ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Molecular dynamics simulations of the nano-droplet impact process on hydrophobic surfaces |
Hu Hai-Bao (胡海豹), Chen Li-Bin (陈立斌), Bao Lu-Yao (鲍路瑶), Huang Su-He (黄苏和) |
School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China |
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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.
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Received: 01 August 2013
Revised: 22 November 2013
Accepted manuscript online:
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PACS:
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47.55.dr
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(Interactions with surfaces)
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47.61.-k
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(Micro- and nano- scale flow phenomena)
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47.11.-j
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(Computational methods in fluid dynamics)
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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
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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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