Separation criteria of nanoscale water droplets from a nozzle plate surface

¹ Faculty of Mechanical Engineering, Ha Noi University of Industry, Cau Dien Street, Bac Tu Liem District, Hanoi
² Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Taiwan

^a Corresponding author: daniel@kuas.edu.tw

Abstract

This paper studies the water nanojet ejection process using molecular dynamics simulation. The results show that nanoscale water droplets cannot separate from the nozzle plate surface when the nozzle aperture has a diameter of 27.5 Å or smaller. The maximum height of the produced water nanojet is reduced after reaching to its highest position when the jet does not separate from the plate surface. Separation phenomenon between the water nanojet and the nozzle plate surface is the most obvious with the 27.5-Å-diameter nozzle aperture for this simulation setup. In addition, initial findings on the characteristics of nanoscale water droplets (width and contact angle) impinging onto a fixed plate surface are revealed in preparation for future investigation.