Korea-Australia Rheology Journal

The Korean Society of Rheology (한국유변학회)
권호 표지

Yield stress measurements in suspensions: an inter-laboratory study

  • Nguyen, Q. Dzuy (School of Chemical Engineering, University of Adelaide) ;
  • Akroyd, Timothy (School of Chemical Engineering, University of Adelaide) ;
  • Kee, Daniel C. De (Department of Chemical and Biomolecular Engineering, and Tulane Institute for Macromolecular Engineering and Science, Tulane University) ;
  • Zhu, Lixuan (Department of Chemical and Biomolecular Engineering, and Tulane Institute for Macromolecular Engineering and Science, Tulane University)
  • Published : 2006.03.01
Download PDF
⟨ Previous Next ⟩

Abstract

The first international inter-laboratory study, involving six laboratories, has been conducted to examine issues associated with yield stress measurements in suspensions. The initial focus of the project was to evaluate the reliability and reproducibility of several common yield stress measuring techniques employed in different laboratories and with different instruments. Aqueous suspensions of colloidal $TiO_2$ at concentrations of 40-70 wt% solids were used as the test fluids. A wide range of instruments and techniques employing both direct and indirect methods were used to determine the yield stress of the samples prepared according to a prescribed procedure. The results obtained indicated that although variations of results existed among different techniques, direct yield stress measurements using static methods produced more reliable and repeatable results than other methods. Variability of the yield stress measured using different techniques within any laboratory however was less significant than variability of the results among different laboratories. The nature and condition of the test suspensions was identified as the most likely factor responsible for the poor reproducibility of yield stress measurements from different laboratories.

Keywords

References

  1. American Society for Testing Materials, 1999, Standard practice for conducting interlaboratory study to determine the precision of a test method, ASTM Standard E691-99
  2. Barnes, H.A., 1999, The yield stress-a review or '${\pi}{\alpha}{\nu}{\tau}{\alpha}\;{\rho}{\varepsilon}{\iota}$'- everything flows?, J. Non-Newt. Fluid Mech. 81, 133-178 https://doi.org/10.1016/S0377-0257(98)00094-9
  3. Cheng, D.C.-H., 1986, Yield stress: A time-dependent property and how to measure it, Rheol. Acta 25, 542-554 https://doi.org/10.1007/BF01774406
  4. Coussot, P. and S. Boyer, 1995, Determination of yield stress fluid behaviour from inclined plane test, Rheol. Acta 34, 534- 543 https://doi.org/10.1007/BF00712314
  5. Coussot, P., Q.D. Nguyen, H.T. Huynh and D. Bonn, 2002, Viscosity bifurcation in thixotropic, yielding fluids, J. Rheol. 46, 573-589 https://doi.org/10.1122/1.1459447
  6. James, A.E., D.J.A. Williams and P.R. Williams, 1987, Direct measurement of static yield properties of cohesive suspensions, Rheol. Acta 26, 437-446 https://doi.org/10.1007/BF01333844
  7. Liddell, P.V. and D.V. Boger, 1996, Yield stress measurements with the vane, J. Non-Newt. Fluid Mech. 63, 235-261 https://doi.org/10.1016/0377-0257(95)01421-7
  8. Nguyen, Q.D. and D.V. Boger, 1983, Yield stress measurement for concentrated suspensions, J. Rheol. 27, 321-349 https://doi.org/10.1122/1.549709
  9. Nguyen, Q.D. and D.V. Boger, 1985, Direct yield stress measurement with the vane method, J. Rheol. 29, 335-347 https://doi.org/10.1122/1.549794
  10. Nguyen, Q.D. and D.V. Boger, 1992, Measuring the flow properties of yield stress fluids, Annu. Rev. Fluid Mech. 24, 47-88 https://doi.org/10.1146/annurev.fl.24.010192.000403
  11. Steffe, J.F., 1996, Rheological Methods on Food Process Engineering, 2nd ed., Freeman Press, East Lancing
  12. Uhlherr, P.H.T., J. Guo, T.-N. Fang and C. Tiu, 2002, Static measurement of yield stress using a cylindrical penetrometer, Korea-Australia Rheology J. 14, 17-23
  13. Uhlherr, P.H.T., J. Guo, C. Tiu, X.-M. Zhang, J.Z.-Q. Zhou and T.-N. Fang, 2005, The shear-induced solid-liquid transition in yield stress materials with chemically different structures, J. Non-Newt. Fluid Mech. 125, 101-119 https://doi.org/10.1016/j.jnnfm.2004.09.009
  14. Zhu, L., N. Sun, K. Papadopoulos and D. De Kee, 2001, A slotted plate device for measuring static yield stress, J. Rheol. 45, 1105-1122 https://doi.org/10.1122/1.1392299
  15. Zhu, L., K. Papadopoulos and D. De Kee, 2002, Yield stress measurement of silicon nitride suspensions, Can. J. Chem. Eng. 80, 1175-1180 https://doi.org/10.1002/cjce.5450800619