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Interparticle friction and Rheology of Dense suspensions

Abstract : Suspensions - a type of material consisted of solid particles dispersed in a liquid medium— are omnipresent in our daily life and in industry. Their key characteristic is the shear stress required to make them flow at a desire shear rate: this attribute is the area of interest of Rheology. Recently, it emerged that the friction between the particles impact the rheology of concentrated suspensions. This microscopic interaction can be altered by modifying the particle surface or, especially, by changing the liquid medium. In this thesis, we are looking to evidence and characterize the effect of interparticle friction on the rheological behaviors of suspension in the dense regime. We found that suspensions of same particles behave differently (Newtonian or shear-thinning) depending on the solvents utilized. Furthermore, their flow curve can be connected to the measurement of friction coefficient as a function of the normal force applied on the particles. Our work help paving the way for studies on effects of forces at microscopic scale on the bulk rheology.
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Submitted on : Monday, February 21, 2022 - 11:50:34 AM
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  • HAL Id : tel-03582540, version 1

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Anh Vu Nguyen Le. Interparticle friction and Rheology of Dense suspensions. Chemical Physics [physics.chem-ph]. Université Paris sciences et lettres, 2021. English. ⟨NNT : 2021UPSLS085⟩. ⟨tel-03582540⟩

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