Quantifying the errors due to overfilling for Newtonian fluids in rotational rheometry

Ruth Cardinaels (Corresponding author), Naveen Krishna Reddy, Christian Clasen

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The errors on rheological measurements due to overfilling of Newtonian fluids using parallel plate and cone-plate setups in rotational rheometry are quantified. Overfilled sample causes an additional drag force, thereby increasing the measured viscosity, especially when the sample wets the geometry rim. This can cause errors up to 30% in standard experimental setups such as parallel plates with a gap height of 1 mm. This viscosity error increases proportionally with the ratio of gap height to radius of the geometry. By developing a scaling relation that captures the main effects of the geometrical parameters on the viscosity error due to overfilling, a master curve was constructed for the viscosity error as a function of the amount of overfilling. Our systematic analysis of the viscosity error due to overfilling can be utilized to correct for this error during rheological measurements in which overfilling is known but unavoidable or desired.

Overfilling Edge effects Rotational rheometry Shear viscosity
Original languageEnglish
Pages (from-to)525-538
Number of pages14
JournalRheologica Acta
Issue number8
Publication statusPublished - Aug 2019


  • Edge effects
  • Overfilling
  • Rotational rheometry
  • Shear viscosity


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