If its viscosity changes with the shear rate, a liquid is non-Newtonian and – for exact definition – one has to specify the apparent viscosity.ĭifferent shear-dependent fluids behave differently: For some, their viscosity decreases when the shear rate increases (curve 2 | e.g. Typical Newtonian liquids are water or salad oil. For a Newtonian liquid, this function is a straight line (curve 1) see figure 6. Such fluids are named ‘Newtonian liquids’ after Sir Isaac Newton.Ī viscosity function shows the viscosity over the shear rate. the shear rate – acting upon the fluid, it is ideally viscous. If a fluid’s internal flow resistance is independent of the external force – i.e. High-viscosity fluids resist deformation. Fluids which flow easily show a low resistance to deformation. viscous fluids that contain an elastic portion. The specific field of viscometry covers ideally viscous fluids, and – considering certain restrictions – also viscoelastic liquids, i.e. sweet jelly) or as a viscoelastic liquid (like e.g. According to a material’s properties, we either classify it as a viscoelastic solid (like e.g. That is, substances which are neither completely elastic, nor entirely viscous. In everyday life, we mostly come across viscoelastic materials. Scientists specify solid materials as being elastic and liquids as being viscous. Imagine all materials as classified on a virtual scale from solid to liquid.
Rheology deals with the flow behavior and deformation of materials. In the last part of the study, two mathematical relationships are presented-developed on the basis of data from the conducted experiments-serving for calculation of liquid steel dynamic viscosity.In order to determine a fluid’s viscosity, you have to enter the field of viscometry, a subject area of a wider science called rheology. Issues of the viscosity and rheological properties of liquid ferrous solutions are important from the perspective of modeling, and also control of actual production processes related to the manufacturing and casting of metals, including iron and steel.
The article deals with issues related to the setting of values of the dynamic viscosity of liquid steel based on the conducted high-temperature rheological measurements. Empiric formulas for dynamic viscosity of liquid steel based on rheometric measurements Empiric formulas for dynamic viscosity of liquid steel based on rheometric measurements
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