Abstract
A study has been made of the fluid mechanics of laminar flow aerosol impactors of both the rectangular and round geometry. Streamlines in a rectangular impactor were obtained theoretically by solving the Navier-Stokes equations on a computer. The results were found to be in good agreement with experimentally generated streamlines in a water model using an electrolytic flow visualization technique. Further theoretical studies of the impactor using the computer solution technique showed that the flow field in the impaction region above the impaction plate is influenced only to a very limited extent by the impactor throat length while the effect due to variations in the jet-to-plate distance and the jet Reynolds number is somewhat larger. The boundary layer thickness along the impaction plate was found to be nearly constant, but the thickness was dependent on the jet Reynolds number and affected to a very slight extent by the jet-to-plate distance.
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