Asampler was developed to trap windblown particles for a wind erosion field study, and an experimental investigation was undertaken to determine its performance characteristics. A laboratory wind tunnel was employed to ascertain whether the sampler was sampling isokinetically, efficiently, and nonselectively. Experiments have demonstrated that in order for there to be proper flow into the sampler there must be proper flow out of the sampler. This not only requires a vent to exhaust the air but also requires the use of the external wind energy to pull the air through the sampler's diffuser. It was found that by adjusting the size of the ventilation screens, located at the rear of the sampler, a variation of the inlet flow could be produced. There appeared to be an optimum ventilation screen size for which the inlet flow was isokinetic. The magnitude of the inlet velocity affected the trapping efficiency of the total mass and the trapping efficiency for a given particle size range.
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Stout et al. (1989) studied this question.