2022-01-13 Scientists' studies have shown that under the same conditions and the same force, the resistance of a golf ball with a rough surface in flight is only half that of a golf ball with a smooth surface, and the flying distance can even reach the distance of a ball with a smooth surface. 5 times. There is such a physical principle behind this phenomenon.
When an object moves in the air, it is mainly subjected to two kinds of forces, one is the frictional resistance generated by the surface of the object and the airflow, which we all know, and the other is the pressure difference resistance caused by the air pressure difference between the front end and the rear end of the object. To put it figuratively, for example, when the spacecraft is returning to the atmosphere, due to its very fast speed, the front end of the spacecraft collides and rubs with the atmosphere violently, resulting in huge pressure; while the air behind the spacecraft is pushed away, and according to the principle of gas pressure, the pressure behind it decreases. , resulting in a backward pressure differential, this force is the differential pressure resistance. The function of the small pits on the golf ball surface is to tightly fit the surface air to the spherical surface, so that the air resistance of the rear whirling becomes smaller, and the golf ball can fly farther and faster.
In addition, it also involves a certain knowledge of fluid mechanics. We refer to liquids and gases collectively as fluids. During the flight of an object or aircraft in the air, the air around the object will form a thin layer of special space environment, which is called the flow field. There are two types of fluid flow in the flow field, turbulent flow and laminar flow. The critical point at which an object flying in the air changes from chaotic turbulent flow to a smooth laminar state is greatly affected by the roughness of the object's surface. Reduce wobbles and falls so the golf ball can fly farther.