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You searched for +publisher:"University of Florida" +contributor:("GUAZZELLI,ELISABETH"). Showing records 1 – 3 of 3 total matches.

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University of Florida

1. Snook, Braden J. The Dynamics of the Microstructure and the Rheology in Suspensions of Rigid Particles.

Degree: PhD, Chemical Engineering, 2015, University of Florida

Numerical and experimental methods have been used to reveal the complex relationship between the macroscopic properties and the microstructure, or relative arrangement of particles, of a suspension. Both spheres and fibers Advisors/Committee Members: BUTLER,JASON E (committee chair), CURTIS,JENNIFER S (committee member), MEI,RENWEI (committee member), GUAZZELLI,ELISABETH (committee member), ZOUESHTIAGH,FARZAM (committee member), POULIQUEN,OLIVIER (committee member), LEMAIRE,ELISABETH (committee member).

Subjects/Keywords: Aspect ratio; Experimental results; Hydrodynamics; Material concentration; Rheology; Shear flow; Shear stress; Simulations; Velocity; Vorticity; fibers  – multiphase-flow  – spheres  – suspensions

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Snook, B. J. (2015). The Dynamics of the Microstructure and the Rheology in Suspensions of Rigid Particles. (Doctoral Dissertation). University of Florida. Retrieved from https://ufdc.ufl.edu/UFE0047628

Chicago Manual of Style (16th Edition):

Snook, Braden J. “The Dynamics of the Microstructure and the Rheology in Suspensions of Rigid Particles.” 2015. Doctoral Dissertation, University of Florida. Accessed May 30, 2020. https://ufdc.ufl.edu/UFE0047628.

MLA Handbook (7th Edition):

Snook, Braden J. “The Dynamics of the Microstructure and the Rheology in Suspensions of Rigid Particles.” 2015. Web. 30 May 2020.

Vancouver:

Snook BJ. The Dynamics of the Microstructure and the Rheology in Suspensions of Rigid Particles. [Internet] [Doctoral dissertation]. University of Florida; 2015. [cited 2020 May 30]. Available from: https://ufdc.ufl.edu/UFE0047628.

Council of Science Editors:

Snook BJ. The Dynamics of the Microstructure and the Rheology in Suspensions of Rigid Particles. [Doctoral Dissertation]. University of Florida; 2015. Available from: https://ufdc.ufl.edu/UFE0047628

2. Snook, Braden. The dynamics of the microstructure and the rheology in suspensions of rigid particles : Implementation of passive samplers for monitoring pesticides in Lebanese aquatic environments.

Degree: Docteur es, Mécanique et Physique des Fluides, 2015, Aix-Marseille; University of Florida

Des méthodes numériques et expérimentales ont été utilisées pour identifier la relation entre les propriétés macroscopiques et la microstructure d'une suspension contenant soit des sphères soit des fibres rigides. Pour les fibres, les résultats en utilisant un modèle numérique original indiquent que les contacts sont dominants dans la prédiction de la dynamique de la microstructure. Les résultats montrent en outre que les contacts doivent être inclus dans le calcul des contraintes afin de prédire avec précision les différences de contraintes normales. Des expériences ont été effectués pour mesurer les différences de contraintes normales et ont sont en accord avec les prédictions numériques. Cela valide le modèle développé et ses résultats. Les écarts avec les travaux antérieurs dans la littérature ont été examinées. Le temps nécessaire pour atteindre l'état d'équilibre et l'influence de confinement de la géométrie expérimentale peuvent être la source de ces différences. Pour les sphères, une expérience a été construite pour étudier la dynamique de la migration de particules dans un écoulement de Poiseuille. Nous avons mesuré la fraction volumique de particules avec une grande résolution ainsi que les distribution de vitesse. Les résultats dans le régime stationnaire de migration finale ont été jugés en excellent accord avec les précédentes simulations discrètes et les expériences dans des géométries et concentrations. La dynamique a été comparée à le modèle de bilan de suspension ('Suspension Balance Model'). L'accord avec ce modèle n'est bon qu'à grande fraction volumique. Des développements supplémentaires concernant la rhéologie utilisés dans le SBM sont nécessaires.

Numerical and experimental methods were used to reveal the complex relationship between the macroscopic properties and the microstructure of a suspension where either spheres or rigid fibers were considered. For fibers, results using a newly developed numerical model indicate that contacts are dominant in predicting the dynamics of the microstructure. The results show contacts must be included in calculating the stress in order to accurately predict the normal stress differences as well. Experiments measuring the normal stress differences were performed and were found to be in agreement with the numerical predictions, validating the model and its results. Discrepancies with previous work in the literature were examined. The long time required to reach steady state and the influence of confinement from the experimental geometry were found to be the source of these differences. For spheres, an experiment was built to study the dynamics of particle migration in parabolic flow. High-resolution particle volume fraction and velocity distribution measurements were made. Steady state results were found to be in excellent agreement with previous discrete element simulations and experiments at similar geometries and volume fractions. Dynamic results were compared to the suspension balance model (SBM). Excellent agreement with the SBM was exhibited only at…

Advisors/Committee Members: Guazzelli, Elisabeth (thesis director), Butler, Jason E. (thesis director).

Subjects/Keywords: Fibres; Sphères; Suspensions; Rhéologie; Modèle; Migration induite par le cisaillement; Fibers; Spheres; Suspensions; Rheology; Modeling; Shear-Induced migration

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Snook, B. (2015). The dynamics of the microstructure and the rheology in suspensions of rigid particles : Implementation of passive samplers for monitoring pesticides in Lebanese aquatic environments. (Doctoral Dissertation). Aix-Marseille; University of Florida. Retrieved from http://www.theses.fr/2015AIXM4700

Chicago Manual of Style (16th Edition):

Snook, Braden. “The dynamics of the microstructure and the rheology in suspensions of rigid particles : Implementation of passive samplers for monitoring pesticides in Lebanese aquatic environments.” 2015. Doctoral Dissertation, Aix-Marseille; University of Florida. Accessed May 30, 2020. http://www.theses.fr/2015AIXM4700.

