4.4. Dynamic Viscosity Correlations

Try these first

1. 1.

   Define dynamic viscosity.

   Hint

   Think of how sticky something feels.

2. 2.

   What happens to the viscosity of a liquid when heated?

   Hint

   Consider how boiling water behaves.

3. 3.

   What does dynamic viscosity measure?

   • Pressure
   • Temperature
   • Resistance to flow

   Hint

   Think about what makes a fluid sticky.

4. 4.

   True or False: Shear stress is independent of shear strain rate in Newtonian fluids.

   • True
   • False

   Hint

   Reference Newton's law of viscosity.

5. 5.

   Assume you have a fluid with an initial viscosity of 0.01 Pa.s at 20°C. If it exhibits a decrease in viscosity proportional to a 0.5% change for every 10°C increase, calculate its viscosity at 60°C.

   Hint

   Consider temperature’s effect as given in the problem.

6. 6.

   Explain how you would conduct an experiment to measure the dynamic viscosity of a non-Newtonian fluid and what observations you would make.

   Hint

   Think about the steps required in a standard fluid mechanics experiment.