Kollisionsk├╝hlung in elektrisch geladener granularer Materie

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Particles in granular systems collide inelasticly and kinetic energy is dissipated in the granular system. Granular temperature measures the unordered relative motion of the particles. As a result of the inelastic collisions granular temperature decreases, this process is called collisional cooling. In most cases granular particles are charged. This thesis studies the influence of electrical charges on the collisional cooling by using computer simulations and kinetic theory. It is shown, that electrical charge modifies the dissipation rate by a Boltzmann-factor. The energy barrier of the Boltzmann-factor is given by the electrostatic interaction of two colliding particles. In dense systems this energy barrier is reduced due to the interactions with the particles, that do not take part in the collision. A quantitative expression is given for the effective reduction of the energy barrier. The results found for homogeneous systems is expanded for the local description of inhomogeneous systems.
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Dokumententyp:
Wissenschaftliche Abschlussarbeiten » Dissertation
Fakultät / Institut:
Fakultät für Physik
Dewey Dezimal-Klassifikation:
500 Naturwissenschaften und Mathematik » 530 Physik
Stichwörter:
dissipation, kinetic theory, molecular dynamics, computer simulation, contact electrification, collisional cooling, Electrical charged granular media
Beitragender:
Prof. Dr. rer. nat. Wolf, Dietrich E. [Gutachter(in), Rezensent(in)]
Sprache:
Deutsch
Kollektion / Status:
Dissertationen / Dokument veröffentlicht
Datum der Promotion:
26.06.2000
Dokument erstellt am:
26.06.2000
Dateien geändert am:
03.04.2007
Medientyp:
Text