Peristaltic motion of liquid droplets along metal surfaces under the influence of plasma of nanosecond spark micro discharges

A. E. Dubinov^{1, 2, 3} - J. P. Kozhayeva^{1, 2, 3} - V. A. Lyubimtseva^{1, 2, 3} - V. D. Selemir^{1, 2, 3}

¹ Russian Federal Nuclear Center, All-Russian Scientific and Research Institute of Experimental Physics, 37 Mira ave., Sarov, Nizhny Novgorod region 607188, Russia
² Moscow Engineering Physics Institute, National Research Nuclear University, 31 Kashirskoye highway, Moscow 115409, Russia
³ Sarov State Institute of Physics and Technology, 6 Dukhova str., Sarov, Nizhny Novgorod region 607186, Russia

Abstract
The effect of a sequence of nanosecond spark discharges on sessile liquid droplets on the surface of metals was investigated. The effect of the droplet motion towards the discharge channel was detected. The features of this movement were studied, and a peristaltic nature of the motion was shown. Space-time parameters of the motion were measured. According to the results of the measurement of contact angles, it was found that the motion is caused by a change in surface wettability by the liquid under the influence of the contact between plasma and the droplets. For oils, an anti-effect has been found consisting in droplet motion from the discharge channel with the change of its shape. Tables 3, Figs 14, Refs 41.