›› 2014, Vol. 23 ›› Issue (7): 74702-074702.doi: 10.1088/1674-1056/23/7/074702

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

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

胡海豹, 陈立斌, 鲍路瑶, 黄苏和   

  1. School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China
  • 收稿日期:2013-08-01 修回日期:2013-11-22 出版日期:2014-07-15 发布日期:2014-07-15
  • 基金资助:
    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).

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)   

  1. School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2013-08-01 Revised:2013-11-22 Online:2014-07-15 Published:2014-07-15
  • Contact: Hu Hai-Bao E-mail:huhaibao@nwpu.edu.cn
  • About author:47.55.dr; 47.61.-k; 47.11.-j
  • Supported by:
    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).

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摘要： 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.

关键词: nano-droplet, hydrophobic surface, molecular dynamics, velocity distribution

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.

Key words: nano-droplet, hydrophobic surface, molecular dynamics, velocity distribution

中图分类号:  (Interactions with surfaces)

  • 47.55.dr
47.61.-k (Micro- and nano- scale flow phenomena) 47.11.-j (Computational methods in fluid dynamics)