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Design of a test bench dedicated to the viscosity measurement of a complex chemical product under pressure.Various measurements campaigns on paint, pharmaceutical products, chemical products, oil and process expert assessment

PhD on Fluid Mechanics, Processes and Energy directed by Dr Albert Magnin et Pr Jean-Michel Piau.Entitled "Bubbles dynamics in yield stress fluids: Experimental study on micro-gels suspensions", my PhD thesis focuses on modelling industrial processes involving gases propagation through gelified media (such as biochemicla reactors, concrete, paper deinking...). The dynamics of bubbles in Carbopol gels was addressed experimentally. Carbopol gels are concentrated suspensions of micro-gels swollen with solvent.Firstly, the rheological behaviour of Carbopol gels has been carefully studied in order toprecise the role of the microstructure on slow dynamics of bubbles in Carbopol gels.In a second time, shapes, trajectories and dynamics of air bubble in these gels have beenobtained by both displacement and near and far velocity field measurements. These measurements have been tied up with the rheological behaviour and microstructure of thegels. The various experiments performed then confirm and define the significant role ofinternal stresses existing within a Carbopol gel on the trajectory and shape of bubbles in ayield stress fluid. This thesis gives a precise view of the rheological behaviour of the Carbopol gels, especiallyconcerning time scales of the structure changes. The quasi-static injection condition allows usto highlight tension surface effects and plastic properties of the gels.Publication:http://dx.doi.org/10.1016/j.jnnfm.2012.01.003