Pingie: HTTP:: How to Prevent Teapots from Dripping

HTTP:: How to Prevent Teapots from Dripping
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For people serving tea on a regular basis, the teapot effect is well known. It appears when the liquid dribbles at low flow rates, causing numerous tea stains on table covers and clothes. Now, experts in France have managed to determine the root cause of this peculiar effect and also to come up with a way of addressing it. The investigators say that they have discovered a way of linking the small world of hydrophobic materials and effects to the large world of fluid dynamics, where inertia is king. When you pour tea from a kettle, it first begins to flow rapidly, and then, as the pressure drops, so does the flow rate. As this happens, the liquid starts taking the shape of the kettle, and then flowing on the sides of the container. The team of experts, led by scientists at the University of Lyon Laboratoire PMCN, and the Ecole Polytechnique LadHyX, has determined that, by coating the spout of the teapot with a super-hydrophobic coating, such as, for instance, with black s!
oot, the liquid flow stops dribbling and running along the sides of the kettle. “Over the recent years, the development of super-hydrophobic materials, exhibiting the so-called Lotus effect, has stirred up the physics of surfaces. Their exceptional water repellency results from the combination of bare hydrophobicity and micro- or nano- st...
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http://news.softpedia.com/news/How-to-Prevent-Teapots-from-Dripping-125869.shtml
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