Whether you are familiar with the term 'Magnus effect' or not, you have certainly seen it in action. It is when a spinning ball—for instance in football, cricket or baseball—bends away from its expected trajectory, often to the surprise of the opposing team. The principle also has engineering uses, for example to propel certain types of ships or aircraft using a 'Flettner rotor.'
The cause of the Magnus effect is a local compression of the structure of the viscoelastic fluid , which shifts to the side when the particle rotates and generates a force perpendicular to the direction of movement. Credit: Niklas Windbacher, Bechinger
These findings could be used to develop new mechanisms to move and precisely control microscopic particles. Another potential application could be mini-robots that move through the bloodstream and target specific places in the body. The results were published inThe Magnus effect can usually be observed whenever a rotating object moves through air or a liquid.
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