MLA Handbook (7th Edition):

Snook, Braden. “The dynamics of the microstructure and the rheology in suspensions of rigid particles : Implementation of passive samplers for monitoring pesticides in Lebanese aquatic environments.” 2015. Web. 30 May 2020.

Vancouver:

Snook B. The dynamics of the microstructure and the rheology in suspensions of rigid particles : Implementation of passive samplers for monitoring pesticides in Lebanese aquatic environments. [Internet] [Doctoral dissertation]. Aix-Marseille; University of Florida; 2015. [cited 2020 May 30]. Available from: http://www.theses.fr/2015AIXM4700.

Council of Science Editors:

Snook B. The dynamics of the microstructure and the rheology in suspensions of rigid particles : Implementation of passive samplers for monitoring pesticides in Lebanese aquatic environments. [Doctoral Dissertation]. Aix-Marseille; University of Florida; 2015. Available from: http://www.theses.fr/2015AIXM4700

3. Shaikh, Saif. Dynamics and rheology of concentrated suspensions of rigid fibers : Dynamique et rhéologie des fibres en suspension.

Degree: Docteur es, Mécanique et physique des fluides, 2017, Aix-Marseille; University of Florida

Une étude combinant expériences et analyses est menée afin de rationaliser la dynamique et la rhéologie des suspensions très concentrées de fibres rigides, non colloïdales dans un fluide newtonien. Des mesures rhéologiques couplées à des mesures de la microstructure sont réalisées à l’aide de plusieurs dispositifs expérimentaux permettant d’analyser différents types de géométries et d’écoulements. Des expériences de rhéologie standards (rhéologie à volume contrôlé), ainsi qu’une méthode de rhéologie non-conventionnelle (rhéologie à pression contrôlée) sont associées afin de mesurer la contrainte de cisaillement, la pression de la phase particulaire et la fraction volumique des suspensions très concentrées. Un autre dispositif expérimental a été conçu dans le but d’étudier la microstructure (distribution spatiale et distribution d’orientations) d’une suspension de fibres rigides dans un écoulement de Poiseuille oscillant. Alors que ce type d’écoulement est réversible pour un liquide newtonien, dans le cas d’une suspension concentrée, les interactions entre particules introduisent des changements irréversibles de microstructure. Cette microstructure est affectée et a un effet sur l’écoulement imposé, cette dépendance non-linéaire incluant les interactions hydrodynamiques. L’objectif de ces expériences est d’apporter un éclairage sur des effets tels que la rhéofluidification observée à fort taux de cisaillement et sur le démixage dû à la migration induite par cisaillement.

A combined work of experiments and data analyses is proposed to investigate the dynamics and rheology of highly concentrated suspensions of non-colloidal rigid rods in a Newtonian fluid. Detailed measurements of the rheology and the microstructure are made using a variety of experimental devices with different geometries and imposed flows. Standard rheology experiments (volume-controlled rheology), as well as a novel method of rheometry, are carried out to measure torques, particle pressures, and volume fractions at high concentration (pressure-controlled rheology). Another experiment has been designed and constructed to study the microstructure (spatial and orientation distribution) of a suspension of rigid rods in an oscillatory parabolic flow. Though the flow is reversible in these systems, the changes in the microstructure are irreversibile in the case of concentrated suspensions due to particle interactions. The microstructure is affected by, and has an effect, on the imposed flows; this non-linear dependency includes hydrodynamic interactions. The purpose of these experiments is to gain insight into phenomena such as apparent shear-thinning at high shear rates and demixing due to shear-induced migration.

Advisors/Committee Members: Guazzelli, Elisabeth (thesis director), Butler, Jason E. (thesis director).

Subjects/Keywords: Rheologie; Suspensions; Fibres; Rheology; Suspensions; Fibers

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Shaikh, S. (2017). Dynamics and rheology of concentrated suspensions of rigid fibers : Dynamique et rhéologie des fibres en suspension. (Doctoral Dissertation). Aix-Marseille; University of Florida. Retrieved from http://www.theses.fr/2017AIXM0495

Chicago Manual of Style (16th Edition):

Shaikh, Saif. “Dynamics and rheology of concentrated suspensions of rigid fibers : Dynamique et rhéologie des fibres en suspension.” 2017. Doctoral Dissertation, Aix-Marseille; University of Florida. Accessed May 30, 2020. http://www.theses.fr/2017AIXM0495.

MLA Handbook (7th Edition):

Shaikh, Saif. “Dynamics and rheology of concentrated suspensions of rigid fibers : Dynamique et rhéologie des fibres en suspension.” 2017. Web. 30 May 2020.

Vancouver:

Shaikh S. Dynamics and rheology of concentrated suspensions of rigid fibers : Dynamique et rhéologie des fibres en suspension. [Internet] [Doctoral dissertation]. Aix-Marseille; University of Florida; 2017. [cited 2020 May 30]. Available from: http://www.theses.fr/2017AIXM0495.

Council of Science Editors:

Shaikh S. Dynamics and rheology of concentrated suspensions of rigid fibers : Dynamique et rhéologie des fibres en suspension. [Doctoral Dissertation]. Aix-Marseille; University of Florida; 2017. Available from: http://www.theses.fr/2017AIXM0495

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