To test the performance of aerosol samplers, a new method is proposed which uses scaling relationships and existing empirical equations for aspiration efficiency. The method may be used to prescribe experimental conditions and small-scale sampler designs that can be tested in small wind tunnels that are physically equivalent to testing full-scale samplers in large wind tunnels. The basic assumptions which underlie the measurement of aerosol sampler performance and the quantitative effects of errors arising from spatial and temporal non-uniformities in aerosol distributions are examined. Aspiration efficiency is strongly dependent on the spatial distributions of air velocity and particle concentration far upstream of the sampler.
ASJC Scopus subject areas
- Environmental Engineering
- Mechanical Engineering
- Fluid Flow and Transfer Processes
- Atmospheric Science