Squeeze flow of concentrated suspensions of spheres in Newtonian or shear-thinning fluids

• Autorzy: Collomb J. , Chaari F. , Chaouche M.
• Konferencja: Second International Conference on Engineering Rheology ICER 2003
• Języki publikacji: EN

Abstrakty

EN

The squeeze flow behaviour of concentrated suspensions of spheres in both Newtonian and shear thinning fluids is investigated experimentally. Analysing the evolution of the squeeze force as a function of time for different controlled velocities, the suspension is found to present two main flow regimes. The first regime is characterized by the situation in which the force decreases when the velocity decreases, which is expected and corresponds to a power-law fluid flow of the suspension. In the second regime the force increases when the velocity decreases which is an indication of solvent filtration through the particle skeleton that behaves then as a quasi-rigid porous media. It is found that the transition between the two regimes is a result of a competition between the viscous shear forces due the flow of the suspension and the damping force caused by the filtration of the fluid through the porous media made up by the particles. It is shown that the addition of a small amount (1000ppm) of a polymer (Xanthan) to the solvent significantly decreases the squeeze velocity for which we have fluid filtration.

Słowa kluczowe

EN

squeeze flow; concentrated suspension; flow-induced heterogeneity; filtration; polymer solution

PL

hydromechanika; przepływ; polimery; filtrowanie

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2003
• Tom: Vol. 8, no spec.
• Strony: 219--224
• Opis fizyczny: Bibliogr. 9 poz., wykr.

Twórcy

autor

Collomb J.

• Laboratoire de Mécanique et Technologie, Ecole Normale Supérieure de Cachan 61 Avenue du Président Wilson, 94235, Cachan Cedex, FRANCE

autor

Chaari F.

• Laboratoire de Mécanique et Technologie, Ecole Normale Supérieure de Cachan 61 Avenue du Président Wilson, 94235, Cachan Cedex, FRANCE

autor

Chaouche M.

• Laboratoire de Mécanique et Technologie, Ecole Normale Supérieure de Cachan 61 Avenue du Président Wilson, 94235, Cachan Cedex, FRANCE

Bibliografia

• [1] Chaari F., Racineux G., Poitou A. and Chaouche M.: Rheological behavior of sewage sludge and strain-induced dewatering. - Rheologica Acta (to appear).
• [2] Chaouche M., Chaari F., Racineux G., Poitou A. Comportement de fluides pateux en ecoulement d’ecrasement. - Rheologie (to appear) (in French).
• [3] Chhabra R.P., Comiti J. and Machac I. (2001): Flow of non-Newtonian fluids in fixed and fluidised beds: a review, -j Chem. Engng. Sci., vol.56, pp.1-27.
• [4] Cunha F.R. and Hinch E.J. (1996): Shear induced dispersion in a dilute suspension of rough spheres. - J. of Fluid Mech.,vol.309, No.211.
• [5] Delhaye N., Poitou A. and Chaouche M. (2000): Squeeze flow of highly concentrated suspensions of spheres. - Journal of N. Newtonian Fluid Mech., vol.94, No.l, pp.67-74.
• [6] Leighton D.T. and Acrivos A. (1987): Measurement of shear-induced self-diffusion in concentrated suspensions of spheres. - J. Fluid Mech., vol.l77, No. 19.
• [7] Racineux G. (1999): PhD Thesis, Ecole Normale Superieure de Cachan.
• [8] Scott J.R.: Trans. Inst. Rubber Ind., vol.l0, pp.481-493.
• [9] Sitzungber S.J. (1935): Akad. Wiss. Math. Natur. Wien, vol.69, No.2, pp.713-735.