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A new theory for anomalous diffusion with a bimodal flux distribution

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Abstract

This paper deals with a new governing equation for anomalous diffusion encompassing a large spectrum of phenomena with particular attention on delaying processes. The analysis starts with a discrete approach and a law of evolution introducing a partial retention of the diffusing particles at each time step. The resulting differential equation assuming that the concentration function belongs to class C3 is a fourth-order differential equation. To fit this result into the framework of a new theory, a bi-modal flux distribution for the diffusion process associated with two energy states is proposed. The first energy state is related to the set of particles flowing according to the Fick’s law and the complementary set follows a new law. Two key parameters are introduced, namely, a parameter β indicating the fraction of the particles in the principal energy state and a parameter R controlling the effect of the secondary flux. Some examples are presented characterizing different types of phenomena as function of the relative values of β and R. The necessary conditions for the retention behavior are discussed for some particular cases.

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Acknowledgments

The results presented in this paper could not be achieved without the support of the National Research Council (CNPq) through the Research Fellowship Program, and the Research Project : 480865/2009-4. We are also indebted with the State of Rio de Janeiro Foundation, Research project: E-26/101.728/2010, for the scholarship granted to one of the authors of this paper.

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Authors and Affiliations

  1. Instituto Alberto Coimbra, COPPE, Ilha do Fundão, Universidade Federal do Rio de Janeiro, C.P. 68506, Rio de Janeiro, RJ, 21945-970, Brazil

    L. Bevilacqua & Ana Paula Rio Doce

  2. Laboratório Nacional de Computação Científica, Av. Getúlio Vargas, 333, Quitandinha, Petrópolis, RJ, 25651-075, Brazil

    A. C. N. R. Galeão & J. G. Simas

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  1. L. Bevilacqua
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  2. A. C. N. R. Galeão
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  3. J. G. Simas
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  4. Ana Paula Rio Doce
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Correspondence to L. Bevilacqua.

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Technical Editor: Fernando Alves Rochinha.

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Bevilacqua, L., Galeão, A.C.N.R., Simas, J.G. et al. A new theory for anomalous diffusion with a bimodal flux distribution. J Braz. Soc. Mech. Sci. Eng. 35, 431–440 (2013). https://doi.org/10.1007/s40430-013-0041-y

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  • DOI: https://doi.org/10.1007/s40430-013-0041-y

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