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Shear localisation in stirred yoghurt

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Abstract

The shear flow behaviour of stirred yoghurt in the cone-and-plate and cylindrical Couette geometries was studied using diffusing wave spectroscopy (DWS) and nuclear magnetic resonance (NMR) velocimetry. Differences between the transmission and backscattering DWS correlations suggest the formation of a high shear rate band near the surface of a moving cone of a cone-and-plate geometry at low shear rates. At higher shear rates, homogeneous shear flow is indicated. NMR velocimetry unambiguously demonstrated that a high shear rate band forms at the moving inner wall of a cylindrical Couette geometry at low shear rates. At intermediate shear rate, a high shear rate band is formed at the stationary outer wall and plug-like flow is observed mid-gap. At higher shear rates, homogeneous shear flow is observed. Slip is seen at both walls. The three flow regimes appear to correlate loosely with transitions in the pseudo-steady-state flow curve and may reflect a break-up of the protein aggregates observed with confocal microscopy.

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Acknowledgements

The authors thank Aurélie Cucheval, Institute of Fundamental Sciences, Massey University, New Zealand for the confocal microscopy measurements. The NMR velocity measurements were performed in the Rheo-NMR Facility operated by Prof. Paul Callaghan at Victoria University of Wellington, New Zealand. Allan Raudsepp thanks the Royal Society of New Zealand for funding and Kirk Feindel thanks the Natural Sciences and Engineering Research Council of Canada for a post-doctoral fellowship.

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Authors and Affiliations

  1. The MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, Wellington, New Zealand

    Allan Raudsepp & Kirk W. Feindel

  2. Food Science Australia, Werribee, Victoria, Australia

    Yacine Hemar

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  1. Allan Raudsepp
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  2. Kirk W. Feindel
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  3. Yacine Hemar
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Correspondence to Allan Raudsepp.

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Raudsepp, A., Feindel, K.W. & Hemar, Y. Shear localisation in stirred yoghurt. Rheol Acta 49, 371–379 (2010). https://doi.org/10.1007/s00397-010-0438-9

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  • DOI: https://doi.org/10.1007/s00397-010-0438-9

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