P
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Last name: PETERS
First name: Francois
Email: Francois.PETERS@univ-cotedazur.fr
Institution: UCA
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This paper presents an experimental facility that allows simultaneous viscosimetric and Particle Image velocimetry measurements on concentrated suspensions in a wide-gap Couette rheometer. The experimental procedure is detailed: the optical characteristics of the index-matched suspension are carefully studied, the bottom end effect on both the...
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This paper presents three-dimensional numerical simulations of non-colloidal dense sus-pensions in a wall-bounded shear flow at zero Reynolds number. Simulations rely on a fictitious domain method with a detailed modelling of particle-particle and wall-particle lubrication forces, as well as contact forces including particle roughness and...
Cette étude numérique cherche à mieux comprendre le rôle du contact dans les suspensions concentrées, en particulier l'effet du frottement et des rugosités. Les simulations montrent que le frottement modifie la rhéologie des suspensions (viscosité et contraintes normales) du fait d'une augmentation de la contribution tangentielle mais aussi,...
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- This paper deals with the Quincke rotation of small insulating particles. This DC electro-rotation of insulating objects immersed in a slightly conducting liquid is usually explained by looking at the action of the free charges present in the liquid. Under the effect of the DC electric field, the charges accumulate at the surface of the...
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Dense suspensions display complex flow properties, intermediate between solid and liquid. When sheared, a suspension self-organizes and forms particle clusters that are likely to percolate, possibly leading to significant changes in the overall behavior. Some theoretical conjectures on percolation in suspensions were proposed by De Gennes some...
In this paper we present measurements of the electrophoretic mobility of colloidal particles by using heterodyne detection of light scattering. The measurements have been done up to concentrations of 5.4 % of silica nanoparticles, with a diameter of the order of 80 nm, in a mixture of 70 % toluene and 30 % ethanol. In order to make possible the...
The rheological behaviour of a suspension of insulating particles dispersed in a slightly conducting liquid under the action of a DC electric field is studied. The polarisation of the particles induced by the field is shown to be responsible for a rotation of the particles (Quincke rotation) which, in turn, leads to a drastic decrease of the...
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