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Excluding Shear Contributions to Extensional Viscosity on Power Law Fluids

Posted by Grace on Apr 8, 2015 3:59:00 PM

In Viscosity Measurements, Applications

Manufacturing processes often present combination of extensional and shear flows. 

Process prediction and optimization requires rheological characterization and understanding of the specific materials behavior. RheoSense's extensional viscometer, e-VROC®, provides a valuable tool to study and understand the elastic behavior of viscoelastic fluids that are ubiquitous in industrial processes. 

Extensional Viscometer Flow Channel

Figure 1: Extensional flow through a hyperbolic contraction microfluidic channel. 
T. J. Ober, "Microfluidic extensional rheometry usin a hyperbolic contraction geometry," Rheologica Acta, 2013. 

Our latest application note explains the few steps necessary to combine, extensional viscosity and shear viscosity measurements in order to make the former shear free. 

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