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Jorg Baller, Christian Wagner, Patrice RooseAuthor index ►
Joint Symposium Rheology - 360° of the Belgian Group of Rheology, German Rheological Society, and ProcessNet-Subject Division Rheology
Appl. Rheol. 28:3 (2018) 53-53 ►
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Baller J, Wagner C, Roose P: Joint Symposium Rheology - 360° of the Belgian Group of Rheology, German Rheological Society, and ProcessNet-Subject Division Rheology, Appl. Rheol. 28 (2018) 53.
While shear thickening is a well-known feature of some polymer solutions, its observation in the absence of a clear specific chemical or structural mechanism and at very low rates of shear (shear rate ≤ 0.1/s) in our own data, as well as in several polymer systems in the literature, has prompted further investigation. Using the rheologically-reproducible and commercially available dysphagia product ResourceÒ Thicken Up Clear (produced by Nestle Health Science) as a canonical demonstration fluid, we show that the observation of a local maximum in the steady shear viscosity at very low shear rates can be completely attributed to the sample not having reached steady state conditions, and correspondingly, to the measurement not having been performed in steady simple shear flow. We propose two criteria to ensure equilibration during steady state flow rheological measurements: a substantial increase in the measurement time allotted for each point such that the total material strain accumulated in the sample is allowed to reach shear strain ≤ 5 and/or a stricter convergence criterion of 10 consecutive readings within a tolerance of 1%.► Cite this publication as follows:
Wagner CE, Barbati AC, Engmann J, Burbidge AS, McKinley GH: Apparent shear thickening at low shear rates in polymer solutions can be an artifact of non-equilibration, Appl. Rheol. 26 (2016) 54091.
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Wagner C: Workshop of the German Rheological Society (DRG) and the ProcessNet Section Rheology, Appl. Rheol. 26 (2016) 59.
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Wagner C: Joint Focus Session Rheology of the German Rheological Society (DRG) together with the German Physical Society (DPG), Appl. Rheol. 22 (2012) 213.Christian Wagner
Rheologentagung 2009 Berlin
Appl. Rheol. 19:3 (2009) 179-179 ►
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Wagner C: Rheologentagung 2009 Berlin, Appl. Rheol. 19 (2009) 179.
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Wagner C: Microrheology and Rheological Phenomena in Microfluidics 2006 Workshop of the German Rheological Society (DRG) , Appl. Rheol. 17 (2007) 42.
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