Brookfield Engineering Laboratories, Inc. Page 15 Manual No. M/85-150-N898
The ratio of (ωr) and (c) is a constant for any value of (r). Since (c) is a maximum at cone radius
(r), the shear rate is related to (ω) and sin θ.
For the Wells-Brookfield Cone/Plate Viscometer, the mathematical relationships are:
Shear Stress (dynes/cm
2
)
Shear Rate (sec
-1
)
Viscosity
(Centipoise) (mPa•s)
T
2/3 π r
3
ω
Sin θ
Shear Stress x 100
Shear Rate
=
=
Where:
T = % Full Scale Torque (dyne-cm)
r = Cone Radius (cm)
ω = Cone Speed (rad/sec)
θ = Cone Angle (degrees)
Cone Radius:
CP-40, CP-41, CP-42: 2.4 cm
CP-51, CP-52: 1.2 cm
=
Viscometer Spring Torque
Model Series (Dyne-Centimeter)
LV 673.7
RV 7,187.0
HA 14,374.0
HB 57,496.0
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