Monday , November 18 2019
Home / austria / Jump into the cookie bottle

Jump into the cookie bottle



HZDR scientist finds out a marvelous phenomenon in liquid metals

It is a turbulent problem of anyone who warms the fluid: a mixture of hot liquid and milieu, in some cases a large structure – a major formation – colleagues from the University of California at Los Angeles and Toshibas vogueNew news of dresser: "From the Helmholt-Centrum Dresden Röstorf (HZDR), it was surprising: in their experiments, this structure was similar to a coat hook. This effect will help to better understand some phenomena on the surface of the solar surface.

In experiments related to liquid gallium researchers from Dresden and California, a neck called a large blood circulation – Image © HZDR, T. Vogt

This is especially evident in a lava lamp: as the liquid is heated, the bubbles will be uprooted and become sore. Experts indicate that this system is conveying. In some cases, heat dissipation can be combined and produced as a large, expanded structure – large blood circulation.

You can see an example in the cloud of clouds. If the wind blows from a particular direction, a number of the cumulus clouds will be in dozens of miles – the cloud generates the road. The phenomenon of the Sun can also be observed: through a separate telescope, it looks to its surface and sees it as a collection of cereals. This "polarization" comes from the following: From the bottom, hot and shimmering material rises to the surface, where it sinks, and pours on the side of a grain of iron. These granites are up to 1,000 kilometers in size and only a few minutes left.

"So far, experts assume that this larger-size difference is more or less two-dimensional structures" Tobias Vogt from the HZDR Institute of Fluid Dynamics. "However, our experiment is now questioning this idea." In 2016, Helgols won a Doctorate Award and was a member of the VOAW Success Scholarship. It was taken to UCLA for three months. A test setup has been designed with local experts in Earth, Planet and Space Science. So that the large size of the large scale could be checked.

The core of the test was the size of a cube gear cube with a liquid gallium full of 30 degrees Celsius. "Heats the heat better, three times the water does not run away," says Tobias Vogat. "Conversion phenomena can be clearly seen." When the container is hot at 70 degrees Celsius, the lid will cool down to 30 degrees Celsius. This temperature difference resulted in liquid metallic melt: the rise of hot liquids.

Turbulences like streams

The group used to use special ultrasound technology to monitor the event: "Since gallium is not transparent, laser methods were not out of the question," Vogt says. "Instead, we used a procedure to help doctors use injections in blood vessels." Researchers sent an ultrasound short terminology to the container. According to the flow rate, the pulse reflects a different way, which can be measured to the sensors. With interactive simulation in the supercomputer, the triple space profiles on turbulent liquid metallic result are the result.

Skipping rope authors: (a) Average 3D visualization of streamlines in cylinder tank. With the streamline color indicating local speeds, sciping coir core stream lines can be seen around. Additionally, the color schemes of the midplane slice indicate speed, and promptly shows streamlines through line-integral convention (LIC-line-integral console technique). The jump coir wheel is shown in B, C, D and E. Show cross sections in half height. There is a vortex core vortex core low (pink) of large scale blood circulation. In B, the LCC is limited to midplane. Exit out of Midsummer. High speed (green) at C / E also shows the upper part of the upper or lower energy. Source: pnas.org/content/early/2018/11/21/1812260115

In all profiles, a large circulation can clearly identify – they remember about a stream snake. "We were surprised that this miracle was like a coir rope," Vogt explains. "It's constantly wrapped around – the structure of a massive movement and motion is clearly threefold." This creates suspicion of normal theoretical descriptions, which means that this observation should be considered a double-two-directional problem and should now be reexamined.

Finally, scientists have begun a series of computer simulation to check whether rosary structures are formed by other liquids. The result is: "This effect occurs with water," explained Toshibas Vogt. "But the water is more dimmer than liquid gallium and the heat is low, because the phenomenon is very weak."

-> sources:


Source link