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“theoretical ideal” flow models with a yield stress. However in reality, the value of yield stress will depend on the testing method. Therefore, a measured yield stress should be referred to as an “apparent yield stress”. One of the most extensively used method to determine the yield stress is probably the
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.
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.
Introduction to yield stress fluids. understand definition/caveats of apparent yield stress fluids develop a feel for yield stress and viscosity values. Rheometry with yield stress fluids. identify and avoid slip artifacts correct for parallel plate artifacts recognize LAOS response of yield stress fluids.
Introduction. Many complex fluids, such as network forming poly-mers, surfactant mesophases, emulsions, etc., do not flow until the applied stress exceeds a certain critical value, known as the yield stress. Materials exhibiting this behavior are said to be exhibiting yield flow behavior.
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.
Measuring the Flow Properties of Yield Stress Fluids | Annual Reviews. Home. A-Z Publications. Annual Review of Fluid Mechanics. Volume 24, 1992. Article.
