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In physics, chemistry, biology and engineering, a transport phenomenon is any of various mechanisms by which particles or quantities move from one place to another. The laws which govern transport connect a flux with a "motive force". Three common examples of transport phenomena are diffusion, convection, and radiation.
Additional recommended knowledge
There are three main categories of transport phenomena:
An important principle in the study of transport phenomena is analogy between phenomena. For example, mass, energy, and momentum can all be transported by diffusion:
The transport of mass, energy, and momentum can also be affected by the presence of external sources:
All these effects are described by the generic scalar transport equation.
The same equations governing convection in heat transfer can be applied to convection in mass transfer. When studying complex transport phenomena problems one must use tools from continuum mechanics and tensor calculus and often problems can be expressed as partial differential equations.
In solid state physics, the motion and interaction of electrons, holes and phonons are studied under "transport phenomena".
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Transport_phenomena". A list of authors is available in Wikipedia.|