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Effective dynamic properties of random complex media with spherical particles.
M Mahbub Alam1, Valerie J Pinfield2, Francine Luppé1
1Laboratoire Ondes et Milieux Complexes, Unité Mixte de Recherche 6294, Centre National de la Recherche Scientifique, University of Le Havre, 76600 Le Havre, France.
The Journal of the Acoustical Society of America
|July 1, 2019
Summary
This study presents effective dynamic bulk modulus and density for particle-filled fluids using a core-shell model. Viscosity significantly impacts nanofluid properties, contrary to common assumptions.
Area of Science:
- Physics
- Materials Science
- Acoustics
Background:
- Effective medium theories are crucial for understanding composite materials.
- Nanofluids exhibit unique properties influenced by particle-fluid interactions.
- The role of host fluid viscosity in dynamic properties is often simplified or neglected.
Purpose of the Study:
- To determine the effective dynamic bulk modulus and density of random particle-host fluid composites.
- To incorporate the viscous nature of the host fluid into effective medium models.
- To investigate the significance of viscosity in nanofluid dynamic properties.
Main Methods:
- Utilized a core-shell, self-consistent effective medium model.
- Assumed large compressional wavelength conditions.
- Derived analytical expressions for effective properties, including wave mode conversion.
Main Results:
- Obtained analytical expressions for effective bulk modulus and mass density.
- Demonstrated that effective density depends on concentration, particle size, and host properties.
- Showcased the significant, often overlooked, role of viscosity in nanofluid effective properties.
Conclusions:
- The developed model accurately predicts effective properties for particle-laden viscous fluids.
- Viscosity is a critical factor influencing the dynamic behavior of nanofluids.
- Results are relevant for applications in acoustics, particle characterization, and resonant mixing.
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