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Journal of Undergraduate Research

Keywords

egg spinning, milk, spinning cone, eggs in milk

College

Ira A. Fulton College of Engineering and Technology

Department

Mechanical Engineering

Abstract

If an egg spinning on a counter-top passes through a shallow pool of milk, a thin film of milk will be drawn up the sides of the egg and sprayed on the counter-top. This phenomenon is not limited to eggs or milk. In fact, when any axis-symmetric object is spun in a shallow bath of fluid, this phenomenon occurs in which fluid flows up the object and is then ejected at the maximum radius. This phenomenon lends itself well as a pump for moving fluids from very shallow areas to other regions and can even be used to make droplets of specific sizes quickly, as opposed to using gravity and capillary tubes. Several industrial processes use this phenomenon to produce small droplets of liquid. For instance, typical off-the-shelf humidifiers use a spinning cone to draw fluid up the cone from a bath to spray small droplets that evaporate quickly, thus humidifying the air. This phenomenon is quite complex and previous research efforts have not fully explained the physical mechanisms that cause it.

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