AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
Abstract View
Numerical Study on the Particle Trajectory inside an Optical Cavity with Direct Flow Configuration
HANEOL LEE, Youngsu Jung, Kibong Choi, WeonGyu Shin, Chungnam National University
Abstract Number: 280 Working Group: Instrumentation and Methods
Abstract As a first step towards developing an effective method of detecting bioaerosol particles, we conducted numerical simulations on the particle trajectory inside an optical cavity with direct flow configuration by using commercial code ANSYS FLUENT 15.0 solver. Two opposing nozzles were located inside optical cavity and sheath flow was used to focus particles effectively onto the line where light source passes through. In numerical simulations, Discrete Phase Model (DPM) and Discrete Random Walk Model (DRW) were used to obtain particle trajectory varying the aerosol sampling flow and sheath flow. Simulation results showed that using sheath flow greater than 0.5 L/min was effective way to prevent particles less than 4 micrometer from recirculating into optical cavity. For 0.7 L/min sheath flow rates, the average residence time of particles larger than 3 micrometer decreases as the size of particles becomes smaller. In contrast, the average residence time of particles smaller than 3 micrometer increases with the size of particles.