Flow circulates rapidly on the surface of bubbles, visualized by iridescence caused by light wave interference.

By Shea Zmerzlikar and Jon Horneber for Spring 2013 Team First.
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Flow circulates rapidly on the surface of bubbles, visualized by iridescence caused by light wave interference.

Lights reflect on “Boo Bubbles”, fog filled soap bubbles that rest on black velvet without popping.

Boo Bubbles”, filled with CO2 and water fog, are heavier than air.”

Boo Bubbles”, fog filled soap bubbles, rest on black velvet without popping.”

Water fog from sublimating dry ice forms ‘boo bubbles’ after passing through soapy water.

Flow over an airfoil in a water flume(Re = 40,000), at varied angle of attack, visualized with food dye.

Dyed water flows over a model airfoil in a flume.

Flow over an airfoil in a water flume(Re = 40,000), at varied angle of attack, visualized with bursts of food dye.

Dyed water flows over a model airfoil in a flume.

A mixture of mineral oil and orange fluorescent tracer over fluorescent laundry detergent shows flow over an airfoil in a low speed wind tunnel.