Movement
Usually, as a plume moves away from its source, it widens because of entrainment of the surrounding fluid at its edges. Plume shapes can be influenced by flow in the ambient fluid (for example, if local wind blowing in the same direction as the plume results in a co-flowing jet). This usually causes a plume which has initially been 'buoyancy-dominated' to become 'momentum-dominated' (this transition is usually predicted by a dimensionless number called the Richardson number).
Read more about this topic: Plume (hydrodynamics)
Famous quotes containing the word movement:
“An actor rides in a bus or railroad train; he sees a movement and applies it to a new role. A woman in agony of spirit might turn her head just so; a man in deep humiliation probably would wring his hands in such a way. From straws like these, drawn from completely different sources, the fabric of a character may be built. The whole garment in which the actor hides himself is made of small externals of observation fitted to his conception of a role.”
—Eleanor Robson Belmont (1878–1979)
“She had to lean away.
She dared not stir a foot,
Lest movement should provoke
The demon of pursuit
That slumbers in a brute.”
—Robert Frost (1874–1963)
“The writer may very well serve a movement of history as its mouthpiece, but he cannot of course create it.”
—Karl Marx (1818–1883)