Three Things about a CVI

MIKHAIL S. PEKOUR, Gourihar R. Kulkarni, and Daniel J. Cziczo

Pacific Northwest National Laboratory

     Abstract Number: 535
     Last modified: May 13, 2010

Abstract
Counter Flow Virtual Impactors have been successfully used for the last 25 years. As part of the development of a new Compact Ice Chamber (see Kulkarni et al., AAAR, 2010) we evaluated a Pumped Counter Flow Impactor (PCVI) in laboratory tests, quasi-1D numerical model, and CFD simulations. Numerical modeling and CFD simulations were able to resolve the main features of the PCVI and provide valuable insight into the processes within the PCVI. The current poster is focused on 3 topics: (a) shape of the transmission efficiency curve, and why it differs from an ideal step function; (b) transmission artifact of small size particles (much less than the cut size); (c) potential break up or splintering of particles/droplets in the CVI. All three issues need to be addressed in any practical application; insights and conclusions can be extended to CVIs of different design and morphology.