Abstract
The Coalescence-Induced Jumping of Tens of Microns Size Droplets on Super-Hydrophobic Surfaces Has Been Observed in Both Experiments and Simulations. However, Whether the Coalescence-Induced Jumping Would Occur for Smaller, Particularly Nanoscale Droplets, is an Open Question. using Molecular Dynamics Simulations, We Demonstrate that in Spite of the Large Internal Viscous Dissipation, Coalescence of Two Nanoscale Droplets on a Super-Hydrophobic Surface Can Result in a Jumping of the Coalesced Droplet from the Surface with a Speed of a Few M/s. Similar to the Coalescence-Induced Jumping of Microscale Droplets, We Observe that the Bridge between the Coalescing Nano-Droplets Expands and Impacts the Solid Surface, Which Leads to an Acceleration of the Coalesced Droplet by the Pressure Force from the Solid Surface. We Observe that the Jumping Velocity Decreases with the Droplet Size and its Ratio to the Inertial-Capillary Velocity is a Constant of About 0.126, Which is Close to the Minimum Value of 0.111 Predicted by Continuum-Level Modeling of Enright Et Al. [ACS Nano 8, 10352 (2014)].
Recommended Citation
Z. Liang and P. Keblinski, "Coalescence-Induced Jumping of Nanoscale Droplets on Super-Hydrophobic Surfaces," Applied Physics Letters, vol. 107, no. 14, article no. 143105, American Institute of Physics, Oct 2015.
The definitive version is available at https://doi.org/10.1063/1.4932648
Department(s)
Mechanical and Aerospace Engineering
International Standard Serial Number (ISSN)
0003-6951
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2023 American Institute of Physics, All rights reserved.
Publication Date
05 Oct 2015
