1.7. Fluid Viscosity

Try these first

1. 1.

   Define viscosity.

   Hint

   Think about fluids that flow easily versus those that don't.

2. 2.

   What happens to the viscosity of liquids when heated?

   Hint

   Consider how syrup flows when warm.

3. 3.

   What is viscosity?

   • A measure of volume
   • A measure of a fluid's resistance to flow
   • A measure of temperature

   Hint

   Think about how easily liquids flow.

4. 4.

   True or False: Higher temperatures increase the viscosity of liquids.

   • True
   • False

   Hint

   Consider what happens when heating syrup.

5. 5.

   A hockey puck is gliding over a surface of ice. If the ice is 0.1 m thick and has a viscosity of 0.001 Pa.s, what’s the force due to viscosity?

   Hint

   You might need to consider the velocity gradient to proceed.

6. 6.

   A fluid layer of thickness 0.5 mm flows between two plates. If the dynamic viscosity is 5 Pa.s and the velocity of the top plate is 0.1 m/s, find the shear force acting on the surface.

   Hint

   Identify your surface area and work through the calculations.