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Optimal Design of Complementary Experiments for Parameter Estimation at Elevated Temperature of Food Processing.

Patnarin Benyathiar1, Kirk D Dolan2, Dharmendra K Mishra3

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This study optimized complementary experiments for simultaneously estimating temperature-dependent thermal conductivity and volumetric heat capacity. A novel heating profile accurately determined these properties for sweet potato puree.

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Area of Science:

  • Food science and technology
  • Thermal property measurement
  • Material characterization

Background:

  • Simultaneous estimation of temperature-dependent thermal properties is complex.
  • Complementary experiments can aid in estimating thermal conductivity.
  • Optimizing these experiments is crucial for accurate property determination.

Purpose of the Study:

  • To optimize complementary experiments for simultaneous estimation of temperature-dependent thermal conductivity and volumetric heat capacity.
  • To investigate various heating profiles for maximizing experimental data.
  • To accurately determine thermal properties of sweet potato puree.

Main Methods:

  • A theoretical study was conducted using a cylindrical sample holder with a central thin film heater.
  • Two experimental phases were employed: a constant boundary temperature phase and a controlled heating phase.
  • Sinusoidal heating profiles were investigated to optimize data acquisition.

Main Results:

  • The sinusoidal heating profile proved most effective for maximizing information from complementary experiments.
  • Temperature-dependent thermal conductivity of sweet potato puree ranged from 0.509 to 0.629 W/mK (25-140 °C).
  • Temperature-dependent volumetric heat capacity ranged from 3.617 × 10^6 to 4.180 × 10^6 J/m^3K (25-140 °C), with low standard errors.

Conclusions:

  • Optimized complementary experiments enable accurate simultaneous estimation of temperature-dependent thermal properties.
  • The developed method is effective for characterizing food materials like sweet potato puree.
  • This approach advances the precise measurement of thermal properties in complex materials.