Examples of localised aeration include air entrainment by plunging water jet and at hydraulic jump.
Bubbles are entrained locally at the intersection of the impinging jet with the surrounding waters.
Interfacial aeration is defined as the air entrainment process along an air–water interface, usually parallel to the flow direction.
The air bubble entrainment may be localised or continuous along an interface (water jets, spillway chutes).
Despite recent advances, there are some basic concerns about the extrapolation of laboratory results to large size prototype structures.