Influence of nano- and micro-roughness on vortex generations of mixing flows in a cavity

Experiments were carried out in a water-filled elongated cup of “kitchen scale,” where motion was created by rotating disk with various micro- and nano-roughness the top cup. The obtained results have shown that for some patterns nanostructures, there is noticeable growth vortex, generated disk, while other roughnesses do not make visible changes flow structure. are interest assessing efficiency surfaces nanoscale roughnesses. Indeed, first type may become useful enhancing soft mixing chemical bio-reactors, including preparation special food delicacies. On hand, use nanostructured affect main can help to solve industrial problems water ice erosion, example, wind turbines or any objects disturbances undesirable.