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Wednesday, March 11 2020
12:00pm - 1:00pm
Howey - N110
free
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"Crack, buzz, and plop: the coupled mechanics of jetting citrus, flying insects, and splashing projectiles”

School of Physics, Nonlinear Science & Mathematics Seminar, Dr. Andrew Dickerson, University of Central Florida

Natural systems often inspire new methods by which to control fluids, or conversely use fluids to control systems. Three fluid mechanic systems that might come to mind include: the jetting of microdroplets when peeling an orange, the droplet ejection off of a mosquito wing, and the splash suppression provided by floating toilet paper during defecation. These phenomena at the interface of biology and fluid mechanics can provide engineers with useful, inspired information for future designs. Here we study the explosive dispersal of oil emitted from ‘cracked’ glands in the peels of citrus fruit. The jetting oil undergoes an extreme acceleration to reach velocities in excess of 10 m/s. On a slightly larger scale, the method mosquitoes use to ‘buzz’ their wings free of deposited water drops prompts a look into how flexible surfaces may be vibrated to self-dry. We find drop ejection is dependent on drop and wing properties, and wing motion in this highly-coupled system.  On yet a larger scale, the dynamics of the entry of solids into liquid baths, such as the ‘plop’ of restroom use, is heavily influenced by free surface conditions

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