OPTIONS: Shot-peen
Shot peening is a cold working non-directional process in which the surface of a part is bombarded with small spherical media called shot. Each piece of shot striking the material acts as a tiny peening hammer, imparting to the surface a small indentation or dimple. The resulting dimple may serve to disrupt the boundary layer of the flow creating turbulence and the tendency of particles to tumble along the wall of the pipe or tubing
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