RH 13: Recommended Procedures
RH 13: Recommended ProceduresPart 1: Coaxial cylinder viscometry
1. Introduction
2. Viscometer setup
2.1 Torque calibration
2.1.1 Controlled rate coaxial cylinder viscometer
2.1.2 Controlled stress coaxial cylinder viscometer
2.2 Speed calibration
2.3 Dimensional errors
2.4 Misalignment errors
3. Sample handling and conditioning
3.1 Obtaining representative samples
3.2 Placement of sample
3.3 Temperature control
4. Flow curve data generation
4.1 Checking for time-dependent flow behaviour
4.2 Obtaining the flow curve
4.2.1 Cautionary note
4.2.2 Step-by-step procedure
5. Obtaining the corrected flow curve
5.1 Secondary Flow
5.1.1 Theoretical criterion to identify the primary laminar flow breakdown limit
5.1.2 Experimental method to determine the secondary flow effect
5.2 Viscous heating
5.2.1 Theoretical criterion to identify the viscous heating limit
5.2.2 Experimental method to determine the viscous heating effect
5.3 End effect
5.3.1 Minimisation of end effect
5.3.2 Experimental determination of end effect
5.3.3 Prediction of end effect
5.4 Wall slip effect
5.4.1 Elimination of wall slip
5.4.2 Experimental determination of wall slip velocity
6. Overall step-by-step calculation procedure
6.1 Initial setup of the viscometer
6.2 Sample handling and conditioning
6.3 Flow curve data generation
6.4 Obtaining the flow curve
6.4.1 Correcting T versus W data
6.4.2 Calculation of shear stress and shear rate to obtain the flow curve
7. Nomenclature
8. References