Cleaning of sensitive surfaces with cavitation bears the danger of damage, even at higher ultrasonic frequencies. Recently it has become clear that for micro- and nano- particulate contaminations also "soft" cavitation bubbles could be efficient cleaning agents: gently driven surface attached bubbles that do not undergo strong oscillations and collapse. Here the motion of the three-phase boundary (contact line) plays a crucial role, and we designed a micro-flow channel to explore in more detail its cleaning power. At the same time, a standard method for measurement of stickiness of particles should be developed. We present first results and comparison to flow simulations. Preliminary observations show enhanced cleaning by an avalanche effect produced by looser particles carried in the flow and a large amount of particles stored in the air-water interface. This increases cleaning efficiency with flow velocity.
|Number of pages||2|
|Publication status||Published - 2014|
|Event||DAGA 2014 - Oldenburg, Germany|
Duration: 10 Mar 2014 → 13 Mar 2014
|Period||10/03/14 → 13/03/14|