منابع مشابه
Faceted drops on heterogeneous surfaces
– We report an experimental study of the shape of large liquid drops spreading on surfaces with patterns of wettability. A heterogeneous surface exhibits multiple energy minima of free energy for the three-phase system. In particular, when the distribution of defects on the substrate is periodic (square or hexagonal), it is possible to initiate a transition between circular and faceted drops. W...
متن کاملStick-slip sliding of water drops on chemically heterogeneous surfaces.
We present a comprehensive study of water drops sliding down chemically heterogeneous surfaces formed by a periodic pattern of alternating hydrophobic and hydrophilic stripes. Drops are found to undergo a stick-slip motion whose average speed is an order of magnitude smaller than that measured on a homogeneous surface having the same static contact angle. This motion is the result of the period...
متن کاملWater Drops on Surfaces
Water motion is a highly complex phenomenon. From ocean waves to raindrops, water is described by a wide range of shapes and is affected by a wide range of forces. This paper presents a physically-based method of modeling the latter phenomenon raindrops. This model can handle bodies of water with varying underlying terrain, as well as many different fluids, but cannot represent spray systems, w...
متن کاملDynamics of sliding drops on superhydrophobic surfaces
– We use a free energy lattice Boltzmann approach to investigate numerically the dynamics of drops moving across superhydrophobic surfaces. The surfaces comprise a regular array of posts small compared to the drop size. For drops suspended on the posts the velocity increases as the number of posts decreases. We show that this is because the velocity is primarily determined by the contact angle ...
متن کاملContact angle hysteresis of cylindrical drops on chemically heterogeneous striped surfaces.
Contact angle hysteresis of a macroscopic droplet on a heterogeneous but flat substrate is studied using the interface displacement model. First, the apparent contact angle of a droplet on a heterogeneous surface under the condition of constant volume is considered. By assuming a cylindrical liquid-vapor surface (meniscus) and minimizing the total free energy, we derive an equation for the appa...
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ژورنال
عنوان ژورنال: Europhysics Letters (EPL)
سال: 2001
ISSN: 0295-5075,1286-4854
DOI: 10.1209/epl/i2001-00405-1