Tangential velocity () for a sphere refers to the component of velocity tangent to the surface of the sphere at a specific point. In other words, it is the velocity of a fluid or an object as it moves around the surface of the sphere, parallel to the surface.
- V of the sphere.
- is the free-stream velocity of the fluid far away from the sphere.
- is the angle between the free-stream velocity direction and the line connecting the sphere’s center to the point on its surface.