Which of the following best describes Newtonian fluids? A) They exhibit complex flow behavior that varies over time. B) They have a direct and proportional relationship between she... Which of the following best describes Newtonian fluids? A) They exhibit complex flow behavior that varies over time. B) They have a direct and proportional relationship between shear stress and shear rate. C) Their viscosity changes abruptly with temperature fluctuations. D) Their viscosity is dependent on the rate of shear.
Understand the Problem
The question is asking to identify the correct statement that describes the characteristics of Newtonian fluids, specifically focusing on the relationship between shear stress and shear rate, as well as other properties related to viscosity.
Answer
They have a direct and proportional relationship between shear stress and shear rate.
The correct answer is: They have a direct and proportional relationship between shear stress and shear rate.
Answer for screen readers
The correct answer is: They have a direct and proportional relationship between shear stress and shear rate.
More Information
Newtonian fluids have a constant viscosity, which means that the shear stress and shear rate are linearly and directly proportional. This is a defining characteristic, distinguishing them from non-Newtonian fluids whose viscosity may change with shear rate or other conditions.
Tips
A common mistake is confusing Newtonian fluids with non-Newtonian fluids where the viscosity changes with shear rate or stress.
Sources
- Newtonian fluid - Wikipedia - en.wikipedia.org
- Newtonian Fluid - an overview | ScienceDirect Topics - sciencedirect.com
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