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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2004, Volume 80, Issue 6, Pages 464–467
(Mi jetpl2123)
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This article is cited in 20 scientific papers (total in 20 papers)
CONDENSED MATTER
Impurity transport in percolation media
A. M. Dykhne, P. S. Kondratenko, L. V. Matveev Nuclear Safety Institute, RAS
Abstract:
An equation describing the impurity transport in a percolation medium is obtained and the inferences drawn from this equation are analyzed based on the scale invariance concept. A determining part in this analysis is allowance for the sinks inherent in such media. At distances shorter than the correlation length, the particles are transferred in the regime of subdiffusion; at large distances, the concentration asymptotics exhibits a characteristic “tail” shape. In the medium occurring in the state above the percolation threshold, the impurity transport over time periods longer than the characteristic time related to the correlation length is well described by the classical equation with a renormalized diffusion coefficient. In this case, the concentration tail has a Gaussian shape at moderate distances and tends to subdiffusion asymptotics at very long distances. A relation is established between the factor determining renormalization of the diffusion coefficient and the factor determining a decrease in the number of active impurity particles at large times.
Received: 30.07.2004
Citation:
A. M. Dykhne, P. S. Kondratenko, L. V. Matveev, “Impurity transport in percolation media”, Pis'ma v Zh. Èksper. Teoret. Fiz., 80:6 (2004), 464–467; JETP Letters, 80:6 (2004), 410–412
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https://www.mathnet.ru/eng/jetpl2123 https://www.mathnet.ru/eng/jetpl/v80/i6/p464
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Abstract page: | 317 | Full-text PDF : | 97 | References: | 54 |
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