aquaplaning

A well known example of hydrodynamic lubrication is the aquaplaning of automobile tires on wet roads. The water is dragged by the tire into the wedge shaped geometry formed between the tire and the road surface, causing hydrodynamic pressure to build up at the front of the tire. When the pressure is high enough to separate the tire from the road with a thin film of water, the tire loses almost all its grip and slippage is unopposed. To increase the speed at which aquaplaning might occur angled groove patterns effectively disperse the water from the contact patch.

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