Non-Newtonian fluids are substances that do not follow Newton's law of viscosity, meaning their flow behavior changes under stress or over time. Unlike Newtonian fluids, which have a constant viscosity regardless of the applied shear rate, non-Newtonian fluids can exhibit behaviors such as shear thinning or thickening, making their study particularly relevant in various fields including geothermal systems where fluid dynamics plays a critical role.
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