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.