Mémoire de Maîtrise
DOI
https://doi.org/10.11606/D.3.2013.tde-27122013-113320
Document
Auteur
Nom complet
Rafael Viana Benze
Unité de l'USP
Domain de Connaissance
Date de Soutenance
Editeur
São Paulo, 2013
Directeur
Jury
Gut, Jorge Andrey Wilhelms (Président)
Pessôa Filho, Pedro de Alcântara
Schmidt, Flávio Luís
Titre en portugais
Modelagem matemática do processo térmico contínuo de alimentos líquidos em trocadores de calor a placas.
Mots-clés en portugais
Modelagem matemática
Pasteurização
Processamento térmico
Simulação
Resumé en portugais
Titre en anglais
Mathematical modeling of the continuous thermal processing of liquid foods in plate heat exchangers.
Mots-clés en anglais
Mathematical modeling
Pasteurization
Plate heat exchanger
Simulation
Thermal processing
Resumé en anglais
The main objective of this study was to develop a mathematical model in a plate pasteurizer in order to determine the temperature and lethality distribution along the channels of the heat exchanger in all its sections, in tubular connections and holding tube evaluating the logarithmic decay in concentration of a target microorganism or enzyme activity in a continuous pasteurization process. Mathematical modeling was composed of the differential energy balance and lethality in the channels of the exchanger, the holding tube and its connections, taking into account the heat loss to the environment in the tubes. The constructed model presented a set of ordinary differential equations of first order and its resolution was made by the finite difference method using the gPROMS software. A case study was analyzed and the modeling described the thermal and the lethality process very well and in the future it can be used to optimize the process of pasteurization in plate heat exchangers, aiming the achievement of safe and with high quality products. A verification of the pasteurization process that the model developed contemplates has been performed based on experimental validation using time-temperature integrator and testing with enzymatic indicator (alkaline phosphatase in phosphate buffer), which showed that the model developed satisfactorily approximates the actual results.

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Date de Publication
2014-01-10

AVERTISSEMENT: Le matériau se réfère à des documents provenant de cette thèse ou mémoire. Le contenu de ces documents est la responsabilité de l'auteur de la thèse ou mémoire.
• BENZE, R.V., e GUT, J.A.W. Distribuição de letalidade no tratamento térmico contínuo de sucos de frutas em pasteurizador a placas. In XIX Congresso Brasileiro de Engenharia Química, Búzios, 2012. Anais do Congresso Brasileiro de Engenharia Química.São Carlos : Cubo Multimidia, 2012.
• BENZE, R.V., and GUT, J.A.W. Modeling and validation of the continuous HTST thermal processing of liquid foods with plate heat exchangers. In AIChE Annual Meeting, San Francisco, 2013. AIChE 2013 Annual Meeting Conference Proceedings., 2013. Available from: http://www3.aiche.org/proceedings/Session.aspx?SessionID=24585.
• BENZE, R.V., and GUT, J.A.W. Modeling the sterility value distribution in the continuous thermal processing of liquid foods with plate heat exchangers. In 16th IUFoST World Congress of Science and Technology, Foz do Iguaçu, 2012. 16th IUFoST Abstracts. : TecArt, 2012. Abstract.
• BENZE, R.V., e GUT, J.A.W. Uso de indicador enzimático para validação de modelo matemático de letalidade distribuída de um pasteurizador a placas. In IV Simpósio em Ciência e Tecnologia de Alimentos, João Pessoa, 2012. Anais do IV SICTA., 2012. Resumo.
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