What is the principle of floating grain rings in milk?

What is the principle of floating grain rings in milk? Let's discuss this problem below, hoping that these contents can help friends in need.

A research team at Brown University has developed a method to measure the force in this situation. They show that this is the first time to measure this force experimentally at the limit of mm/cm. The requirements of this work far exceed the scope of studying the early rice bowl, and the result may be beneficial to the product development of small equipment.

The creator IanHo said: "There have been many theoretical models to discuss the utility of this particle ring, but no one has done all the experiments to measure and certify this solid model." The utility of the grain ring comes from the interaction between the acting force and the surface supporting force. Something as small as a cereal ring is not heavy enough to get rid of the surface support of milk, so it will float on the milk. But the net weight of the two does create a small pit on the surface plastic film, so when the distance between the pits is close enough, they will collide with each other and finally produce a ball on the surface of the milk.

In order to better detect the compressive strength caused by round particles and other substances with similar size and net weight, the researchers applied a customized instrument and equipment to measure the force through magnetism. This experiment consists of two plastic disks the size of a rice grain, one of which is equipped with a small magnet and floats on an iron drum. When another magnetized hard disk is in the right position, the electromagnetic field can pull it down. According to the magnetic field intensity measured when the hard disks are gradually moving towards each other, researchers can determine the magnitude of the attraction.

Harris said: "Electromagnetic fields give us a non-mechanical way to react to such objects. The necessity of this method is that since the force measured by everyone is similar to the weight of mosquitoes, once my body encounters it, it will affect their movement. "

Experiments show that the traditional mathematical analysis model of interaction actually underestimates the temptation of disk approach. At first, the researchers were not sure what happened until they noticed that as the two disks got closer, they gradually tilted towards each other. Tilting makes the disc push the liquid surface closer to the offline liquid more forcefully, thus improving the force of pushing back the liquid. The extra driving force makes the attraction in the middle of the disc slightly higher.

Harris said: "People realize that people's physical models are not detailed enough, and there is still a lack of a standard, which is this skew. This is the meaning of shuttling back and forth between concept and research. " Researchers show that this discovery is beneficial to the product development of micro-robots. If you have many small machines moving on many legs of a robot, you must also know what force they exert on both sides. This is an interesting research industry.