Unstable flows of concentrated suspensions

2008 ◽  
pp. 210-247 ◽  
Author(s):  
D. Quemada
Keyword(s):  
Concentrated Suspensions

scholarly journals Quantification of shear viscosity and wall slip velocity of highly concentrated suspensions with non-Newtonian matrices in pressure driven flows

2021 ◽  
Author(s):  
Patrick Wilms ◽  
Jan Wieringa ◽  
Theo Blijdenstein ◽  
Kees van Malssen ◽  
Reinhard Kohlus
Keyword(s):  
Shear Stress ◽  
Liquid Phase ◽  
Shear Rate ◽  
Shear Viscosity ◽  
Slip Velocity ◽  
Volume Fraction ◽  
Solid Volume Fraction ◽  
Wall Slip ◽  
Flow Index ◽  
Concentrated Suspensions

AbstractThe rheological characterization of concentrated suspensions is complicated by the heterogeneous nature of their flow. In this contribution, the shear viscosity and wall slip velocity are quantified for highly concentrated suspensions (solid volume fractions of 0.55–0.60, D4,3 ~ 5 µm). The shear viscosity was determined using a high-pressure capillary rheometer equipped with a 3D-printed die that has a grooved surface of the internal flow channel. The wall slip velocity was then calculated from the difference between the apparent shear rates through a rough and smooth die, at identical wall shear stress. The influence of liquid phase rheology on the wall slip velocity was investigated by using different thickeners, resulting in different degrees of shear rate dependency, i.e. the flow indices varied between 0.20 and 1.00. The wall slip velocity scaled with the flow index of the liquid phase at a solid volume fraction of 0.60 and showed increasingly large deviations with decreasing solid volume fraction. It is hypothesized that these deviations are related to shear-induced migration of solids and macromolecules due to the large shear stress and shear rate gradients.

Simulation of concentrated suspensions in free surface systems

2016 ◽  
Vol 94 (11) ◽  
pp. 2145-2152 ◽  
Author(s):  
Mahyar Javidi ◽  
Andrew N. Hrymak
Keyword(s):  
Free Surface ◽  
Concentrated Suspensions

Flow behavior of concentrated suspensions

1995 ◽  
Vol 39 (4) ◽  
pp. 795-795
Author(s):  
Yasufumi Otsubo
Keyword(s):  
Flow Behavior ◽  
Concentrated Suspensions

Effect of flow geometry on the evolution of concentrated suspensions flowing through a fracture

2018 ◽  
Vol 108 ◽  
pp. 80-92
Author(s):  
Ricardo Medina ◽  
Russell L. Detwiler ◽  
Romain Prioul ◽  
Wenyue Xu ◽  
Jean E. Elkhoury
Keyword(s):  
Concentrated Suspensions ◽  
Flow Geometry

Electroacoustic Study of n-Hexadecane/Water Emulsions

2001 ◽  
Vol 54 (8) ◽  
pp. 503 ◽  
Author(s):  
Linggen Kong ◽  
James K. Beattie ◽  
Robert J. Hunter
Keyword(s):  
Particle Size ◽  
Zeta Potential ◽  
Volume Fraction ◽  
Sodium Dodecyl ◽  
Surfactant Solution ◽  
Minimum Size ◽  
Water Mixture ◽  
Concentrated Suspensions ◽  
Minimum Concentration ◽  
Median Diameter

n-Hexadecane-in-water emulsions were investigated by electroacoustics using a prototype of an AcoustoSizer-II apparatus. The emulsions were formed by passing the stirred oil/water mixture through a homogenizer in the presence of sodium dodecyl sulfate (SDS) at natural pH (6–7). With increasing oil-volume fraction, the particle size increased linearly after 5 and also after 20 passages through the homogenizer, suggesting that surface energy was determining particle size. For systems in which the surfactant concentration was limited, the particle size after 20 passages approached the value dictated by the SDS concentration. With ample surfactant present, the median diameter was a linear function of the inverse of the total energy input as measured by the number of passes. There was, however, a limit to the amount of size reduction that could be achieved in the homogenizer, and the minimum size was smaller at smaller volume fractions. Dilution of the emulsion with a surfactant solution of the same composition as the water phase had a negligible effect on the particle size and changed the zeta potential only slightly. This confirms results from previous work and validates the equations used to determine the particle size and zeta potential in concentrated suspensions. The minimum concentration of SDS that could prevent the emulsion from coalescing for the system with 6% by volume oil was 3 mM. For this dilute emulsion, the particle size decreased regularly with an increase in SDS concentration, but the magnitude of the zeta potential went through a strong maximum at intermediate surfactant concentrations.

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

2004 ◽  
Vol 48 (2) ◽  
pp. 405-416 ◽  
Author(s):  
J. Collomb ◽  
F. Chaari ◽  
M. Chaouche
Keyword(s):  
Shear Thinning ◽  
Squeeze Flow ◽  
Concentrated Suspensions ◽  
Shear Thinning Fluids

scholarly journals Synthesis of Al2O3-ZrO2 powders from differently concentrated suspensions with a spray drying technique

2016 ◽  
Author(s):  
Galina Lyamina ◽  
Alfa Ilela ◽  
Oleg Khasanov ◽  
Mariya Petyukevich ◽  
Elena Vaitulevich
Keyword(s):  
Spray Drying ◽  
Concentrated Suspensions
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