Diffusion of oriented particles in porous media |
| |
Authors: | René Haber Janett Prehl Heiko Herrmann Karl Heinz Hoffmann |
| |
Institution: | 1. Institut für Physik, Technische Universität Chemnitz, D-09107 Chemnitz, Germany;2. Centre for Nonlinear Studies, Institute of Cybernetics at Tallinn University of Technology, Akadeemia tee 21, 12618 Tallinn, Estonia |
| |
Abstract: | Diffusion of particles in porous media often shows subdiffusive behavior. Here, we analyze the dynamics of particles exhibiting an orientation. The features we focus on are geometrical restrictions and the dynamical consequences of the interactions between the local surrounding structure and the particle orientation. This interaction can lead to particles getting temporarily stuck in parts of the structure. Modeling this interaction by a particular random walk dynamics on fractal structures we find that the random walk dimension is not affected while the diffusion constant shows a variety of interesting and surprising features. |
| |
Keywords: | Anomalous diffusion Random walks Oriented random walks Porous media Sierpinski carpets |
本文献已被 ScienceDirect 等数据库收录! |