Dynamical model for chemically driven running droplets.
Dynamical model for chemically driven running droplets.
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DOI：
10.1103/physrevlett.93.027802
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发表时间：
2004-03
影响因子：
8.6
通讯作者：
U. Thiele;Karin John;M. Bär
中科院分区：
文献类型：
--
作者：
U. Thiele;Karin John;M. Bär
我们提出了耦合的演化方程的液体膜的厚度和密度的吸附层上的部分润湿的固体基板。其中，假设在液滴下面的化学反应，该化学反应在基板上引起润湿性梯度并提供液滴运动的驱动力，来研究运行的液滴。描述了两种不同的运动液滴制度--反应限制制度和饱和制度。它们分别对应于随着反应速率和液滴尺寸的增加而增加和减小的速度。这两种机制的存在为先前的实验观察提供了一个自然的解释。
We propose coupled evolution equations for the thickness of a liquid film and the density of an adsorbate layer on a partially wetting solid substrate. Therein, running droplets are studied assuming a chemical reaction underneath the droplets that induces a wettability gradient on the substrate and provides the driving force for droplet motion. Two different regimes for moving droplets--reaction-limited and saturated regime--are described. They correspond to increasing and decreasing velocities with increasing reaction rates and droplet sizes, respectively. The existence of the two regimes offers a natural explanation of prior experimental observations.