Aspiration of coarse aerosol by a thin-walled sampler

Sampling Errors in Cylindrical Nozzles

“…experiments conducted under the identical conditions make it possible to determine A?) = Af)/Ar), as reported by Lipatov et al (1986a).…”

“…In our recent paper (Lipatov et al, 1986a) another LTM version, based on the threadof-droplets technique, was proposed. Our method differs from the above in that, instead of observing the trajectory of a single particle near the sampler a system of monodisperse particles moving in succession in the same trajectory is observed.…”

“…Examination of the aerosol aspiration process and investigation methods (Belyaev et al, 1981;Belyaev and Kustov, 1984;Lipatov et al, 1986a) made it possible to suggest the existence of a particle flux due to the impact of particles onto the outer surface of the sampler body and their subsequent rebound and entry into the sampler orifice.' Under the action of inertial forces, an aerosol particle moving outside the limiting trajectory tube may reach the sampler's outer surface and either adhere to it or rebound.…”

“…The experimental apparatus was described by Lipatov et al (1986a). The experimental conditions were as follows: water droplet diameter d, = 30-100 pm at u, = 0.066-0.50 me s-', u = 0.2-13 me s-', d = 0.176 cm and (d/d,,,)-' = 1.01.…”

“…Mainly, aspiration distortions have been studied experimentally with axisymmetric samplers facing the wind (e.g., Zenker, 1971;Levin, 1972, 1974;Gibson and Ogden, 1977;Jayasekera and Davies, 1980;Vincent and Gibson, 1981;Davies and Subari, 1982;Grinshpun et al, 1985;Vincent et al, 1985;Chung and Ogden, 1986;Lipatov et al, 1986a;and others). According to Boothroyd (1971), Cadle (1975), and Belyaev et al (1981), these samplers are widely used in practical aerosol sampling.…”