scholarly journals Rheological Characterization of Yield-Stress Fluids with Brookfield Viscometer

2021 ◽  
Vol 31 (1) ◽  
pp. 1-9
Author(s):  
Andrei Potanin ◽  
Greggory Marron
Keyword(s):  
Yield Stress ◽  
Accurate Data ◽  
Viscosity Method ◽  
Rheological Characterization ◽  
Simple Method ◽  
Yield Stress Fluids ◽  
Apparent Shear Rate ◽  
Selection Of ◽  
Good Agreement

Abstract This paper analyzes various techniques to use viscometers equipped with vane spindles to characterize rheological properties of yield stress fluids. Specifically, application of Brookfield viscometers to this end is discussed. A wide selection of toothpastes and lotions were tested. It is shown that a simple method based on apparent shear rate and stress, commonly referred to as a representative viscosity method, works well for moderately non-Newtonian samples but may significantly underestimate viscosity for samples with a more pronounced yield stress behavior. To get more accurate data an integral equation relating torque to angular velocity needs to be solved which can be easily done numerically to get a good agreement between the data collected on an inexpensive viscometer and the data from high-end rheometers.

Physicochemical and Electro-Rheological Characterization of Kaolinite / CMS / Silicone Oil Fluid

2010 ◽  
Vol 446 ◽  
pp. 33-41
Author(s):  
Thomas Reiss ◽  
Saoussen Laribi ◽  
Jean-Marie Fleureau ◽  
Jean Francois Tassin
Keyword(s):  
Electric Field ◽  
Yield Stress ◽  
Applied Electric Field ◽  
Silicone Oil ◽  
Rheological Behaviour ◽  
Rheological Characterization ◽  
Clay Particles ◽  
Observed Behaviour ◽  
Composite Nature

The aim of this study is to elaborate electro-rheological fluids based on kaolinite. the scientific characterization made it possible the identification of the composite nature and the checking of the intercalation of the polymer among the clay particles The rheological behaviour of the fluid depends on the electric field. A yield stress of the suspensions is observed, which increases with the applied electric field. An interpretation based on the different modes of association between the clay particles is proposed to account qualitatively for the observed behaviour.

Selection of EPS-producing Lactobacillus strains isolated from kefir grains and rheological characterization of the fermented milks

LWT ◽  
2015 ◽  
Vol 63 (1) ◽  
pp. 129-135 ◽  
Author(s):  
Maria F. Hamet ◽  
Judith A. Piermaria ◽  
Analía G. Abraham
Keyword(s):  
Rheological Characterization ◽  
Kefir Grains ◽  
Selection Of

Review : Instrumentation for the rheological characterization of foods/Instrumentación para la caracterización reológica de alimentos

1995 ◽  
Vol 1 (1) ◽  
pp. 3-17 ◽  
Author(s):  
L. Ma ◽  
G.V. Barbosa-Canovas
Keyword(s):  
Angular Displacement ◽  
Viscous Heating ◽  
End Effect ◽  
Concentric Cylinder ◽  
Rheological Characterization ◽  
Food Material ◽  
Torque Transducer ◽  
Main Components ◽  
Selection Of

The rheometer, which measures the associated torque at controlled deformation, or, alternately, the associated deformation at controllable known torque, is an essential tool in food rheological studies. The modern rheometer consists of three main components: a measuring geometry, a torque transducer, and an angular displacement device. The geometry is very important; it is used to generate a particular deformation of a food material. In rheological measurements, the geometry is usually interchangeable and can be selected according to the physical state of the testing material. Thus, the selection of a measuring geometry (i.e., cone-plate, parallel plate, concentric cylinder, or capillary geometry) is critical if reliable and accurate rheological data are required. In this review, the basic concepts of rheological properties (viscosity and viscoelasticity) are summarized; working equations of several commonly used geometries are presented; nonideality of geometries (i.e., end effect, slippage, viscous heating, etc.) are discussed; working equations of standard geometries are given; and, finally, the design philosophy of newly developed features of several commercial rheometers are addressed.

