4.1.3. Angular Deformations

Try these first

1. 1.

   What is shear stress?

   Hint

   Think about how forces act on surfaces.

2. 2.

   Define viscosity in simple terms.

   Hint

   Consider how jelly behaves in comparison to water.

3. 3.

   What describes angular deformation in fluid mechanics?

   • Straightening of a fluid
   • Change in angle due to shear stress
   • Increase in pressure

   Hint

   Consider how a fluid changes shape under stress applied.

4. 4.

   True or False: Viscosity decreases with increasing temperature in liquids.

   • True
   • False

   Hint

   Think about how heat affects the flow of a liquid.

5. 5.

   A fluid between parallel plates experiences a velocity gradient of 5 m/s over a distance of 0.1 m. Calculate the shear stress if the viscosity of the fluid is 0.8 Pa.s.

   Hint

   Make sure to use the right units for viscosity and gradient!

6. 6.

   Explain the difference in viscosity behavior when temperature is increased for water (liquid) and air (gas).

   Hint

   Think about how heat influences both types of fluids distinctly.