Download PDF by V. Polunin: Acoustics of nanodispersed magnetic fluids

By V. Polunin

ISBN-10: 1161161341

ISBN-13: 9781161161342

ISBN-10: 149873393X

ISBN-13: 9781498733939

ISBN-10: 1498733948

ISBN-13: 9781498733946

Acoustics of Nanodispersed Magnetic Fluids presents key details at the acoustic houses of magnetic fluids. The ebook is predicated on study conducted by way of the writer in addition to on many courses in either the Russian and overseas clinical literature from 1969 onwards.

It describes a wide selection of subject matters, which jointly lay the basis of a brand new clinical examine sector: the acoustics of nanodispersed media. The e-book examines the nanoscale constitution of topic in particular components and discusses the following:

  • Model idea and identified good points of the propagation of sound waves in magnetised fluids
  • Acoustomagnetic and magnetoacoustic results in magnetic fluids
  • Acoustomagnetic spectroscopy of vibrational modes within the liquid-shell system
  • Vibration and rheological results of magnetised magnetic fluids
  • Acoustometry of the form of magnetic nanoaggregates and non-magnetic microaggregates
  • Acoustogranulometry, a brand new technique for learning the actual houses of magnetic nanoparticles dispersed in a provider fluid

The ebook is a precious source for engineers and researchers within the fields of acoustics, actual acoustics, magnetic hydrodynamics, and rheology physics. The experimental equipment, that are defined during this publication, are in line with incompatible gains of magnetic fluids, i.e. powerful magnetism, fluidity and compressibility. accordingly, this may locate business program in complicated know-how. it's also beneficial for either complex undergraduate and graduate scholars learning nanotechnology, fabrics technology, actual and utilized acoustics.

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Additional info for Acoustics of nanodispersed magnetic fluids

Example text

The data presented in Fig. 6 show that within the limits of the measurement error, the curves of the direct and reversed course are identical. The results obtained on the basis of the ballistic method and the weighing method indicate the complete absence in the investigated MF sample of the remanent magnetisation in the range of the strength of the outer magnetising field from 0 to 75 kA/m. In this respect, the magnetically treat is regarded as an ideal magnetically soft material. Within the framework of these considerations, the absence of any manifestation of the magnetic hysteresis in the magnetic fluid in the static measurement conditions is explained by the short relaxation time of rotational diffusion of the magnetic moment of the magnetic particles of the single-domain dimensions, suspended in the liquid and carrying out thermal Brownian motion.

As regards the sufficiently high stability of the suspension and the magnetic fluid, the above shortcomings are not experienced in the variant of the weighing method in which a relatively short cylindrical specimen is placed in the region of the magnetising field with a small field strength gradient. Consequently, at a minimum difference of the average and local characteristics, it is quite easy to take into account the demagnetising factor and calculate the values of the strength of the field ‘in the substance’, H i.

9) we obtain δM = − nM n + γ * M T + iωτ1M 0 ∂u ⋅ . 1 + M H + iωτ1 ∂x Denoting τ ≡ τ 1 (1 + M H) −1, we obtain (nM n + γ *M T ) / (1 + M H ) + iωτM 0 ∂u ⋅ . 8) can be used when there is no slipping of the particles in relation to the liquid matrix. For the relatively large particles, for δM = − 48 Acoustics of Nanodispersed Magnetic Fluids example, in a ferrosuspension (FS), this condition is fulfilled only approximately.

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Acoustics of nanodispersed magnetic fluids by V. Polunin

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