Droplets’ Directional Motion Characteristics in Conical Microchannels and Driving Mechanisms

PANG Ming-hua; LIU Kun; LIU Xiao-jun

doi:10.21656/1000-0887.370158

Volume 38 Issue 3

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PANG Ming-hua, LIU Kun, LIU Xiao-jun. Droplets’ Directional Motion Characteristics in Conical Microchannels and Driving Mechanisms[J]. Applied Mathematics and Mechanics, 2017, 38(3): 284-294. doi: 10.21656/1000-0887.370158

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Droplets’ Directional Motion Characteristics in Conical Microchannels and Driving Mechanisms

doi: 10.21656/1000-0887.370158

¹Institute of Tribology, Hefei University of Technology, Hefei 230009, P.R.China;²School of Mechanical and Electrical Engineering, Henan Institute of Science and Technology, Xinxiang, Henan 453003, P.R.China

Funds: The National Natural Science Foundation of China(51375132)

Received Date: 2016-05-23
Rev Recd Date: 2016-06-14
Publish Date: 2017-03-15

Abstract

Abstract

The droplets’ directional motion characteristics in conical microchannels with different wetting properties and driving mechanisms were studied with the numerical simulation method and the energy-based analytical method to clarify the mechanisms for directional motions of liquid in nature. The effects of the conical angle, the contact angle between the droplet and the microchannel wall as well as the microchannel wetting property on the directional motion characteristics of the droplet in the conical microchannel, were obtained. The energy-based theoretical analysis and the numerical simulation both indicate that, the conical angle and the contact angle substantially influence the motion direction and the driving force of the droplet, but with different effectivenesses. The effectiveness is in holistic consistency in the hydrophilic conical microchannel, but local features emerge in the hydrophobic conical microchannel. The study provides a theoretic base for the research of directional motion mechanisms and microfluidic flow mechanisms in the solid interface.
- conical microchannel,
- directional motion,
- contact angle,
- wetting property

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References(22)

References

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