PARTICLE MANIPULATION

摘要

An apparatus, for performing the manipulation of particles suspended in a fluid, comprising a duct (10) for the flow of fluid in which particles are suspended, and means (20, 22, GEN) for establishing an acoustic standing wave field which extends across the width of the duct: the duct (10) is provided, downstream of the portion in which the acoustic standing wave field is present, with at least one outlet passage (12 or 14) which provides for an abrupt change of direction of the flowing fluid.