Use of a generalized Stokes number to determine the aerodynamic capture efficiency of nonStokesian particles from a compressible gas flow
Abstract
The aerodynamic capture efficiency of small but nondiffusing particles suspended in a highspeed stream flowing past a target is known to be influenced by parameters governing small particle inertia, departures from the Stokes drag law, and carrier fluid compressibility. By defining an effective Stokes number in terms of the actual (prevailing) particle stopping distance, local fluid viscosity, and inviscid fluid velocity gradient at the target nose, it is shown that these effects are well correlated in terms of a 'standard' (cylindrical collector, Stokes drag, incompressible flow, sq rt Re much greater than 1) capture efficiency curve. Thus, a correlation follows that simplifies aerosol capture calculations in the parameter range already included in previous numerical solutions, allows rational engineering predictions of deposition in situations not previously specifically calculated, and should facilitate the presentation of performance data for gas cleaning equipment and aerosol instruments.
 Publication:

Aerosol Science Technology
 Pub Date:
 1983
 Bibcode:
 1983AerST...2...45I
 Keywords:

 Aerodynamic Drag;
 Compressible Flow;
 Gas Streams;
 Particle Motion;
 Stokes Flow;
 Capture Effect;
 Incompressible Flow;
 Velocity Distribution;
 Fluid Mechanics and Heat Transfer