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| A simple and widely applicable relation connects the Strouhal frequency, with which turbulent eddies form in a fluid flowing around a barrier, with a barrier's size and the fluid velocity. Pressure differences across a barrier arise from the Bernoulli Effect, operating in the laminar flow on one side of the barrier, and the turbulent flow on the other side, where the pressure is nearly atmospheric. These differences may resonate with some intrinsic natural frequency of the barrier causing a variety of effects from the erratic motion of millimeter-sized rain droplets to the destructuion of the original Tacoma Narrows Bridge. A demonstration of how this resonance affects electric power transmission lines on windy days will be shown. 339 Strong Hall, Noon Bring a sandwich!
Juices, soda pop, and dessert will be provided.
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