Effective diffusivity in transient state

被引：0

作者：

Tabor, Zbislaw ^{[1
]}

Nowak, Pawel ^{[2
]}

Krzak, Malgorzata ^{[2
]}

Warszynski, Piotr ^{[2
]}

机构：

[1] Cracow Univ Technol, PL-31155 Krakow, Poland

[2] J Haber Inst Catalysis & Surface Chem PAS, PL-30239 Krakow, Poland

来源：

JOURNAL OF CHEMICAL PHYSICS | 2013年 / 139卷 / 07期

关键词：

INHOMOGENEOUS-MEDIA; POLYMER-COATINGS; WATER DIFFUSION;

D O I：

10.1063/1.4818579

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effective diffusivity in a polymer matrix modified with inclusions is usually calculated based on Kalnin-Kotomin's model [J. R. Kalnin, E. A. Kotomin, and J. Maier, J. Phys. Chem. Solids 63, 449-456 (2002)], which extends the well known Maxwell-Garnett formula. Kalnin-Kotomin's model correctly predicts effective diffusivity for stationary diffusion or for infinite media. In the present paper diffusion in composite media is studied for finite systems under transient conditions. The process of diffusion is modeled numerically and effective diffusion coefficient in the transient state is estimated, which, under certain conditions, is different from the predictions of the Kalnin-Kotomin's model. An analytical model is proposed to explain deviations of the transient effective coefficient of diffusion from the stationary case. (C) 2013 AIP Publishing LLC.

引用

页数：8

共 13 条

[1]

[Anonymous], DEFECT DIFFUSION FOR

[2] The effective diffusivity in two-phase material [J].