(S. M. Bower)
Isopropyl Alcohol MOVIE
(S. M. Bower)
Our research group uses infrared (IR) imaging of liquid surfaces (usually water) for several things including the study of evaporation, natural convection, forced convection and mixed convection. To get started, let's look at a sample movie showing isopropyl alcohol being poured into a small tank. A schematic showing the position of the IR camera with respect to the tank is also shown. In this movie and those that follow, the field of view ranges from 2 inches to 5 inches on a side, and the gray scale is such that warm fluid is white and cold fluid is black.
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At the end of the above movie, you can see cellular structures forming. These are due to natural convection in the liquid. Note that while the liquids imaged above here are all transparent to the naked eye, they are opaque in the IR...thus, what we are seeing here are images of the liquid surface.
The following are movies, similar to the one above, but for different liquids. Also, the movies begin after the liquid has been poured into the tank. So, the development of the natural convection structures shown in the previous movie, has already occurred.
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Last Updated October 10, 2008.
