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1 Δεκ 2016 · Yield stress values from different methods for (a) Carbopol, (b) emulsions, and (c) hair gel and foam. Black symbols are the values obtained from steady shear experiments, in which flow curves were fit to the Herschel–Bulkley model. Blue symbols are values obtained from the oscillatory measurements.
- On Different Ways of Measuring “The” Yield Stress
Yield stress materials are ubiquitous, yet the best way to...
- Laos
Both linear PP and branched PP display LAOS type I behavior...
- Measuring The Yield Behaviour of Structured Fluids
A comparison for the apparent yield stress determined from...
- Rheology of Concentrated Dispersions
The -naximum or overshoot value of the transient shear...
- Yield Stress Fluid Flows
Note that, with yield stress fluids, slip at the wall may...
- Rotating Vane Rheometry
With the vane method, the usual simple formula employed for...
- Is The Yield Stress of Aqueous Foam a Well-Defined Quantity
The characteristic depth Δh at which the shear stress...
- Carbopol Gels
The main limiting yield stress value s may have to be...
- On Different Ways of Measuring “The” Yield Stress
ABSTRACT. Yield stress analysis is important for all complex structured fluids. It is helpful to better understand product performance in applications such as product shelf life and stability. In theory, the yield stress is the minimum shear stress required to initiate flow.
The controlled stress approach provides three alternative experimental methods for determining apparent yield stress: (1) Stress can be ramped slowly from zero to some higher value. The stress level at which motion first occurs is the apparent yield stress.
6 Ιουλ 2012 · Residual stress (plateau) determined from relaxation tests for different materials: emulsion (squares), materials C1 (circles), C2 (diamonds), and C3 (triangles), scaled by the yield stress of each material determined from rheometry, as a function of the velocity before stoppage. Full size image.
This presentation explains and discusses the various approaches available to measure yield stress, and aspects of the practical measurement set-up and test parameters that need to be considered to obtain relevant, robust and reliable yield stress data using a rotational rheometer.
10 Νοε 2021 · This paper covers phenomenological yield stress models as well as experimental techniques to measure yield stress. It also discusses, in particular, problems associated with very low yield stress measurements that occur with bio-fluids such as blood.
1 Ιαν 2013 · The slump test, initially developed to determine the flow properties of fresh concrete, has been adopted as a means of accurately measuring the yield stress of strongly flocculated suspensions.
