Interaction and multiscale mechanics

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Surface wettability and contact angle analysis by dissipative particle dynamics

  • Lin, Tzung-Han (Department of Mechanical Engineering, National Taiwan University) ;
  • Shih, Wen-Pin (Department of Mechanical Engineering, National Taiwan University) ;
  • Chen, Chuin-Shan (Department of Civil Engineering, National Taiwan University)
  • Received : 2012.11.15
  • Accepted : 2012.12.07
  • Published : 2012.12.25
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Abstract

A dissipative particle dynamics (DPD) simulation was presented to analyze surface wettability and contact angles of a droplet on a solid platform. The many-body DPD, capable of modeling vapor-liquid coexistence, was used to resolve the vapor-liquid interface of a droplet. We found a constant density inside a droplet with a transition along the droplet boundary where the density decreased rapidly. The contact angle of a droplet was extracted from the isosurfaces of the density generated by the marching cube and a spline interpolation of 2D cutting planes of the isosurfaces. A wide range of contact angles from $55^{\circ}$ to $165^{\circ}$ predicted by the normalized parameter ($|A_{SL}|/B_{SL}$) were reported. Droplet with the parameters $|A_{SL}|>5.84B{_{SL}}^{0.297}$ was found to be hydrophilic. If $|A_{SL}|$ was much smaller than $5.84B{_{SL}}^{0.297}$, the droplet was found to be superhydrophobic.

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References

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