Meaning
Flow characteristics define a fluid state where viscosity changes according to the applied shear stress or strain rate rather than remaining constant. Systems demonstrating non-newtonian rheology exhibit internal resistance that deviates from linear proportionality between shear stress and shear rate. This deviation governs how polymers, slurries, and gels behave during mechanical processing.
High concentrations of dispersed particles typically force this specific liquid response in industrial settings.
Operational Dynamics
Materials possessing these traits alter their internal structure when subjected to force. Shear-thinning substances become more fluid under pressure, whereas shear-thickening liquids show an increase in resistance as movement velocity rises. Engineers calculate these parameters to determine pumping requirements for thick coatings or adhesives.
Precise control over this phenomenon prevents line blockages and ensures uniform distribution during coating cycles.
Measurement Standards
Laboratory analysis relies on rotational viscometers to capture data across a range of shear rates. Technicians plot the resulting flow curves to determine the consistency index and the flow behavior exponent. These values establish whether a substance acts as a pseudoplastic, dilatant, or bingham plastic material.
Standardized testing protocols verify that chemicals meet rheological specifications before entering high-speed production lines.
Market Implications
Procurement departments utilize these viscosity profiles to set quality benchmarks for incoming raw materials. Deviations from established flow curves result in uneven product quality and equipment damage. Suppliers provide technical datasheets detailing how shear history affects specific product performance under load.
Accurate modeling of these fluid dynamics reduces energy expenditure and material waste.
