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ENTROPY PRODUCTION OF ENTIRELY DIFFUSIONAL LAPLACIAN TRANSFER AND THE POSSIBLE ROLE OF FRAGMENTATION OF THE BOUNDARIES

Department of Physics, University of Athens, Panepistimiopolis, GR 15784, Athens, Greece

Complex Systems Group, Institute of Nuclear and Particle Physics, NRCPS Demokritos, GR 15310, Aghia Paraskevi Attiki, Greece

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S. I. MISTAKIDIS

Department of Physics, University of Athens, Panepistimiopolis, GR 15784, Athens, Greece

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T. J. MASSART

Building, Architecture and Town Planning Department, 194/2, Universite Libre de Bruxelles, (ULB), 1050 Brussels, Belgium

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, and

I. S. MISTAKIDIS

Hellenic Army Academy Athens, Greece

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https://doi.org/10.1142/S0218348X15500267Cited by:3 (Source: Crossref)

Abstract

The entropy production and the variational functional of a Laplacian diffusional field around the first four fractal iterations of a linear self-similar tree (von Koch curve) is studied analytically and detailed predictions are stated. In a next stage, these predictions are confronted with results from numerical resolution of the Laplace equation by means of Finite Elements computations. After a brief review of the existing results, the range of distances near the geometric irregularity, the so-called "Near Field", a situation never studied in the past, is treated exhaustively. We notice here that in the Near Field, the usual notion of the active zone approximation introduced by Sapoval et al. [M. Filoche and B. Sapoval, Transfer across random versus deterministic fractal interfaces, Phys. Rev. Lett. 84(25) (2000) 5776;¹ B. Sapoval, M. Filoche, K. Karamanos and R. Brizzi, Can one hear the shape of an electrode? I. Numerical study of the active zone in Laplacian transfer, Eur. Phys. J. B. Condens. Matter Complex Syst. 9(4) (1999) 739-753.]² is strictly inapplicable. The basic new result is that the validity of the active-zone approximation based on irreversible thermodynamics is confirmed in this limit, and this implies a new interpretation of this notion for Laplacian diffusional fields.

Keywords:

PACS: 65.40.Gr, 05.70.Ln, 5.45.Df, 47.53.+n

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