How is the austausch coefficient used to describe transport in turbulent fluids?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

The austausch coefficient is used in fluid mechanics to describe the transport of components within a turbulent fluid. It represents the proportionality between the rate at which a component (like heat, momentum, or a dissolved substance) is transported and the rate of change in its density.

In turbulent flow, eddies cause erratic motions that greatly increase the transport rate of momentum and other components compared to what would be predicted by viscosity alone. The austausch coefficient quantifies this enhanced transport.