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Imaging reveals that flukeprints are hydraulic white holes - Hydraulic Power Generator Manufacturer by na b
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Imaging reveals that flukeprints are hydraulic white holes - Hydraulic Power Generator Manufacturer by NA B
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| Article Posted: 01/06/2013 |
| Article Views: 41 |
| Articles Written: 2638 - MORE ARTICLES FROM THIS AUTHOR |
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Imaging reveals that flukeprints are hydraulic white holes - Hydraulic Power Generator Manufacturer |
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Business,Business News,Business Opportunities
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Flukeprints are the giant circular patterns that whales leave onthe surface of the ocean as they disappear beneath the waves.Researchers have long known that they are caused by turbulence fromthe whale's tail or fluke. But exactly how this turbulence creates these beautifulpatterns has never been properly understood. Now Germain Rousseaux at the Universite de Nice-Sophia Antipolis inFrance says he's solved the mystery using the results from a uniqueset of experiments in which he uses an artificial fluke in a tankof water to recreate the patterns. He then videoed the way these patterns form and disperse using alaser imaging technique called particle imaging velicometry. Thisshines a laser beam off tiny particles in the water to see how theymove.
The result is a 3D video image of the resultant flow. Flukeprints tend to be circular or ovoid and contain a centralregion that is smooth compared the surrounding water. It's almostas if something is flattening the water in this region, preventingthe nearby surface waves from penetrating. The explanation turns out to be remarkably simple and fascinating.The key is to think about the pattern of water that forms in akitchen sink when you leave the tap on.
The steady stream of waterhits the sink surface and spreads out in a circular patternsurrounded by a rim called a hydraulic jump, like the one below. Rousseaux says flukeprints are essentially hydraulic jumps causedby jets of water from beneath the surface. As the whale submerges, its flukes generate powerful vortices inthe water. In the centre of the vortices, water is forced upwardshitting the surface from below, like a jet.
This creates the jump,which is the circular rim around the flukeprint. One of the curious properties of hydraulic jumps is that they are'white holes', the time reversed equivalent of black holes. White holes are special because they can emit waves and particlesbut do not allow them to enter, as we discussed in this post a couple of years ago . It's exactly this process that creates the region of perfect calmat the centre of the flukeprint. That's a fascinating explanation.
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