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A phenomenological model of starchy materials expansion by extrusion

hal.structure.identifierUnité de recherche sur les Biopolymères, Interactions Assemblages [BIA]
dc.contributor.authorKRISTIAWAN, Magdalena
hal.structure.identifierUnité de recherche sur les Biopolymères, Interactions Assemblages [BIA]
dc.contributor.authorDELLA VALLE, Guy
hal.structure.identifierUnité de recherche sur les Biopolymères, Interactions Assemblages [BIA]
dc.contributor.authorKANSOU, Kamal
hal.structure.identifierUnité de recherche sur les Biopolymères, Interactions Assemblages [BIA]
dc.contributor.authorCHAUNIER, Laurent
hal.structure.identifierInstitut de Mécanique et d'Ingénierie de Bordeaux [I2M]
dc.contributor.authorNDIAYE, Amadou
hal.structure.identifierCentre de Mise en Forme des Matériaux [CEMEF]
dc.contributor.authorVERGNES, Bruno
hal.structure.identifierSciences Computers Consultants [SC-Consultants]
dc.contributor.authorDAVID, Chantal
dc.date.accessioned2021-05-14T09:34:51Z
dc.date.available2021-05-14T09:34:51Z
dc.date.issued2015
dc.date.conference2015-10-18
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/76157
dc.description.abstractEnDuring extrusion of starchy products, the molten material is forced through a die so that the sudden pressure drop causes part of the water to vaporize, giving an expanded cellular structure. The moisture is lost due to evaporation and heat transfer, as the material cools down. Thus, the material crosses glass transition Tg and becomes solid. No simple deterministic model is available to describe satisfactory dynamic, multiphysic and multiphase phenomena during expansion. Current models are too complex to be coupled with simple mechanistic model of co-rotating twin-screw extrusion process, in order to predict the cellular structure of starchy foams. Our objective is to elaborate a phenomenological model of expansion, simple enough to be coupled with Ludovic®, a simulation software of twin screw extrusion process. From experimental results that cover a wide range of thermomechanical conditions, a concept map of influence relationships between input and output variables is built. It takes into account the phenomena of bubbles nucleation, growth, coalescence, shrinkage and setting, in a viscoelastic medium. The input variables are the moisture content MC, melt temperature Tp, specific mechanical energy SME, shear viscosity at the die exit, computed by Ludovic®, and the melt storage modulus E’(Tp>Tg). The latter represents the elongational viscosity, and takes into account the influence of starch amylose content. The outputs of the model are the macrostructure (expansion indices and anisotropy factor), and cellular structure (fineness) of solid foams, determined by X-ray tomography. Then a general model is suggested: VEI=α(η/η0)^n in which VEI is the volumetric expansion index. The model parameters, α and n depend on Tp, MC, SME and E’. The link between macroscopic anisotropy and fineness is also established, allowing the prediction of cellular structure. Finally, the model is validated using experimental data of wheat flour extrusion from literature.
dc.language.isoen
dc.subjectExtrusion
dc.subjectExpansion
dc.subject.enStarch
dc.title.enA phenomenological model of starchy materials expansion by extrusion
dc.typeAutre communication scientifique (congrès sans actes - poster - séminaire...)
dc.subject.halSciences du Vivant [q-bio]/Ingénierie des aliments
dc.subject.halSciences de l'ingénieur [physics]/Génie des procédés
bordeaux.hal.laboratoriesInstitut de Mécanique et d’Ingénierie de Bordeaux (I2M) - UMR 5295*
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionBordeaux INP
bordeaux.institutionCNRS
bordeaux.institutionINRAE
bordeaux.institutionArts et Métiers
bordeaux.countryUS
bordeaux.title.proceedingAACC International Annual Meeting 2015
bordeaux.conference.cityMinneapolis
bordeaux.peerReviewedoui
hal.identifierhal-02739993
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02739993v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.date=2015&rft.au=KRISTIAWAN,%20Magdalena&DELLA%20VALLE,%20Guy&KANSOU,%20Kamal&CHAUNIER,%20Laurent&NDIAYE,%20Amadou&rft.genre=conference


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