Biomedical Engineering Reference
In-Depth Information
In micromixers, the process of mixing and chemical reaction are related. Initially, mixing occurs
first and is then followed by the chemical reaction. Subsequently, both mixing and chemical reaction
occur in parallel. The ratio between the characteristic mixing time
t
mixing
and reaction time
t
reaction
is
called the Damk¨hler number:
t
mixing
t
reaction
:
mixing time
reaction time
¼
Da
¼
(2.205)
A small Damk¨hler number means reaction is much slower than mixing. Thus, the reaction rate is
determined by reaction
t
mixing
. A large Damk¨hler number means reaction is faster than mixing. The
extent of mixing determines the rate of reaction.
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