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Co Axial Cylinder vs Pipeline Viscometer

Co Axial Cylinder vs Pipeline Viscometer

Co Axial Cylinder vs Pipeline Viscometer

(OP)
Hello,
I am currently studying the relationship of shear stress vs. shear rate using a co-axial cylinder viscometer (DIN 53019) and comparing the results to our lab pipeline viscometer. The material being tested is very fine grained tailings, approx 50% passing 20um. The consistency is considered to be non-segregating slurry, between slurry and paste consistency.

I am using the 8V/D method for pipeline shear rate, corrected using the 'n' factor determined from ln(tau)/ln(8V/D). The flow curves obtained generally follow the same trendline, but the viscometer values are less than the pipeline values. The viscometer data has been corrected for (wall slip & end effect.)

Is there a direct relationship between pipeline shear rates and viscometer shear rates? What is the recommended approach to approximate pipeline pressure losses using a co-axial cylinder viscometer?

Any help would be appreciated!

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