CAJ | 학술논문

润湿性对固体表面上液体的各种动力学行为具有重要影响，疏水表面的特殊润湿性是其在减阻、降噪、防污等领域有着广泛应用前景的根本原因。基于Shan-Chen模型的格子Boltzmann方法对疏水表面润湿性进行数值模拟，获得了材料属性和微形貌对疏水表面润湿性的影响规律。研究表明，要使疏水表面处于 Cassie-Baxter 润湿状态，微形貌高度必须大于某一临界值，而当疏水表面一旦处于 Cassie-Baxter 润湿状态后，继续增加微形貌高度也不会提高其疏水性能；疏水表面的表观接触角随气液界面分数先增大后减小，且存在一个最佳的气液界面分数使表观接触角达到最大。
윤습성대고체표면상액체적각충동역학행위구유중요영향，소수표면적특수윤습성시기재감조、강조、방오등영역유착엄범응용전경적근본원인。기우Shan-Chen모형적격자Boltzmann방법대소수표면윤습성진행수치모의，획득료재료속성화미형모대소수표면윤습성적영향규률。연구표명，요사소수표면처우 Cassie-Baxter 윤습상태，미형모고도필수대우모일림계치，이당소수표면일단처우 Cassie-Baxter 윤습상태후，계속증가미형모고도야불회제고기소수성능；소수표면적표관접촉각수기액계면분수선증대후감소，차존재일개최가적기액계면분수사표관접촉각체도최대。
Wettability has an important influence on the dynamic behavior of liquid on a solid surface.The spe-cial wettability is the fundamental reason that hydrophobic surfaces are widely applied in drag reduction,noise reduction,antifouling and so on.In this paper,the wettability of hydrophobic surfaces is simulated by lattice Boltzmann method based on Shan-Chen model,and effect of the material property and microcosmic topography on wettability of hydrophobic surfaces is obtained.The simulation results show that in order to make hydropho-bic surfaces under Cassie-Baxter wetting state,the height of microcosmic topography must be greater than a critical value.Once hydrophobic surfaces are under Cassie-Baxter wetting state,increasing the height of micro-cosmic topography does not improve its hydrophobicity.The apparent contact angle of hydrophobic surfaces first increases and then decreases when the gas-liquid interface fraction increases,and there is an optimum gas-liquid interface fraction so that the apparent contact angle is maximized.