Experimental Methods and Results
We saw in § 12 that three material functions, η, σ1, σ2, determine the behavior of an incompressible simple fluid in viscometric flows. In the previous chapter these material functions were related to measurable quantities such as velocities, volume discharges per unit time, angular velocities, applied forces and torques, differences of normal thrusts, etc. Without attempting an exhaustive summary, we here discuss practical methods of determining η, σ1, σ2.
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