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Levin, Patrick [Author]; Buchholz, Moritz [Author]; Meunier, Vincent [Author]; Kessler, Ulrich [Author]; Palzer, Stefan [Author]; Heinrich, Stefan [Author] ; Technische Universität Hamburg, Technische Universität Hamburg Institute of Solids Process Engineering & Particle Technology

Comparison of Knudsen diffusion and the dusty gas approach for the modeling of the freeze-drying process of bulk food products

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  • Media type: E-Article
  • Title: Comparison of Knudsen diffusion and the dusty gas approach for the modeling of the freeze-drying process of bulk food products
  • Contributor: Levin, Patrick [VerfasserIn]; Buchholz, Moritz [VerfasserIn]; Meunier, Vincent [VerfasserIn]; Kessler, Ulrich [VerfasserIn]; Palzer, Stefan [VerfasserIn]; Heinrich, Stefan [VerfasserIn]
  • Corporation: Technische Universität Hamburg ; Technische Universität Hamburg, Institute of Solids Process Engineering & Particle Technology
  • imprint: 2022
  • Published in: Processes ; 10(2022), 3 vom: 11. März, Artikel-ID 548, Seite 1-14
  • Language: English
  • DOI: 10.15480/882.4261; 10.3390/pr10030548
  • ISSN: 2227-9717
  • Identifier:
  • Keywords: freeze-drying ; drying of frozen particles ; modeling ; dusty gas model ; improvement of mass transfer ; internal porous structure
  • Origination:
  • Footnote: Sonstige Körperschaft: Technische Universität Hamburg
    Sonstige Körperschaft: Technische Universität Hamburg, Institute of Solids Process Engineering & Particle Technology
  • Description: Freeze-drying is generally used to achieve high quality products and preserve thermal sensitive components; however, it is also considered as a high energy and costly process. Modeling of the process can help to optimize the process to reduce these drawbacks. In this work, a mathematical model is presented to predict the heat and mass transfer behavior for freeze-drying of porous frozen food particles during freeze-drying to optimize the process. For the mass transfer, a comparison between Knudsen diffusion and the more complex dusty-gas approach is performed. Simulation results of a single particle are validated by experiments of single-layer drying to extend the usage of this model from a single particle to a particle bed. For the moisture transfer, adaption parameters are introduced and evaluated. A comparison shows a good agreement of the model with experimental results. The results furthermore suggest a strong correlation of the drying kinetics with pore size and particle porosity. An increase in the pore diameter strongly improves the overall mass transfer rates and hence is a suitable parameter for an effective increase of the drying rates in freeze-drying.
  • Access State: Open Access
  • Rights information: Attribution (CC BY)