The homogenization of single phase gases or liquids with
chemical reactive components by mixing belongs to one of the oldest
basic operations applied in chemical engineering. The design of
equipment for mixing processes is still derived from measurements
of the mixing time which is related to the applied methods of
measurement and the special design of the test equipment
itself.
This book was stimulated by improved modern methods for
experimental research and visualization, for simulations and
numerical calculations of mixing and chemical reactions in micro
and macro scale of time and local coordinates. It is aimed to
improve the prediction of efficiencies and selectivities of
chemical reactions in macroscopic scale. The results should give an
understanding of the influence of the construction of different
mixing equipment on to the momentum, heat and mass transfer as well
as reaction processes running on microscopic scales of time and
local coordinates.
Newly developed methods of measurement are adjusted to the
scales of the selected special transport and conversion processes.
They allow a more detailed modeling of the mixing processes by the
formulation of an appropriate set of momentum-, heat- and mass
balance equations as well as boundary conditions in time and local
coordinates together with constitutive equations and reaction
kinetics equations as closure laws for numerical and analytical
calculations. The latter were empirically derived in the past and
therefore of limited reliability only.
The improved and more detailed modeling leads to a major
progress in predicting mixing processes on the different scales
adjusted to transport and reaction processes in molecular, micro-
and macro dimensions.
As a consequence improved numerical calculations are performed
on the basis of newly derived experimental, measurement and
modeling methods which are the basis for the prediction of mixing
time as well as conversion rates and selectivities of chemical
reactions during the mixing process. The research efforts are
focused onto the design of the technical equipment for flow mixing
processes. Mixing is performed inside velocity fields leading to
deformation gradients from free or wall induced boundary layers.
The different kinds of process equipment are jet mixer, static
mixer and mixing vessels equipped with rotating stirrers.
Especially in micro mixing newly developed constructions are
investigated permitting the scale up from laboratory to technical
dimensions.
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