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Saturday, July 11, 2020 | History

3 edition of Dynamical behavior of magnetic fields in a stratified, convecting fluid layer found in the catalog.

Dynamical behavior of magnetic fields in a stratified, convecting fluid layer

Steven R. Lantz

Dynamical behavior of magnetic fields in a stratified, convecting fluid layer

by Steven R. Lantz

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Published by Cornell Theory Center, Cornell University in Ithaca, N.Y .
Written in English

    Subjects:
  • Magnetic fields

  • Edition Notes

    StatementSteven Richard Lantz.
    SeriesCornell Theory Center technical report -- CTC91TR86., Technical report (Cornell Theory Center) -- 86.
    ContributionsCornell Theory Center.
    The Physical Object
    Paginationxiv, 228 p. :
    Number of Pages228
    ID Numbers
    Open LibraryOL16959113M

    for large stratification, velocity in this layer approaches a small value at the edge of the top Ekman layer, largely expunging the role of the Ekman layers. The experiment!Fig. 1. consisted of heating a rotating, stably stratified cylinder of fluid from above with a radially varying surface temperature distribution. The fluid . An investigation of magnetic fluid experiments and analysis is presented in three parts: a study of magnetic field induced torques in magnetorheological fluids, a characterization and quantitative measurement of properties relating to the transition of a ferrofluid drop from a continuous phase into a discrete phase and also into a spiral flow, and a study of magnetic field induced ferrofluid.

    Our simulations indicate that these turbulent compressible flows can drive a small-scale dynamo but, even when the layer is rotating very rapidly (with a mid-layer Taylor number of Ta=10^8), we find no evidence for the generation of a significant large-scale component of the magnetic field on a dynamical . Electromagnetism - Electromagnetism - Magnetic fields and forces: The magnetic force influences only those charges that are already in motion. It is transmitted by the magnetic field. Both magnetic fields and magnetic forces are more complicated than electric fields and electric forces. The magnetic field does not point along the direction of the source of the field; instead, it points in a.

    Figure 1. Measuring cell in crossed magnetic fields. The black cylinder is the test tube containing magnetic fluid, the light cylinder is the measuring coil. (A) The low frequency limit; (B) the arbitrary frequencies. VLQ NS a H M M E tt HMHH µ § = ¨¸ + ©¹, (2) where M = MH. Equation (2) is applicable to any magnetic fluid, including. Kitengeso et al. - Effects of magnetic fields on a boundary layer flow of a conducting fluid forces affect the velocity within the boundary layer. The study of mutual interaction between magnetic fields and flow of electrically conducting fluids such as liquid metals, ionized gas and salt water (strong.


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Dynamical behavior of magnetic fields in a stratified, convecting fluid layer by Steven R. Lantz Download PDF EPUB FB2

Magnetic buoyancy is thought to play an important role in the dynamical behavior of the Sun's magnetic field in the convection zone. Magnetic buoyancy is commonly thought to cause inescapable rapid loss of toroidal flux from much of the convection zone, thereby suppressing effective operation of a solar dynamo.

This paper re-examines the detailed character of magnetic buoyancy, Author: S. Vainshtein, E. Levy. We further compare a subsequent simplification introduced by Lantz [Dynamical behavior of magnetic fields in a stratified, convecting fluid layer.

Ph.D. Thesis, Cornell University: Ithaca, U.S.A. The magnetic fluid properties are affected by a magnetic field. Our goal also have been to determine eventually the dependence of viscosity and surface tension on the magnetic fields, the type of the flow patterns and structures generated by the interface and free surface dynamics, the types of flow features affected or otherwise by the.

The problem consists of an infinite electrically conductive fluid layer with magnetic field applied on the heated side which is subject to stress-free boundary conditions on the horizontal boundaries has been investigated.

It is observed that magnetic field strength decreases the intensity of the convective flow and causes a change of the flow Cited by: The effect of magnetic field dependent (MFD) viscosity on thermal convection in a horizontal ferromagnetic fluid layer has been investigated numerically.

A correction is applied to Sunil et al. [24] which is very important in order to predict the correct behavior of MFD viscosity. Linear stability analysis has been carried out for stationary convection.

It is known that Earth's magnetic field is produced by convection currents of an electrically conducting iron-nickel alloyin the liquid core, about 3, kilometers below Earth's surface. Thermal convection in magnetic fluids can be driven by buoyancy or by magnetic forces (due to the thermomagnetic effect).

Depending on the direction of the applied temperature gradient, buoyancy effects can be stabilizing (heating from above) or destabilizing (heating from below), whereas the magnetic forces always play a destabilizing role for magnetic fields perpendicular to the interface.

