This is a picture from a high speed video showing jetting behaviour of a 20uL water droplet induced by ZnO surface acoustic waves (from left side). The jetting is induced by sub-nanometre amplitudes of surface acoustic waves interacting with water droplet, causing the droplet jetting along Rayleigh angle. However, due to a combination of acoustic pressure, internal flow, gravity force, surface tension and capillary, the droplet has been deformed significantly before fully jetted from substrates. (The photo is not a composite and has not been enhanced.)
Large droplet jetting by a combination of acoustic wave, surface tension and gravity —

This is a picture from a high speed video showing jetting behaviour of a 20uL water droplet induced by ZnO surface acoustic waves (from left side). The jetting is induced by sub-nanometre amplitudes of surface acoustic waves interacting with water droplet, causing the droplet jetting along Rayleigh angle. However, due to a combination of acoustic pressure, internal flow, gravity force, surface tension and capillary, the droplet has been deformed significantly before fully jetted from substrates. (The photo is not a composite and has not been enhanced.)

https://fluids.ac.uk/pictures/competition/7-droplet_jetting.png