Environmental Engineering Reference
In-Depth Information
Fick-diffusion coeffi cient
The diffusion coeffi cient that is associated with transport of mass caused
by a difference in concentration. This is the diffusion coeffi cient we use
in most practical applications.
See Fick's law. See also Fick-diffusion coeffi cient.
Fick's law
States that the fl ux of material is proportional to the gradient of the con-
centration. The proportionality constant is the (transport or Fick) diffusion
coeffi cient.
dc
CO
2
j
=
D dz
-
CO
CO
2
2
See also Fick-diffusion coeffi cient.
Fixed bed
Adsorption process using a solid adsorption material that is fi xed in the
adsorber.
Flue gas
In this text we refer to fl ue gas as the combustion exhaust gas produced at
power plants. The composition of fl ue gas depends on what is being
burned, but it will usually consist of mostly nitrogen, carbon dioxide, and
water vapor, as well as oxygen. It may further contain small percentages of
carbon monoxide, nitrogen oxides, and sulfur oxides, or particulate matter.
Fluidized bed
Adsorption process using a solid adsorption material that is moving in the
adsorber. If a gas is fl owing through the solid at certain conditions, this
mixture can behave as a fl uid.
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