Dynamic Modelling and Simulation of Liquid Food Process Lines

Tomas Skoglund

Research output: ThesisDoctoral Thesis (compilation)

1359 Downloads (Pure)


In the present work a dynamic model library of components for process lines was developed. The analysis addressed characteristic aspects of liquid food process lines, and new models were developed for fluid transitions, dispersion, mixing zones and first-order chemical reactions in pipes and heat exchangers. The computational efficiency and accuracy of the models were analysed. It was demonstrated that classical models of fluid propagation in process lines could be combined with modern numerical methods to obtain computationally efficient dynamic models for the simulation of dispersed convective flow, with and without chemical reactions.

In particular it was demonstrated that a transport delay model was well suited for the simulation of thermal transients due to fluid transitions in heat exchangers. It was shown that the model could be extended to account for dispersion with a method that, although classical in approach, enables a certain freedom in the choice of degree of discretization depending on the demand for accuracy vs. computational speed. Further extension of the model with first-order chemical reactions to account for microbial deactivation was demonstrated.

The usefulness of the dispersed-convection model to predict the extent of mixing zones and the amount of product rejects in continuous processing was demonstrated. The relevance concerning product traceability is discussed and the concept ?fuzzy traceability? introduced.
Original languageEnglish
Awarding Institution
  • Department of Food Technology, Engineering and Nutrition
  • Dejmek, Petr, Supervisor
Award date2007 Jun 12
ISBN (Print)978-91-976695-1-1
Publication statusPublished - 2007

Bibliographical note

Defence details

Date: 2007-06-12
Time: 13:00
Place: Lecture Hall B, Center of Chemistry and Chemical Engineering, Getingevägen 60, Lund, Sweden

External reviewer(s)

Name: de Prada Moraga, César
Title: Professor
Affiliation: Dpt. of Systems Engineering and Automatic Control, Universidad de Valladolid, c/ Real de Burgos s/n.


<div class="article_info">Tomas Skoglund, Karl-Erik Årzén and Petr Dejmek. <span class="article_issue_date">2006</span>. <span class="article_title">Dynamic object-oriented heat exchanger models for simulation of fluid property transitions</span> <span class="journal_series_title">International Journal of Heat and Mass Transfer</span>, <span class="journal_volume">vol 49</span> <span class="journal_pages">pp 2291-2303</span>. <span class="journal_distributor">ELSEVIER</span></div>
<div class="article_info">Tomas Skoglund and Petr Dejmek. <span class="article_issue_date">2007</span>. <span class="article_title">Adynamic object-oriented model for efficient simulation of fluid dispersion in turbulent flow with varying fluid properties</span> <span class="journal_series_title">Chemical Engineering Science</span>, <span class="journal_volume">vol 62</span> <span class="journal_pages">pp 2168-2178</span>. <span class="journal_distributor">ELSEVIER</span></div>
<div class="article_info">Tomas Skoglund and Petr Dejmek. <span class="article_issue_date"></span>. <span class="article_title">A dynamic object-oriented model for efficient simulation of microbial reduction in dispersed turbulent flow</span> <span class="journal_pages">pp 20</span>. (submitted)</div>
<div class="article_info">Tomas Skoglund and Petr Dejmek. <span class="article_issue_date"></span>. <span class="article_title">Fuzzy traceability - A process simulation derived extension of the traceability concept in continuous food processing</span> <span class="journal_pages">pp 8</span>. (submitted)</div>

Subject classification (UKÄ)

  • Food Engineering


  • Process lines
  • Dynamic model
  • Microbial deactivation
  • Data- och systemvetenskap
  • computer technology
  • Systems engineering
  • Fuzzy traceability
  • Traceability
  • Thermal engineering
  • termodynamik
  • Termisk teknik
  • applied thermodynamics
  • Chemical technology and engineering
  • Kemiteknik och kemisk teknologi
  • Food and drink technology
  • Heat exchanger
  • Dispersion
  • Fluid property transition
  • Liquid food
  • Dynamic simulation
  • Livsmedelsteknik


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