Brookfield Dial Viscometer Manual de usuario Pagina 15

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Brookfield Engineering Laboratories, Inc. Page 15 Manual No. M/85-150-P700
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
)= T
2/3 π r
3
Shear Rate (sec
-1
)=
ω
Sin
θ
Viscosity (centipoise or mPa•s) = 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)
Angle Radius
Cone Spindle (deg.) (cm)
CP-40 or CPE-40 0.8 2.4
CP-41 or CPE-41 3.0 2.4
CP-42 or CPE-42 1.565 2.4
CP-51 or CPE-51 1.565 1.2
CP-52 or CPE-52 3.0 1.2
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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