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

Summary, in English

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.

• Author: Tomas Skoglund; Petr Dejmek
• Department/s: Department of Food Technology, Engineering and Nutrition
• Publishing year: 2008
• Language: English
• Pages: 358-369
• Publication/Series: Journal of Food Engineering
• Volume: 86
• Issue: 3
• Full text: - 289 kB; Download statistics
• Links: http://dx.doi.org/10.1016/j.jfoodeng.2007.10.013
• Document type: Journal article
• Publisher: Elsevier
• Topic: Food Engineering
• Keywords: Dynamic simulation; Liquid-food; Microorganisms; Heat exchanger; Dynamic model; Residence time distribution; Chemical reaction; Microbial reduction; Tube reactor; Dispersion
• Status: Published
• ISBN/ISSN/Other: ISSN: 0260-8774