Abstract
A study is made of the aspiration of perfectly flexible slender particles into a bulky sampling head which, for convenience, has been taken to be cylindrical. The ideal fluid is assumed to be flowing towards the sampler and an analytical approach is adopted to determine the flow field. The particle paths are then traced and the aspiration efficiency of the sampler determined. Both gravitational and inertial effects upon the particles trajectory are considered. The behaviour of the perfectly flexible slender particles is compared with that of perfectly rigid slender particles. It is seen that, although the flexible particles are forced to bend and deform by the strong velocity gradients in the vicinity of the sampling inlet, the difference between the aspiration of rigid and elastic particles is not significant. The effect of the slenderness of the particle is, however, significant.
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