دانلود مقاله A numerical study of the aspiration efficiency of a thin-walled sampler in subisokinetic sampling
سال انتشار: ۱۳۸۴
محل انتشار: دهمین کنگره ملی مهندسی شیمی ایران
تعداد صفحات: ۸
Ali Tahavvora – Ph.D. Student, Mechanical Engineering Department, School of Engineering, Shiraz University, Zand Street, Shiraz 71348-51154, Iran
Abouali – bAssistant Professor, Mechanical Engineering Department, School of Engineering, Shiraz University, Zand Street, Shiraz 71348-51154, Iran
Ahmadi – Professor of Mechanical engineering, Department of Mechanical and Aeronautical Engineering, Clarkson University, NY 13699-5725, USA
Governing equations for particles’ motion are solved in a lagrangian reference frame. Having the particles’ paths, aspiration efficiency of the sampler is determined. Three particle sizes, characterized by aerodynamic diameter of 13, 34 and 89.5 µm, were considered. Then, in order to validate the numerical results, present work is compared with the previous experimental and numerical works. The previous numerical works for prediction of the sampling efficiency were not accurate at high values of velocity ratios. The results of this work show that the viscous effects play an important role on modeling of the sampler performance and the aspiration efficiency is affected by the gravitational effects.