Influence of adsorption on the measurement of diffusion coefficients by Taylor dispersion
Influence of adsorption on the measurement of diffusion coefficients by Taylor dispersion
复制标题
吸附对泰勒色散扩散系数测量的影响
DOI：
10.1007/bf01443398
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发表时间：
1996
影响因子：
2.2
通讯作者：
M. Matthews
中科院分区：
文献类型：
--
作者：
G. Madras;B. L. Hamilton;M. Matthews
通过修改控制方程来解释可逆的非平衡吸附，研究了吸附对泰勒色散技术测量扩散系数的影响。由此产生的二维方程求解的显式有限差分技术。吖啶二氧化碳体系的实验数据表明，吖啶吸附在管壁上，这些数据与此模型进行了研究。通过对模型进行参数敏感性分析，考察了吸附位点数和吸附-解吸速率等参数对模型的影响。结果表明，由于溶质在管壁上的吸附，使测得的扩散系数与实际扩散系数的误差高达35%。每个参数的影响的检查将使Inure研究人员，以减少吸附的影响，在测量扩散系数的泰勒色散。
The effect of adsorption on the measurement of diffusion coefficients by the Taylor dispersion technique is investigated by modifying the governing equation to account for reversible, nonequilibrium adsorption. The resulting two-dimensional equations are solved by an explicit finite-difference technique. Experimental data for the acridine carbon dioxide system indicated that acridine adsorbs on the walls on the tubing and these data were investigated with this model. The influence of carious parameters including the number of sites and the rates of adsorption desorption was investigated by conducting a parametric sensitivity analysis on the model. It was found that adsorption of the solute on the wall of the tubing could produce an error as high as 35% on the measured diffusion coefficient compared to the actual diffusion coellicient. Examination of the influence of each of the parameters will enable Inure investigators to reduce the effect of adsorption in the measurement of diffusion coefficients by Taylor dispersion.