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Université de Sherbrooke

1. Bordet, Aurélien. Experiments and numerical modelling of isothermal ice slurry flows .

Degree: 2018, Université de Sherbrooke

Abstract: The present PhD project gathers several works whose common goal is to give a better insight into the dynamics of ice slurry flows in a straight pipe under isothermal conditions. The research combines experiments and numerical modelling. The experimental part focuses on the analysis of the ice slurry flow patterns, made from an initial solution of 9.5%-mass propylene glycol, in function of three operating parameters: ice concentration, flow velocity, pressure drop. The specificity remains in the fact that the flow is visualised through a transparent portion of the pipe, giving a precise idea of its pattern at certain flow velocity and ice fraction level, and thus yielding the possibility to study the flow patterns and to correlate them to the aforementioned quantitative parameters. New complex flow patterns appear through the experiments and an original classification is established. Besides, pressure drop data are also collected for more complex geometries such as elbows and T-junctions. The numerical part aims at developing and assessing an advanced numerical model in order to investigate the dynamic behaviour of ice slurry flows under isothermal conditions. The transport equation proposed by [Phillips et al., 1992] for solid suspension flows is used as a basis to describe the evolution of the particle volume fraction within the flow. For turbulent flows and buoyant particles, two original terms are introduced to account for the turbulent dispersion and sedimentation of the particles. The model first favourably compares to experimental data available in the literature for three types of solid suspensions. It provides more accurate predictions than more complex two-phase models. Moreover, the transport equation for the particle volume fraction has been numerically analysed term by term in order to exhibit each individual physical/numerical phenomenon influencing the particle distribution within the mixture flow. The numerical model is then used confidently to investigate ice slurry flows. Four turbulence closures are compared in a numerical benchmark. For discussion, the results obtained by the SST k − ω model are also compared to the analytical model of [Kitanovski and Poredoš, 2002] for eight sets of inlet flow conditions (U m ,Φ m ). The present model is able to capture more complex flow features, especially the secondary flow, the near-wall boundary layers or some regimes specific to slurry flows. Advisors/Committee Members: Poncet, Sébastien (advisor), Galanis, Nicolas (advisor), Poirier, Michel (advisor).

Subjects/Keywords: Ice slurries; Solid suspension flows; Numerical modelling; Experimental fluid mechanics; Coulis de glace; Suspensions particulaires; Modélisation numérique; Mécanique des fluides expérimentale

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

APA (6th Edition):

Bordet, A. (2018). Experiments and numerical modelling of isothermal ice slurry flows . (Doctoral Dissertation). Université de Sherbrooke. Retrieved from http://hdl.handle.net/11143/12315

Chicago Manual of Style (16th Edition):

Bordet, Aurélien. “Experiments and numerical modelling of isothermal ice slurry flows .” 2018. Doctoral Dissertation, Université de Sherbrooke. Accessed July 17, 2019. http://hdl.handle.net/11143/12315.

MLA Handbook (7th Edition):

Bordet, Aurélien. “Experiments and numerical modelling of isothermal ice slurry flows .” 2018. Web. 17 Jul 2019.

Vancouver:

Bordet A. Experiments and numerical modelling of isothermal ice slurry flows . [Internet] [Doctoral dissertation]. Université de Sherbrooke; 2018. [cited 2019 Jul 17]. Available from: http://hdl.handle.net/11143/12315.

Council of Science Editors:

Bordet A. Experiments and numerical modelling of isothermal ice slurry flows . [Doctoral Dissertation]. Université de Sherbrooke; 2018. Available from: http://hdl.handle.net/11143/12315

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