In this paper a study is made of the sampling characteristics of a dis
kshaped sampler facing a turbulent wind. The Reynolds-averaged Navier-
Stokes equation and the k-epsilon turbulence model are used to predict
the turbulent mean fluid motion past an axially symmetric disklike sa
mpler, where the sampler is taken to have a single orifice on the side
facing the oncoming flow. Based on the resulting velocity distributio
n of the fluid flow, the equations of motion of the particle are trace
d in order to obtain the particle trajectories which are then used to
determine the aspiration efficiency of the sampler. The dependence of
the aspiration efficiency on the five parameters, namely, the Stokes n
umber St, the velocity ratio of the free stream speed to the suction s
peed (U0/U(s), the ratio of the sampler diameter to the orifice diamet
er (D0/D), the Reynolds number (Re) and the turbulence intensity (I) h
as systematically been investigated. It is of interest to note that a
comparison of the present results with the proposed impaction model re
veals some interesting phenomena. Of all the theoretical predictions,
the present computational results give the best agreement with all the
available experimental data and this agreement is good. Thus the mode
l may be extended to study the flow and particle characteristics for t
hree-dimensional samplers.