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3.3Flow curves and viscosity functions

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Flow curves are usually measured at a constant measuring temperature, i. e. at isothermal conditions. In principle, flow behavior is combined always with flow resistance, and therefore with an internal friction process occurring between the molecules and particles. In order to perform accurate tests in spite of the resulting viscous heating of the sample, the use of a temperature control device is required, for example in the form of a water bath or a Peltier element (see also Chapter 11.7.6: Temperature control systems).


Figure 3.1: Preset profile: Time-dependent shear rate ramp in the form of a step-like function


Figure 3.2: Preset profile: Time-dependent shear rate ramp


Figure 3.3: Flow curves, overview:

(1) ideal-viscous, (2) shear-thinning,

(3) shear-thickening behavior


Figure 3.4: Viscosity functions, overview:

(1) ideal-viscous, (2) shear-thinning,

(3) shear-thickening behavior

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