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Concentric
Cylinders
Concentric cylinder systems (or cup and
bob) are generally used for lower viscosity
samples that may not be held within the
gap of cone and plate or parallel plate
systems. (See later in this chapter for
information on setting up and using the
concentric cylinder systems.)
There are several different types including:
•
Recessed end
•
Conical end (DIN)
•
Vane
•
Double concentric.
See the following figures for examples of
concentric cylinder geometries.
The previous equations are also used for
the Vane system.
5 8
Figure 6.4
Conical End
Figure 6.3
Recessed End
The shear stress factor is the same
as the geometry shown in Figure
6.3. The conical end aids penetra-
tion and even distribution of stiffer
samples.
AR 2000 Operator's Manual
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