Skip to Main content Skip to Navigation
Theses

Modification des propriétés physico-chimiques de l'amidon par procédés hydrothermiques : Contribution à l'étude des transferts couplés chaleur-masse

Abstract : Starch, biopolymer of reserve, is the major component of cereals and of crop plants, has many industrial applications after hydrothermal processes. The objective of this work is to study the structural and function almodifications of standard maize starch by physical processes, as hydrothermal treatments (action of heat and moisture). The intensification of treatments, in a context of sustainable development, is nowadays a major challenge. This action belongs to the themes linked to the agri-resources valorisation and the development of the transformation processes devoted to the renewable carbonaceous resources. The impact of hydrothermaltreatments on starch physicochemical properties is extensively studied with the aim to connect the modificationof hydrotreated starches to their thermal (phase transitions, pasting) and rheological (flow and viscoelasticity)behaviours. The physical treatments applied to starches lead to important modifications of their structures,according to the processing conditions. The mastering of starch use requires the knowledge of implied phase transitions and resulting structures, which are mainly function of water content and temperature. In this aim, apart of this work was devoted to the comprehension of the physical phenomena responsible of the heat and mass transfer in the starch layer, during the treatment. A coupled heat and mass transfer model was developed, taking into account the biochemical reactions, which take place in the material simultaneously in presence of water and heat. Using the finite element method, the numerical simulation allowed to define the space distribution of the variable parameters (temperature, water content,…), which have a great influence on the progression of fusion reactions.
Document type :
Theses
Complete list of metadata

Cited literature [147 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00823904
Contributor : Abes Star :  Contact
Submitted on : Sunday, May 19, 2013 - 12:47:11 PM
Last modification on : Thursday, December 9, 2021 - 3:16:10 PM
Long-term archiving on: : Tuesday, August 20, 2013 - 4:07:29 AM

File

2012Bahrani29921.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-00823904, version 1

Collections

Citation

Seyed Amir Bahrani. Modification des propriétés physico-chimiques de l'amidon par procédés hydrothermiques : Contribution à l'étude des transferts couplés chaleur-masse. Autre. Université de La Rochelle, 2012. Français. ⟨NNT : 2012LAROS366⟩. ⟨tel-00823904⟩

Share

Metrics

Les métriques sont temporairement indisponibles