Db. Ingham et al., ASPIRATION EFFICIENCY OF A THIN-WALLED SHALLOW-TAPERED SAMPLER REAR-FACING THE WIND, Journal of aerosol science, 26(6), 1995, pp. 933-944
The aspiration efficiency of a thin-walled, shallow-tapered aerosol sa
mpler, as studied by Vincent et al. (1986, J. Aerosol Sci. 17, 211-224
), which is rear-facing the wind is numerically investigated. The turb
ulent fluid flow is predicted by employing the control volume, finite-
difference method with a body-fitted coordinate system and a low Reyno
lds number k-epsilon turbulence model. The particle trajectories are c
alculated by integrating the particle equations of motion using either
the turbulent instantaneous fluid velocity (a stochastic model) or th
e mean fluid motion (the mean motion model). The aspiration efficiency
for thin-walled, shallow-tapered samplers which rear-face the wind as
predicted by the two models, are in good agreement and although the r
esults show an unusual behaviour they agree reasonably well with all t
he available experimental data.