NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Use of a generalized Stokes number to determine the aerodynamic capture efficiency of non-Stokesian particles from a compressible gas flowThe aerodynamic capture efficiency of small but nondiffusing particles suspended in a high-speed 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.
Document ID
19890024965
Document Type
Reprint (Version printed in journal)
Authors
Israel, R. (Yale Univ. New Haven, CT, United States)
Rosner, D. E. (Yale University New Haven, CT, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1983
Publication Information
Publication: Aerosol Science and Technology
Volume: 2
Issue: 1 19
ISSN: 0278-6826
Subject Category
FLUID MECHANICS AND HEAT TRANSFER
Funding Number(s)
CONTRACT_GRANT: F49620-82-K-0020
CONTRACT_GRANT: NAG3-201
Distribution Limits
Public
Copyright
Other