MRI Viscometer

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Fig. 4.2.9 Viscosity versus shear rate obtained using a cone and plate viscometer (a) and MRI ( ) 13 mLs"1, ( ) 22 mL s-. ...

Magnetic resonance imaging has enabled the development of a completely novel type of viscometer. This technique is based on the capacity of MRI to accurately measure velocity profiles in opaque liquids. Its potential applications include many systems of industrial relevance, such as polymer melts and slurries. The data presented here clearly show that a wide range of fluid behaviors can be measured. 

Fig. 4.7.9 MRI apparent viscosity-shear rate data in comparison with a conventional rotational viscometer shear viscosity-shear rate data. (Permission granted to reprint Figure 4 on page 517 in Ref. [49].)...

The MRI-based viscosity measurement relies on local calculations of the velocity gradient based on using MRI velocity profiles to provide a wide range of shear viscosity-shear rate data. Two observations are used to characterize fully developed and steady laminar flow in a MRI-based viscometer the velocity profile and the pressure drop per unit tube length measurements. Viscosity measurements were acquired on strawberry milk samples using H P LG tubing for the sample channel. 

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