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Chin. Phys. B, 2016, Vol. 25(6): 066401    DOI: 10.1088/1674-1056/25/6/066401

Numerical modeling of condensate droplet on superhydrophobic nanoarrays using the lattice Boltzmann method

Qing-Yu Zhang(张庆宇)1, Dong-Ke Sun(孙东科)2,3, You-Fa Zhang(张友法)1, Ming-Fang Zhu(朱鸣芳)1
1 Jiangsu Key Laboratory for Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China;
2 Department of Mechanical Engineering Technology, Purdue University, 401 North Grant Street, West Lafayette, IN 47907, USA;
3 Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China

In the present study, the process of droplet condensation on superhydrophobic nanoarrays is simulated using a multi-component multi-phase lattice Boltzmann model. The results indicate that three typical nucleation modes of condensate droplets are produced by changing the geometrical parameters of nanoarrays. Droplets nucleated at the top (top-nucleation mode), or in the upside interpillar space of nanoarrays (side-nucleation mode), generate the non-wetting Cassie state, whereas the ones nucleated at the bottom corners between the nanoarrays (bottom-nucleation mode) present the wetting Wenzel state. Time evolutions of droplet pressures at the upside and downside of the liquid phase are analyzed to understand the wetting behaviors of the droplets condensed from different nucleation modes. The phenomena of droplet condensation on nanoarrays patterned with different hydrophilic and hydrophobic regions are simulated, indicating that the nucleation mode of condensate droplets can also be manipulated by modifying the local intrinsic wettability of nanoarray surface. The simulation results are compared well with the experimental observations reported in the literature.

Keywords:  condensate droplet      superhydrophobic nanoarray      wettability      lattice Boltzmann method  
Received:  29 December 2015      Revised:  28 January 2016      Accepted manuscript online: 
PACS: (Thermodynamics studies of evaporation and condensation)  
  82.70.Uv (Surfactants, micellar solutions, vesicles, lamellae, amphiphilic systems, (hydrophilic and hydrophobic interactions))  
  05.50.+q (Lattice theory and statistics)  
  47.61.Fg (Flows in micro-electromechanical systems (MEMS) and nano-electromechanical systems (NEMS))  

Project supported by the National Natural Science Foundation of China (Grant Nos. 51101035, 51371051, and 51306037).

Corresponding Authors:  Ming-Fang Zhu     E-mail:

Cite this article: 

Qing-Yu Zhang(张庆宇), Dong-Ke Sun(孙东科), You-Fa Zhang(张友法), Ming-Fang Zhu(朱鸣芳) Numerical modeling of condensate droplet on superhydrophobic nanoarrays using the lattice Boltzmann method 2016 Chin. Phys. B 25 066401

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