Two-Dimensional Numerical Analysis of Gas Diffusion-Induced Cassie to Wenzel State Transition
Two-Dimensional Numerical Analysis of Gas Diffusion-Induced Cassie to Wenzel State Transition
复制标题
气体扩散引起的 Cassie 到 Wenzel 态转变的二维数值分析
DOI：
10.1115/1.4051320
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Hodes, Marc
中科院分区：
文献类型：
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作者：
Mayer, Michael D.;Kadoko, Jonah;Hodes, Marc
我们开发了一个二维模型的瞬态扩散的气体从脊型结构表面的空腔悬浮在他们上方的Cassie状态的静态液体预测的位置的液体蒸汽界面（弯月面）作为时间的函数。瞬态扩散方程数值求解的Chebyshev配置（光谱）方法耦合到杨拉普拉斯方程和理想气体定律。我们捕捉变量弯月面曲率的影响，随后，在适用的情况下，三重接触线的运动。给出了液体中溶解气体浓度场的演变结果，以及弯月面脱钉所需的时间和寿命，即，凯西到温泽尔状态转换的开始两种配置进行检查;即，一种是不可渗透的膜对脊部上方的液体加压，另一种是考虑流体静压并且液体的顶部暴露于不可冷凝的气体。
We develop a two-dimensional model for the transient diffusion of gas from the cavities in ridge-type structured surfaces to a quiescent liquid suspended above them in the Cassie state to predict the location of the liquid vapor-interface (meniscus) as a function of time. The transient diffusion equation is numerically solved by a Chebyshev collocation (spectral) method coupled to the Young–Laplace equation and the ideal gas law. We capture the effects of variable meniscus curvature and, subsequently, when applicable, movement of triple contact lines. Results are presented for the evolution of the dissolved gas concentration field in the liquid and, when applicable, the time it takes for a meniscus to depin and that for longevity, i.e., the onset of the Cassie to Wenzel state transition. Two configurations are examined; viz., one where an impermeable membrane pressurizes the liquid above the ridges and one where hydrostatic pressure is considered and the top of the liquid is exposed to noncondensible gas.