The concern of [9]Makinde was the inherent irreversibility in hydro magnetic boundary layer flow of variable viscosity fluid over a semi-infinite flat plate under the influence of thermal radiation and Newtonian heating.

In the study carried out by Reddy et al.[12] on MHD boundary layer flow of a non-newtonian power-law fluid on a. The linear instability is investigated for a horizontal magnetic fluid layer confined between two ferromagnetic boundaries and heated from below in the presence of a vertical magnetic field.

Galerkin method is used for solving the disturbance equations. The resultant eigenvalue problem is solved numerically. The critical Rayleigh number varies with the magnetic number, N, as R a c =(1- N. Magnetic fluids are superparamagnetic materials that have recently been the subject of extensive research because of their unique properties.

Among them is the heating effect when exposed to an alternating magnetic field, wherein the objective is to use this property in medicine as an alternative method for the treatment of tumors in the body. If the fluid is sufficiently deep, another salt finger layer forms below the well-mixed layer.

Within a range of values of the controlling parameters, reflecting, in particular, small negative Ra and deepwater, the instability takes the form of a number of convecting layers bounded above and below by comparatively thin salt finger layers.

System Upgrade on Fri, Jun 26th, at 5pm (ET) During this period, our website will be offline for less than an hour but the E-commerce and registration of new users may not be available for up to 4 hours. The static and dynamic behavior under magnetic elds of ferronematics obtained by adding an organomagnetic material to the nematic E3 is investigated.

First, by using both optical and electrical measurements, an increase of the threshold field for magnetic Freedericksz transition was noticed.

conductor, and hence the fluid flow is pushed off the channel walls until a balanced condition between the fluid pressure and the magnetic pressure is reached. Therefore a vacuous frozen layer in the vicinity of the applied magnetic field source is established, with an outer flow field stream free from the magnetic.

Responses of a magnetic fluid interface adsorbed on a small permanent magnet in water container subjected to an alternating magnetic field were studied with a high-speed video camera system. The directions of the external alternating magnetic field were parallel and anti-parallel to that of the permanent magnet.

It was found that the interface of water-magnetic fluid responds to the external. Earth’s magnetic field is generated by a feedback loop in the liquid outer core: Current loops generate magnetic fields; a changing magnetic field generates an electric field; and the electric and magnetic fields exert a force on the charges that are flowing in currents.

Nonlinear two-dimensional magnetoconvection in a Boussinesq fluid has been studied in a series of numerical experiments with values of the Chandrasekhar number Q ≤ and the ratio ζ of the magnetic to the thermal diffusivity in the range 1 ≥ ζ ≥ 0 If the imposed field is strong enough, convection sets in as overstable oscillations which give way to steady convection as the.

Characteristic behavior of magnetic fluid was investigated for a key technology study of the magnetic targeting drug delivery system, which is the specific delivery of chemotherapeutic agents to a desired location in the body, such as tumor by the control of an external magnetic field.

Transparent images of the fluid were taken by using a CCD camera and an intense X-ray beam at the SPring Planetary Magnetic Fields and Fluid Dynamos Chris A. Jones Department of Applied Mathematics, University of Leeds, Leeds LS2 9JT, United Kingdom; email: [email protected] Annu.

Rev. Fluid Mech. – First published online as a Review in Advance on Septem The Annual Review of Fluid Mechanics is online at.

Access to this book provides the broad perspective that both young and mature researchers entering these areas should possess, and the book would serve well also in graduate courses in astrophysical and geophysical fluid dynamics this is a lovely book that does justice to a double-diffusive system of very considerable interest.'.

of magnetic fluid in a strong magnetic field. First, the effect of uniform and nonuniform magnetic fields on steady pipe flow resistance is clarified.

Then the oscillatory pipe flow characteristics in the application of stationary and nonstationally magnetic fields are inves- tigated.

Finally gas-liquid two-phase flow in .Geomagnetic field - Geomagnetic field - Sources of the steady magnetic field: Observations of the magnetic field of Earth’s surface indicate that more than 90 percent of this field arises from sources internal to the planet.

A variety of mechanisms for generating this field have been proposed, but at present only the geomagnetic dynamo is seriously considered.Experimental studies of the behavior of magnetic fluid drop under the effect of an external alternating magnetic field were performed using a high speed digital video camera system.

A small permanent magnet was immersed in magnetic fluid drop, and it was fixed with an aluminum bar. The surface of magnetic fluid responded to the external magnetic field sensitively.