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Use of rheological plastic models to describe the flow behaviour of unconventional chocolate masses

Author

Listed:
  • Veronika Kouřilová

    (Department of Food Technology, Faculty of AgriSciences, Mendel University in Brno, Brno, Czech Republic)

  • Renáta Dufková

    (Department of Food Technology, Faculty of AgriSciences, Mendel University in Brno, Brno, Czech Republic)

  • Luděk Hřivna

    (Department of Food Technology, Faculty of AgriSciences, Mendel University in Brno, Brno, Czech Republic)

  • Vojtěch Kumbár

    (Department of Technology and Automobile Transport (section Physics), Faculty of AgriSciences, Mendel University in Brno, Brno, Czech Republic)

Abstract

The chocolate mass behaves like a typical non-Newtonian plastic liquid defined by the yield stress and the plastic shear stress. The rotary rheometer with a cone-plate spindle system was chosen to determine the flow properties of chocolate masses. The effect of shear stress on shear deformation rates was measured at a temperature of 40 °C in an ascending mode from 1 s-1 to 500 s-1 for chocolate samples [white chocolate (WC), ruby chocolate (RC), and caramelised Amber chocolate (AC)]. Plastic models, according to Casson, Bingham and Herschel-Bulkley, were used for the mathematical description of this dependence. The Herschel-Bulkley model was evaluated as the most suitable mathematical model for describing the flow behaviour of unconventional chocolate masses. The Herschel-Bulkley model was chosen based on a high value of the coefficient of determination R2 and a low value of the sum of the square error estimate (SSE). The non-Newtonian plastic behaviour was confirmed, and the yield stress was determined for all types of tested chocolate masses.

Suggested Citation

  • Veronika Kouřilová & Renáta Dufková & Luděk Hřivna & Vojtěch Kumbár, 2022. "Use of rheological plastic models to describe the flow behaviour of unconventional chocolate masses," Czech Journal of Food Sciences, Czech Academy of Agricultural Sciences, vol. 40(4), pages 305-312.
    • Handle: RePEc:caa:jnlcjf:v:40:y:2022:i:4:id:57-2022-cjfs
    DOI: 10.17221/57/2022-CJFS
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