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Concentration of Tracers into Island Chains
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Concentration of Tracers into Island Chains

June 23, 2010
Concentration of Tracers into Island Chains This detailed image from a double-injection fluorescent dye experiment in a stirred tank of a design common in chemical and pharmaceutical processing. To the right of the image is an impeller (not visible) that creates a large flow torus identified by the green fluorescent dye. The green dye has the same density as the mixing fluid. The red dye, on the other hand, is very weakly buoyant in the mixing fluid, and becomesspontaneously--highly concentrated in island chains surrounding the main torus. This concentration of weakly buoyant materials is significant both for industrial materials and, potentially, for environmental contaminants in the atmosphere. This work was performed at the Center for Structured Organic Composites (C-SOC), a National Science Foundation Engineering Research Center (ERC) based at Rutgers University. The center was established to study the nature of finely ground granular materials and other substances that form the core of drug tablets, processed foods, agricultural chemicals and other "composite organic" products. In addition to improving the quality and consistency of such materials, the center will develop more consistent and cost-effective manufacturing techniques than methods based largely on trial and error. To learn more about work at this center, visit the C-SOC Web site. Further information about the NSF Engineering Research Centers program, including a list of the centers currently funded and links to their Web sites, is available at http://www.nsf.gov/funding/pgm_summ.jsp?pims_id=5502. (Date of Image: unknown) [One of several related images. See Next Image.]