Rheological characterization of yield stress gels formed via electrostatic heteroaggregation of metal oxide nanoparticles

Soft Matter ◽  
2017 ◽  
Vol 13 (38) ◽  
pp. 6743-6755 ◽  
Author(s):  
Javen S. Weston ◽  
Jeffrey H. Harwell ◽  
Brian P. Grady
Keyword(s):  
Metal Oxide ◽  
Rheological Properties ◽  
Yield Stress ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Rheological Characterization ◽  
Oppositely Charged

Yield stress gels are formed when oppositely charged fumed nanoparticle species are dispersed in water. The gels are stable against sedimentation, have tunable rheological properties, and exhibit very little thixotropy.

scholarly journals Experimental Investigation on Rheological Properties of Water Based Novel Ternary Hybrid Nanofluids

2021 ◽  
Author(s):  
Mohammed Zayan ◽  
Abdul Khaliq Rasheed ◽  
Akbar John ◽  
Mohammed Khalid ◽  
Ahmad Faris
Keyword(s):  
Hybrid Nanoparticles ◽  
Damping Factor ◽  
Rheological Characterization ◽  
Viscosity Models ◽  
Water Based ◽  
Plastic Fluid ◽  
Linear Viscoelastic ◽  
The Stability ◽  
Good Agreement

This study presents the rheological characterization of deionised water dispersed with two different ternary-hybrid nanoparticles namely, GO-TiO2-Ag and rGO-TiO2-Ag. The stability of 0.05 wt% nanofluid samples are serially diluted by 10 fold in 5 levels is determined using zeta potential measurements. The non-linear viscoelastic measurements at temperatures ranging from 25oC to 50oC reveal that the graphene based ternary hybrid nanoparticle nanofluids exhibit Newtonian behaviour at higher concentrations. However, it displays shear thinning or pseudo-plastic fluid characteristics at lower concentration, suggesting a potential influence of nanoparticle aggregation on the viscosity. The experimental results are found to be in good agreement with the existing water based viscosity models. In addition, the effect due to shear stress, angular sweep, frequency sweep and damping factor ratio is also plotted.

scholarly journals Experimental Investigation on Rheological Properties of Water Based Novel Ternary Hybrid Nanofluids

2021 ◽  
Author(s):  
Mohammed Zayan ◽  
Abdul Khaliq Rasheed ◽  
Akbar John ◽  
Mohammed Khalid ◽  
Ahmad Faris
Keyword(s):  
Hybrid Nanoparticles ◽  
Damping Factor ◽  
Rheological Characterization ◽  
Viscosity Models ◽  
Water Based ◽  
Plastic Fluid ◽  
Linear Viscoelastic ◽  
The Stability ◽  
Good Agreement

This study presents the rheological characterization of deionised water dispersed with two different ternary-hybrid nanoparticles namely, GO-TiO2-Ag and rGO-TiO2-Ag. The stability of 0.05 wt% nanofluid samples are serially diluted by 10 fold in 5 levels is determined using zeta potential measurements. The non-linear viscoelastic measurements at temperatures ranging from 25oC to 50oC reveal that the graphene based ternary hybrid nanoparticle nanofluids exhibit Newtonian behaviour at higher concentrations. However, it displays shear thinning or pseudo-plastic fluid characteristics at lower concentration, suggesting a potential influence of nanoparticle aggregation on the viscosity. The experimental results are found to be in good agreement with the existing water based viscosity models. In addition, the effect due to shear stress, angular sweep, frequency sweep and damping factor ratio is also plotted.

Characterization of yield stress fluids with concentric cylinder viscometers

1987 ◽  
Vol 26 (6) ◽  
pp. 508-515 ◽  
Author(s):  
Q. D. Nguyen ◽  
D. V. Boger
Keyword(s):  
Yield Stress ◽  
Concentric Cylinder ◽  
Yield Stress Fluids
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