Measurement Errors in Yield Stress Rheometry that Arise from Torque Auto Zero

Applied Rheology

Scales Peter J.¹  Fisher Daniel T.¹  Boger David V.¹ 

[1] Particulate Fluids Processing Centre, Department of Chemical and Biomolecular Engineering, University of Melbourne, Victoria, 3010, Australia;

关键词: yield stress;    suspension rheology;    vane rheology;    concentrated suspensions;    particles;   

DOI  :  10.1515/arh-2006-0015

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown