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Assume that locally the velocity distribution
in the gap can be very closely approximated by that for flow between parallel plates, the upper one moving with a constant speed. Verify that this leads to the approximate velocity distribution
(in spherical coordinates) this approximation should be rather good, because ψ0 is so small.
(b) From the velocity distribution
in Eq. 2B.11-1 and Appendix B.1, show that a reasonable expression for the shear stress is this result shows that the shear stress is uniform throughout the gap. It is this fact that makes the cone-and-plate viscometer quite attractive. The instrument is widely used, particularly in the polymer industry.
(c) Show that the torque required to turn the cone is given by This is the standard formula for calculating the viscosity from measurements of the torque and angular velocity for a cone-plate assembly with known R and ψ0.
(d) For a cone-and-plate instrument with radius 10 cm and angle ψ0 equal to 0.5 degree, what torque (in dyn ∙ cm) is required to turn the cone at an angular velocity of 10 radians per minute if the fluid viscosity is 100 cp?
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