Why golf balls have dimples?

1 .Originally, the ball was round and smooth without dimples, but by chance, it was found that the ball with holes actually flew farther than the ball with a smooth surface. According to the data, for example, a person who can hit a golf ball 200 meters away with the status quo, can hit a ball with a smooth surface in the same way, and it will only reach 40 meters. Another reason for making the ball concave is that it can generate lift due to rotation.

 

2. The rounded surface was thought to have less air resistance and would fly farther, but how could it be the other way around? The golf ball is placed in the air flow, must be surrounded by a thin layer of interface. At this point, the round ball, the air interface layer is easy to peel off, and in the back of the ball to produce air vortex, so that the back of the pressure is reduced, the ball in front of the pressure is more, so the pressure difference leads to a drop in ball speed. In contrast, the ball with a hole, because the interface layer is not easy to peel off, the force behind the ball does not drop much, so the ball flies farther.

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