Читать книгу The Rheology Handbook - Thomas Mezger - Страница 50

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