Microfluidic extensional rheometry using a hyperbolic contraction geometry
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McKinley_Microfluidic extensional.pdf
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Author(s)
Ober, Thomas Joseph
Haward, Simon J.
Pipe, Christopher J.
Soulages, Johannes
McKinley, Gareth H.
Date Issued
May 2013
Journal
Rheologica Acta
Publisher
Springer-Verlag
Citation
Ober, Thomas J., Simon J. Haward, Christopher J. Pipe, Johannes Soulages, and Gareth H. McKinley. “Microfluidic Extensional Rheometry Using a Hyperbolic Contraction Geometry.” Rheologica Acta 52, no. 6 (May 18, 2013): 529–546.
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Author's final manuscript
Abstract
Microfluidic devices are ideally suited for the study of complex fluids undergoing large deformation rates in the absence of inertial complications. In particular, a microfluidic contraction geometry can be utilized to characterize the material response of complex fluids in an extensionally-dominated flow, but the mixed nature of the flow kinematics makes quantitative measurements of material functions such as the true extensional viscosity challenging. In this paper, we introduce the ‘extensional viscometer-rheometer-on-a-chip’ (EVROC), which is a hyperbolically-shaped contraction-expansion geometry fabricated using microfluidic technology for characterizing the importance of viscoelastic effects in an extensionally-dominated flow at large extension rates (λ[. over ε][subscript a] ≫ 1, where λ is the characteristic relaxation time, or for many industrial processes . over ε][subscript a] ≫ 1 s[superscript −1]). We combine measurements of the flow kinematics, the mechanical pressure drop across the contraction and spatially-resolved flow-induced birefringence to study a number of model rheological fluids, as well as several representative liquid consumer products, in order to assess the utility of EVROC as an extensional viscosity indexer.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Hatsopoulos Microfluids Laboratory
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DOI of Published Version
https://doi.org/10.1007/s00397-013-0701-y
