A structural model for gas-solid reactions with a moving boundary—III: A general dimensionless representation of the irreversible reaction between a porous solid and a reactant gas
A structural model for gas-solid reactions with a moving boundary—III: A general dimensionless representation of the irreversible reaction between a porous solid and a reactant gas
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DOI：
10.1016/0009-2509(72)85011-5
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发表时间：
1972-04
影响因子：
4.7
通讯作者：
H. Sohn;J. Szekely
中科院分区：
文献类型：
--
作者：
H. Sohn;J. Szekely
建立了描述非催化气固反应的通用结构模型;其允许由球形或平板状颗粒组成的球形和平板状颗粒。控制方程的无量纲形式的数值解导致实现完全反应的无量纲时间相对于气-固反应模量的曲线图，这是有效的所有考虑的几何形状。使用这个图可能是有用的计划的实验或解释的实验数据，在结构模型方面，而不需要数字计算。它表明，对于极端值的气-固反应模量，模型的结果分别归结为“收缩核”模型和“均匀反应球”模型的渐近解。因此，“气-固反应模量”有助于定量定义这些渐近制度的范围，在化学和结构参数的系统。
A general structural model is developed for the description of non-catalytic gas-solid reactions; which allows for spherical and flat plate like pellets, made up of spherical or flat plate-like grains.The numerical solution of the dimensionless form of the governing equations results in a plot of the dimenionless time to achieve complete reaction against a gas-solid reaction modulus, which is valid for all the geometries considered.The use of this plot could be useful for the planning of experiments or for the interpretation of experimental data, in terms of structural models, without the need for digital computation.It is shown that for extreme values of the gas-solid reaction modulus, the results of the model reduce to the asymptotic solutions corresponding to the “shrinking core” and the “uniform reacting pellet” models respectively. Thus the “gas-solid reaction modulus” is helpful for the quantitative definition of the range of these asymptotic regimes, in terms of the chemical and structural parameters of the system.