سال انتشار: ۱۳۸۴
محل انتشار: دهمین کنگره ملی مهندسی شیمی ایران
تعداد صفحات: ۱۶
Zeinab Hosseini Doust – Chemical &Petroleum Engineering Dept., Sharif University of Technology
Fatolah Farhadi – Chemical &Petroleum Engineering Dept., Sharif University of Technology
gradient is studied. Both of the phenomena show negligible contribution to the overall molar flux. Pressure gradient, however, should not be neglected even though it may not contribute directly to the total flux. Assumption of an isobaric pellet can lead to contradiction with conservation of mass. To assess the validity of Fick’s equation approximation to the dusty gas model, the results of the dusty gas model and Fick’s equation are compared and the shortcomings of Fick’s approximation in explaining multi-component diffusion is studied. Effectiveness factors obtained from Fick’s equation with an effective diffusion coefficient does not show much deviation from the rigorous dusty gas model, however whentilized to study the phenomena inside a catalyst pellet, it is shown that it can be misleading in some cases.