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A dynamic object-oriented model for efficient simulation of microbial reduction in dispersed turbulent flow

Skoglund, Tomas LU and Dejmek, Petr LU (2008) In Journal of Food Engineering 86(3). p.358-369
Abstract
To account for microbial reduction and food quality changes, first-order chemical reaction was added to a model for axial-dispersed plug flow (ADPF), which was recently developed for efficient (In the terminology of this paper, efficient is related to computation time for a given level of accuracy.) computation of time-dependent, large flow systems. It was shown that the extended ADPF model gives accurate results for typical parameter values in liquid-food applications. The analysis was based on Laplace transforms and the models were written in the object-oriented language Modelica, as objects in a library structure which is being developed to simulate complex liquid-food process lines and their control systems. The models were also... (More)
To account for microbial reduction and food quality changes, first-order chemical reaction was added to a model for axial-dispersed plug flow (ADPF), which was recently developed for efficient (In the terminology of this paper, efficient is related to computation time for a given level of accuracy.) computation of time-dependent, large flow systems. It was shown that the extended ADPF model gives accurate results for typical parameter values in liquid-food applications. The analysis was based on Laplace transforms and the models were written in the object-oriented language Modelica, as objects in a library structure which is being developed to simulate complex liquid-food process lines and their control systems. The models were also implemented in such a way as to efficiently account for non-isothermal reactions in heat exchangers.



Furthermore, to account for changes in flow rates, a model of dynamically calculating the “true” holding time in a channel was developed. Simulations showed that the model performs better than a straightforward alternative. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Dynamic simulation, Liquid-food, Microorganisms, Heat exchanger, Dynamic model, Residence time distribution, Chemical reaction, Microbial reduction, Tube reactor, Dispersion
in
Journal of Food Engineering
volume
86
issue
3
pages
358 - 369
publisher
Elsevier
external identifiers
  • wos:000253064400007
  • scopus:37449022413
ISSN
0260-8774
DOI
10.1016/j.jfoodeng.2007.10.013
language
English
LU publication?
yes
id
c452e431-6ca9-44bc-9206-ebce0f7e46bf (old id 578195)
date added to LUP
2007-12-04 14:03:38
date last changed
2017-01-01 05:50:27
@article{c452e431-6ca9-44bc-9206-ebce0f7e46bf,
  abstract     = {To account for microbial reduction and food quality changes, first-order chemical reaction was added to a model for axial-dispersed plug flow (ADPF), which was recently developed for efficient (In the terminology of this paper, efficient is related to computation time for a given level of accuracy.) computation of time-dependent, large flow systems. It was shown that the extended ADPF model gives accurate results for typical parameter values in liquid-food applications. The analysis was based on Laplace transforms and the models were written in the object-oriented language Modelica, as objects in a library structure which is being developed to simulate complex liquid-food process lines and their control systems. The models were also implemented in such a way as to efficiently account for non-isothermal reactions in heat exchangers.<br/><br>
<br/><br>
Furthermore, to account for changes in flow rates, a model of dynamically calculating the “true” holding time in a channel was developed. Simulations showed that the model performs better than a straightforward alternative.},
  author       = {Skoglund, Tomas and Dejmek, Petr},
  issn         = {0260-8774},
  keyword      = {Dynamic simulation,Liquid-food,Microorganisms,Heat exchanger,Dynamic model,Residence time distribution,Chemical reaction,Microbial reduction,Tube reactor,Dispersion},
  language     = {eng},
  number       = {3},
  pages        = {358--369},
  publisher    = {Elsevier},
  series       = {Journal of Food Engineering},
  title        = {A dynamic object-oriented model for efficient simulation of microbial reduction in dispersed turbulent flow},
  url          = {http://dx.doi.org/10.1016/j.jfoodeng.2007.10.013},
  volume       = {86},
  year         = {2008},
}