Polunin Acoustics of Nanodispersed Magnetic Fluids

Erscheinungsjahr 2015
ISBN: 978-1-4987-3394-6
Verlag: CRC Press
Format: PDF
Kopierschutz: Adobe DRM (»Systemvoraussetzungen)

E-Book, Englisch, 472 Seiten

Acoustics of Nanodispersed Magnetic Fluids presents key information on the acoustic properties of magnetic fluids. The book is based on research carried out by the author as well as on many publications in both the Russian and foreign scientific literature from 1969 onwards.

It describes a wide variety of topics, which together lay the foundation of a new scientific research area: the acoustics of nanodispersed media. The book examines the nanoscale structure of matter in specific areas and discusses the following:

- Model theory and known features of the propagation of sound waves in magnetised fluids

- Acoustomagnetic and magnetoacoustic effects in magnetic fluids

- Acoustomagnetic spectroscopy of vibrational modes in the liquid-shell system

- Vibration and rheological effects of magnetised magnetic fluids

- Acoustometry of the shape of magnetic nanoaggregates and non-magnetic microaggregates

- Acoustogranulometry, a new method for studying the physical properties of magnetic nanoparticles dispersed in a carrier fluid

The book is a valuable resource for engineers and researchers in the fields of acoustics, physical acoustics, magnetic hydrodynamics, and rheology physics. The experimental methods, which are described in this book, are based on incompatible features of magnetic fluids, i.e. strong magnetism, fluidity and compressibility. As a result, this can find industrial application in advanced technology. It is also useful for both advanced undergraduate and graduate students studying nanotechnology, materials science, physical and applied acoustics.

Autoren/Hrsg.

Polunin, V.

Fachgebiete

• Technische Wissenschaften Maschinenbau | Werkstoffkunde Technische Mechanik | Werkstoffkunde
• Naturwissenschaften Chemie Physikalische Chemie
• Naturwissenschaften Physik Physik Allgemein

Inhaltsverzeichnis

Equilibrium Magnetisation of Magnetic Fluids
General Information on Magnetic Fluids
The Equation of the Magnetic State

The Method of Measurement of the Magnetic Parameters of Magnetic Fluids and Ferrosuspensions

Comparison of Equilibrium Magnetisation of Magnetic Fluid and Ferrosuspension

Magnetisation of the Specimen in Quasi Static Deformation

Dynamic Deformation of the Magnetised Specimen

Perturbation of Magnetic Induction By Sound

Perturbation of Magnetisation of the Magnetic Fluid By Sound

Elastic Oscillations of the Magnetic Fluid Cylinder at the Basic Frequency

Acoustomagnetic Effect

Method for the Experimental Investigation of the Acoustomagnetic Effect

Experimental Results and Analysis

Dependence of the Amplitude of the Acoustomagnetic Effect on Frequency Along the Length of the Magnetic Fluid Cylinder

Identification of Oscillation Modes

Speed of Sound

The Additive Model of Elasticity

Method for Measuring the Speed of Sound

Results of Measurement of the Speed of Sound in Non-Magnetised Magnetic Fluids

Temperature Dependence of the Speed of Sound

Temperature Dependence of Adiabatic Compressibility

The Non-Linearity Parameter

Dispersion of the Speed of Sound in an Unlimited Magnetic Fluid
Effect of the Magnetic Field on the Speed of Sound
Mechanisms of the Field Dependence of the Speed of Sound

Absorption and Scattering of Sound
The Mechanisms of Adsorption of Sound Waves
Acoustic Scattering
The Method For Measuring the Absorption Coefficient

Discussion of the Experimental Results. Non-Magnetised Fluid

Discussion of the Experimental Results. The Magnetised Fluid

Some Special Features of the Passage of Ultrasound Through a Ferrosuspension

Optimisation of the Acoustic Parameters of Magnetic Fluids and Ferrosuspensions

Ponderomotive Mechanism of Electromagnetic Excitation of Sound

Magnetoacoustic Effect in the Kilohertz Frequency Range
Cylindrical Magnetic Fluid Resonator

The Flat Magnetic Fluid Source of Sound Oscillations

Resonance Excitation of Sound in an Unlimited Magnetic Fluid

Oscillations of the Form of the Magnetic Fluid Droplet

Oscillations of the Magnetic Fluid Chain

Magnetic Fluid Chain With the Elasticity of the Ponderomotive Type

The Mechanism of Formation of Sound Oscillations in an Air Resonator

Magnetoacoustic Effect in the Megahertz Frequency Range
Experimental Equipment for Investigating the Magnetoelastic Effect
in the Megahertz Frequency Range

The Method of Absolute Measurements of the Oscillation Amplitude
Measurement Results

Failure of the Ponderomotive Mechanism

The Mechanism of Linear Magnetostriction

The Mechanism of Bulk Magnetostriction
Magnetocalorific Effect As A Possible Mechanism of Excitation Of
Elastic Oscillations
Other Possible Mechanisms

Magnetic Fluid Compacting As An Oscillatory System

The Magnetic Fluid Membrane

Elastic and Electrodynamic Properties of the Magnetic Fluid Membrane
Non-Linear Oscillations of A Thin Magnetic Fluid Bridge
The Kinetic Properties of the Magnetic Fluid Membrane
Comparison of Two Methods of Measuring the Critical Pressure Drop
Investigation of the Kinetic–Strength Properties of the Magnetic Fluid Membrane by the Optical Method

Acoustomagnetic Spectroscopy
Dispersion of the Speed of Sound in the Fluid – Cylindrical Shell System
Description of the Problem
The Experimental Technique Based on the AME
Some of Special Features of the Study of Oscillation Modes

On the Influence of Inhomogeneity of the Magnetic Field

Experimental Results and Analysis

Acoustic Granulometry

Prologue

Mechanism of Perturbation of Magnetisation in the Magnetic Field Transverse to the Soundwave

Calculation of the Dynamic Demagnetising Factor

Magnetic Granulometry

Acoustic Granulometry of Magnetic Nanoparticles

The Size Distribution of Magnetic Nanoparticles
Motivation of Studies of the ‘Solid-State’ Mechanism of Magnetisation of the Magnetic Fluid

Calculated Value of the Magnetic Moment of the Nanoparticles and the Dynamic Demagnetising

Factor From the Data For Highly Concentrated Magnetic Fluids
Mechanism of Thermal Relaxation of Magnetisation of Magnetic Fluid

Acoustometry of the Shape of Magnetic Nanoaggregates and Non-Magnetic Microaggregates
Column of the Magnetic Fluid in the Tube As the Inertial–Viscous Element of the Oscillatory System
Vibration–Rheological Effect
On A ‘Non-Magnetic’ Dissipation Mechanism of the Energy of the Oscillatory System

Comparing the Findings of the Model Theory With Experiment

Rheology of Magnetic Fluid With Anisotropic Properties

Measurement Procedure

Results and Analysis

The Expansion of the Experimental Base Vibrorheology of MF on the Basis of the Magnetic Levitation Effect

Conclusions

Appendix

References

Index

Über Autor(innen)

Vyacheslav Mikhailovich Polunin has been working in the Physics Department of Southwest State University in Kursk (Russia) for 40 years: as a senior lecturer, reader, and currently heads the department. He earned his PhD in physics from the Leningrad State University in Saint Petersburg, Russia. Dr. Polunin’s research interests include molecular physics, physical acoustics, and magnetohydrodynamics. He is also the author or co-author of nearly 350 scientific publications in Russian national science journals and many European countries. Dr. Polunin holds 15 author’s certificates and patents.