4.2.1. Shear Strain Rate Relation

Try these first

1. 1.

   What is shear stress?

   Hint

   Think of how forces apply in layers.

2. 2.

   Define viscosity.

   Hint

   Consider how thick a fluid is.

3. 3.

   What is shear strain rate defined as?

   • The change in volume over time
   • The rate of change in shear
   • The resistance to flow

   Hint

   Think about how strain occurs due to applied forces.

4. 4.

   True or False: Shear stress is independent of temperature changes in fluids.

   • True
   • False

   Hint

   Reflect on how heating affects fluid flow.

5. 5.

   A fluid has a viscosity of 0.8 Pa·s and a velocity gradient of 500 s^-1. Calculate the shear stress acting on the fluid.

   Hint

   Use the formula: shear stress = viscosity * velocity gradient.

6. 6.

   Discuss how increasing temperature affects viscosity in both liquids and gases, providing examples.

   Hint

   Consider the molecular motion in both cases.