Fur of dogs and other mammals dries due to rapid oscillation that sheds droplets efficiently.

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The drying of wet fur is a critical to mammalian heat regulation. We
investigate experimentally the ability of hirsute animals to rapidly
oscillate their bodies to shed water droplets, nature’s analogy to the spin
cycle of a washing machine. High-speed videography and fur-particle tracking
is employed to determine the angular position of the animal’s shoulder skin
as a function of time. We determine conditions for drop ejection by
considering the balance of surface tension and centripetal forces on drops
adhering to the animal. Particular attention is paid to rationalizing the
relationship between animal size and oscillation frequency required to
self-dry.” (Dickerson et al. 2010)

“Andrew Dickerson and colleagues at the Georgia Institute of Technology
drenched 27 animals (including a lab mouse, six different kinds of dogs,
and a tiger from Atlanta’s zoo) and filmed the animals, at up to 1,000
frames per second, shedding the water. They discovered that shaking
speed relates to body size and can be described with a simple
mathematical model. The new insights into animals’ shaking could be used
to develop more efficient washers, dryers, painting equipment, and spin
coaters.” (Doermann 2011)

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A better spin cycle: more-efficient washers and dryers inspired by dogs

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Living System/s

DogCanis lupusInfraspecies

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