The one dimensional two-zone model (1D-2Z) to estimate effectiveness factor in non-uniform coatings of metallic monolith channels with sinusoidal cross-section is thoroughly tested in this contribution. The model relies on the idea of splitting the cross-section of the coating in two zones that can be modelled independently taking into account the diffusion and simultaneous reaction in a single direction (1D). One of the zones is considered as a slab, while the previously developed variable diffusivity model (1D-VD) is applied to the other. The predictive capabilities of the 1D-2Z model is assessed for three kinetic expressions: a first order reaction and two more challenging cases defined by Langmuir-Hinshelwood-Hougen-Watson expressions: one of them with a moderate self-inhibition effect and the other with a strong self-inhibition effect, close to the onset of the multiple steady states behaviour. Simultaneously, different degrees of non-uniform coatings are considered. The 1D-2Z model allows obtaining a remarkable precision in the estimation of the effectiveness factors for the complete range of Thiele modulus with maximum errors below 5.6%.

用于估计具有正弦横截面的金属整体通道的非均匀涂层的有效性因子的一维两区模型 (1D-2Z) 在此贡献中得到了彻底测试。该模型依赖于将涂层的横截面分成两个区域的想法，这两个区域可以独立建模，同时考虑到单个方向 (1D) 上的扩散和同时反应。其中一个区域被视为板，而先前开发的可变扩散率模型（1D-VD）应用于另一个区域。1D-2Z 模型的预测能力针对三个动力学表达式进行评估：一级反应和两个由 Langmuir-Hinshelwood-Hougen-Watson 表达式定义的更具挑战性的情况：其中一个具有中等的自我抑制作用，另一个具有强大的自我抑制作用，接近多个稳态行为的开始。同时，考虑不同程度的不均匀涂层。1D-2Z 模型允许在估计整个 Thiele 模量范围内的有效性因子时获得显着的精度，最大误差低于 5.6%。