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A spoon will be used to stir when drinking instant coffee or something like that. However, it is inconvenient to carry a spoon in cups with capping, so we often encounter situations when we could not find a spoon or the spoon handle is too short to use. With the inner spiral structure of the cup (spiral counterclockwise in the northern hemisphere, southern hemisphere clockwise spiral), it works by enhancing the directed weak disturbance of Coriolis force, guiding the water flow along the spiral flow, increasing the impact force, thus forming an automatic vortex. Therefore, stirring can be done without stirring spoon.
Xi Chen,Renjie Yang,Liewen Huang,Jian Li