Experimental and numerical study of airflow pattern and particle dispersion in a vertical ventilation duct

摘要: Abstract A numerical simulation has been conducted to investigate the behavior of airflow and dispersion size-dependent particles in ventilation duct. To examine prediction accuracy for our simulation, we compared computational fluid dynamics (CFD) results with particle image velocimetry (PIV) measurement data an isothermal duct model. The low Reynolds number type k – ɛ turbulent model was selected further calculation because its predictions were most accurate this study. transport approach, combining Eulerian approach Lagrangian trajectory tracking, adopted pattern removal efficiency Two scenarios, one without a baffle, also determine effects on mechanisms. We effectiveness as by using simulated results, which showed that fraction coarse retained higher than fine retained. found vertical baffle perfect sink condition wall surfaces increased deposition decreased escape. Because two opposing mechanisms, i.e., escape, impact thermophoresis retaining not significant velocities.