A model for the film growth in samples with two moving reaction frontiers -: an application and extension of the unreacted-core model

被引：26

作者：

Braun, A ^{[1
]}

Bärtsch, M ^{[1
]}

Schnyder, B ^{[1
]}

Kötz, R ^{[1
]}

机构：

[1] Paul Scherrer Inst, Gen Energy Res Dept, CH-5232 Villigen, Switzerland

来源：

CHEMICAL ENGINEERING SCIENCE | 2000年 / 55卷 / 22期

关键词：

film growth; Lambert W function; unreacted core shrinking; carbon activation; exactly solvable growth model;

D O I：

10.1016/S0009-2509(00)00143-3

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

A mathematical expression for the film thickness in a flat sample, reacting with a fluid, as a function of reaction time is derived. The formulation is based on a gas-solid reaction similar to the unreacted core shrinking model and takes into account two moving reaction frontiers, one due to the shrinking unreacted core, and one due to the changing thickness of the samples as a result of combustion. The equation of motion for the two reaction boundaries is solved exactly for flat samples applying a Lambert W function. The model for the flat samples is compared with experimental results. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：5273 / 5282

页数：10

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