography is feasible at 18–24 weeks of gestation. If the family history is positive and the mutation is known in the family, prenatal molecular genetic diagnosis is possible. There is no specific therapy for SHS. However, patients benefit from early intervention with occupational and physical therapy, serial casting, and/or surgery. Life expectancy and cognitive abilities are normal.

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Induced Currents in Pipelines

Induced Currents in Pipelines

Changes in the geomagnetic field produce ground induced currents that can have impacts on ar- tificial systems such as pipelines. According to these, geomagnetic perturbations observed during June 2005 are studied. The data measured on the Ottawa River Valley pipeline verify the appear- ance of induced currents greater than 700 mA and additional potential values larger than −850 V that can produce additional corrosive effects.

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A survey of submesoscale currents

A survey of submesoscale currents

Submesoscale currents are pervasive throughout the ocean. They have intermediate space and time scales—neither mesoscale nor microscale—that have made them elusive for measurements and modeling until recently. In this brief article, a survey is presented of their primary characteristics and interpretive explanations, intended for a broad audience of physical and biogeochemical oceanographers. Besides their identifying scales, submesoscale currents are distinctive in their flow patterns, their essential dynamical processes, and their consequences for transport, mixing, and dissipation in the general circulation. There are two primary submesoscale populations, a frontal one in the near- surface layer with its typically reduced stratification, and another vortical one, generated in topographic wakes, that (sparsely) fills the oceanic interior.

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COMPARATIVE ANALYSIS AND SIMULATION OF INTEGRATED HALL ELEMENTS FORMED IN CMOS-TECHNOLOGY

COMPARATIVE ANALYSIS AND SIMULATION OF INTEGRATED HALL ELEMENTS FORMED IN CMOS-TECHNOLOGY

Magnetic field-effect circuits with linear output where the Hall voltage is measured proportionally to the magnetic field induction are used to measure quite small magnetic field variations. As a rule, these circuits have a sensor amplifier. When no external magnetic field exists, the output voltage of a linear magnetic field-effect circuit taken for the reference level and usually equal to half of the supply voltage. When registering the positive direction of the magnetic field the output voltage is above the reference level, when registering the negative direction it is lower, although it remains a positive value [1].

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Survey Paper on a Web Based Hall Booking Management System

Survey Paper on a Web Based Hall Booking Management System

Abstract: a web base hall booking management system provides the searching facilities based various factor. Web base hall booking management systems are going to develop web portal for searching wedding halls. This web portable is use to check the availability of wedding hence we need not go and visit the place. The user should have wasted his / her time and the money to search for hall. Information of individual’s hall is stored in database. New owner of hall can insert his details in web portal. As he becomes member of web portal he can edit his information and update date of booking.

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Scaling laws in Hall inertial range turbulence

Scaling laws in Hall inertial range turbulence

Based on these observations, we consider in the fol- lowing a phenomenological turbulence model of stationary inertial-range spectra evolving in ion-scale turbulence. We will show that, qualitatively, such a model reproduces ion- inertial-range spectra measured by the MMS spacecraft in the vicinity of the magnetopause (Stawarz et al., 2016), when- ever the Kelvin–Helmholtz instability is excited and decays into smaller-scale Kelvin–Helmholtz vortices until a spec- trum of low-frequency small-scale turbulence is produced. We consider a two-dimensional geometry which has no par- allel wave vector component. The full expression for the Hall electric field contains also parallel wave vector components (Treumann et al., 2019) which in Hall MHD are neglected.

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