Daniel T. Fisher, David V. Boger, Peter J. Scales
Measurement errors in yield stress rheometry that arise from torque auto zero
Appl. Rheol. 16:4 (2006) 206-209Abstract: The measurement of the shear rheology of concentrated particulate suspensions is important to a range of mixing, pumping and flow operations. The use of a four or six bladed vane attached to a rheometer in an open cup is a popular technique to achieve a rheological characterisation. A problem occurs in the use of automated software with a number of rheological devices for yield stress materials. A torque auto zero default causes the torque at the start of a test to be ignored, and can result in significant errors and underestimation of the yield stress or rheological response of the suspension. The potential effect of using a torque auto zero default is demonstrated for a concentrated particulate suspension of nickel laterite. © 2006 Applied Rheology.
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