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A liquid drop moves on a solid surface
if it is subjected to a
gradient of wettability or temperature. However, the pinning defects
on the surface manifested in terms of a wetting hysteresis, or first-order
nonlinear friction, limit the motion in the sense that a critical
size has to be exceeded for a drop to move. The effect of hysteresis
can, however, be mitigated by an external vibration that can be either
structured or stochastic, thereby creating a directed motion of the
drop. Many of the well-known features of rectification, amplification,
and switching that are generic to electronics can be engineered with
such types of movements. A specific case of interest is the random
coalescence of drops on a surface that gives rise to self-generated
noise. This noise overcomes the pinning potential, thereby generating
a random motion of the coalesced drops. Randomly moving coalesced
drops themselves exhibit a directed diffusive flux when a boundary
is present to eliminate them by absorption. With the presence of a
bias, the coalesced drops execute a diffusive drift motion that can
have useful applications in various water and thermal management technologies
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