AAAR 37th Annual Conference October 14 - October 18, 2019 Oregon Convention Center Portland, Oregon, USA
Abstract View
Aerodynamic Resuspension of RDX Trace Particles by Planar Impinging Air Jet
KALYAN KOTTAPALLI, Harikrishnan Murali, Guanyu Song, Igor Novosselov, University of Washington
Abstract Number: 805 Working Group: Aerosol Physics
Abstract Trace residues of illicit substances and biological contamination of the surfaces remain accessible for long times because of their low volatility. Though the non-contact surface sampling has been demonstrated, the resuspension rates for an extended range of particle/surface systems are needed. Aerodynamic particle resuspension is a function of many parameters, such as particle size, morphology, surface properties, environmental conditions, and wall jet properties. We present the data and analysis of the removal rates of Trimethylenetrinitramine (RDX) resulted from an impinging flat jet as a function of wall shear stress. Samples are prepared by dry transfer method on the glass surface and interrogated under various flow conditions and exposure times. The samples are examined optically and binned by their visible area. The resuspension data for 6-30 µm particles from the impinging jet experiment are correlated with forces acting on the particles from Computational Fluid Dynamics (CFD) modeling as a function of wall shear stress showing a direct correlation with the particle removal rates. The removal efficiency of RDX from glass increases by 8-14 % with an increase in the flow exposure time.