Question

Non-linear relationship between shear stress and shear rate exists in
A.newtonian fluids
B. non-newtonian fluids
C. both (a) and (b)
D. none of these

Answer 1

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Non-linear relationship between shear stress and shear rate exists in

➾ . both (a) and (b)



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Answer 2

The correct answer is OPTION B: Non-Newtonian Fluids.

• Shear rate and shear stress are strongly connected in non-Newtonian fluids.
• A fluid's viscosity can alter over time.
• As a result, determining a constant viscosity coefficient is difficult.
• Although viscosity is widely used to characterize a fluid's shear properties in fluid mechanics, it is inadequate for describing non-Newtonian fluids.
• They are best investigated utilizing rheological properties that link stress and strain rate tensors in various flow conditions, such as oscillatory shear or extensional flow, and are measured using various rheometers.
• Tensor-valued constitutive equations, which are ubiquitous in continuum mechanics, are better suited for exploring the properties.