Abstract
In this study, the focus is to model the physics of acoustic harvesting for 100 nanometer particles in order to lay the groundwork for technical feasibility studies. Based on a simplified 2D test-case channel geometry with an intense acoustic standing wave field the relevant drag and acoustic forces are reviewed and implemented in a numerical model. The standing wave is appropriately formulated to harvest particles in one single pressure antinode which conforms to the centerline of the channel. The particle trajectories along the chosen test-case channel have been analytically verified. Advancements in the acoustic manipulation of particles have mainly received attention for liquid carrier media. The conceived model is numerically stable and suitable to assess the potential of harvesting nanometer aerosols in gaseous environments.
Highlights
Acoustic harvesting denotes the effect of accumulating e.g. airborne nanometer particles in a standing wave field
In life sciences and medical applications the use of intense acoustic fields at frequencies typically of the order of several kHz is a mature and well-established technique to manipulate the trajectory of a particle in a liquid carrier medium
Particle manipulation by means of intense acoustic ultrasound fields is a mature technique which is well-established in applications with a liquid carrier medium
Summary
Acoustic harvesting denotes the effect of accumulating e.g. airborne nanometer particles in a standing wave field. The adaptation to gaseous carriers is a promising approach to enhance the control of particle emissions Renewable energy sources such as wood and biomass produce significant amounts of fly ash during combustion with particle diameters typically in the realm of nanometers. Conventional separation techniques such as the electrostatic precipitation have excellent filtration efficiency for micron-sized particles [1], whereas smaller particles are more difficult to capture. Such particles pose a considerable health hazard due to their capability to penetrate the respiratory system
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