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This course provides a unified and detailed overview on the theory and characterization of disperse systems (powders and mainly suspensions) and heterogeneous materials (single-phase polycrystalline materials, multiphase, mainly two-phase, composites, and porous materials). The theoretical framework of this course is neoclassical continuum theory (so-called rational thermomechanics), classical electromagnetic field theory and the theory of multiphase mixtures or composites (so-called micromechanics). The first part of this course focusses on ensemble methods for the characterization of particle systems, mainly methods based on light scattering, and on methods for the characterization of microstructures via stereological relations. Then, after introducing the basic constitutive equations, the effective properties of disperse systems and hetergeneous materials are discussed, i.e. the viscosity of suspensions, the thermal conductivity of nanofluids, the elastic, thermal, thermoelastic and other properties of heterogeneous materials (single-phase polycrystalline, including nanocrystalline, and multiphase, mainly two-phase materials, including porous materials) are treated, with a special focus on rigorous bounds and predictive model relations (effective medium approximations). The course closes with brief outlooks on percolation theory, fluid flow in porous media, effective electric, magnetic and electromagnetic (optical) properties, including classical scattering theory (Mie theory), with which the course de facto starts and thus the circle closes.
Last update: Pátková Vlasta (19.11.2018)
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The students will be able to (of course depending on the individual students‘ abilities to digest the matter offered in this course) 1. assign the models of disperse systems and heterogeneous materials into the corresponding framework theory (classical continuum theory, non-classical continuum theory, mixture theory etc.) and take full benefit from theories of micromechanics and scattering, 2. characterize disperse systems and the microstructure of heterogeneous materials lege artis and apply this ability in his or her own publications, critically assess the models of disperse systems and heterogeneous materials published so far and distinguish scientific folklore from physically admissible models, 3. become aware of, critically assess and scrutinize the common practice of many current authors to confuse curve fitting with predcitive modeling, and on this basis rethink the whole problem and its consequences and achieve a firm standpoint for his or her own scientific work, 4. devolep new models or adapt existing models describing the relationship between the microstructure and properties of disperse systems and heterogeneous materials and apply these models in his or her own scientific work. Last update: Pátková Vlasta (19.11.2018)
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Oral exam. Last update: Pátková Vlasta (19.11.2018)
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Recommended:
Optional:
Last update: Pabst Willi (12.08.2024)
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Lectures (if more than 2 students) or consultation and self-study. Last update: Pátková Vlasta (19.11.2018)
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none Last update: Pátková Vlasta (19.11.2018)
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1. Size and shape characterization of particles and particle systems (including anisometric particles) - from sedimentation to light scattering methods
2. Microstructural characterization of heterogeneous materials (including anisotropic microstructures) - from Archimedes to stereology-based image analysis
3. Stereology I: Volume fractions, porosity, interface density, mean curvature integral density, mean chord length and other size measures
4. Stereology II: Unfolding of size distributions using transformations based on Volterra-type integral equations, correlation functions
5. Rational mechanics of viscous fluids and elastic solids
6. Suspension rheology: Effective viscosity of dilute or concentrated suspensions with spherical or non-spherical particles
7. Linear theory of thermoelasticity (solids) and thermoviscosity (fluids)
8. Nanofluids: Effective viscosity and thermal conductivity
9. Effective properties of polycrystalline and nanocrystalline materials
10. Effective elastic properties and thermal conductivity of composites and porous solids I: Rigorous bounds, dilute and self-consistent approximations
11. Effective elastic properties and thermal conductivity of composites and porous solids II: Differential approximations, cluster expansions and other nonlinear models
12. Percolation theory and fluid flow in porous media
13. Effective electric, magnetic and electromagnetic (optical) properties
14. Classical theory of scattering (Mie theory and its approximations) Last update: Pátková Vlasta (19.11.2018)
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Publications of the lecturer according to the list of literature references (available at the National Technical Library or directly from the lecturer). Last update: Pátková Vlasta (19.11.2018)
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none Last update: Pátková Vlasta (19.11.2018)
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none Last update: Pátková Vlasta (19.11.2018)
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