Molecular dynamics simulations of the nano-droplet impact process on hydrophobic surfaces

doi:10.1088/1674-1056/23/7/074702

Abstract Large-scale molecular dynamics simulations are used to study the dynamic processes of a nano-droplet impacting on hydrophobic surfaces at a microscopic level. Both the impact phenomena and the velocity distributions are recorded and analyzed. According to the simulation results, similar phenomena are obtained to those in macro-experiments. Impact velocity affects the spread process to a greater degree than at a level of contact angle when the velocity is relatively high. The velocity distribution along the X axis during spread is wave-like, either W- or M-shaped, and the velocity at each point is oscillatory; while the edges have the highest spread velocity and there are crests in the distribution curve which shift toward the edges over time. The distribution along the Y axis is <- or >-shaped, and the segments above the middle have the lowest decrease rate in the spreading process and the highest increase rate in the retraction process.

Keywords: nano-droplet hydrophobic surface molecular dynamics velocity distribution

Received: 01 August 2013
Revised: 22 November 2013
Accepted manuscript online:

PACS:	47.55.dr	(Interactions with surfaces)
	47.61.-k	(Micro- and nano- scale flow phenomena)
	47.11.-j	(Computational methods in fluid dynamics)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51109178) and the Science and Technology Innovation Foundation of Northwestern Polytechnical University, China (Grant No. JC20120218).

Corresponding Authors: Hu Hai-Bao
E-mail: huhaibao@nwpu.edu.cn

About author: 47.55.dr; 47.61.-k; 47.11.-j

Cite this article:

Hu Hai-Bao (胡海豹), Chen Li-Bin (陈立斌), Bao Lu-Yao (鲍路瑶), Huang Su-He (黄苏和) Molecular dynamics simulations of the nano-droplet impact process on hydrophobic surfaces 2014 Chin. Phys. B 23 074702

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