Abstract View
Using CFD Method to Study the Particle Transportation Characteristics through a Critical Orifice
DA YANG, Suresh Dhaniyala, Pedro Campuzano-Jost, Jose-Luis Jimenez, Dongwook Kim, Hongyu Guo, Clarkson University
Abstract Number: 563
Working Group: Instrumentation and Methods
Abstract
Low-pressure aerosol measurements often require sample flows to pass through a critical orifice and the fate of particles through the orifice determines the accuracy of these measurements. Despite the fact that orifice systems are integral to many aerosol measurements, we have limited knowledge of the aerosol transport efficiency through them. Modeling the transport of aerosol particles through a critical orifice is complicated by the interaction of super-sonic flow structures, turbulence, non-continuum effects, and strong gradients in flow velocities. In this study, we use computational fluid dynamics (CFD) software, FLUENT 18.1, to model flow through an orifice under different orifice sizes, downstream pressures, and downstream geometries and compare our simulation results to experimental data. We demonstrate the importance of orifice downstream geometry and associated flow features in critically determining size-dependent particle penetration curves.