4.6.1. Definition and Effects

Try these first

1. 1.

   What happens to fluid velocity at a stationary surface?

   Hint

   Think about the interactions between fluid layers and the surface.

2. 2.

   Define viscosity in your own words.

   Hint

   Consider how sticky or runny a liquid is.

3. 3.

   What is shear stress a measure of?

   • The weight of a fluid
   • The tendency of fluid layers to slide
   • The velocity of a moving fluid

   Hint

   Focus on the interaction between fluid layers and surfaces.

4. 4.

   True or False: All fluids are Newtonian.

   • True
   • False

   Hint

   Think of examples like ketchup and honey.

5. 5.

   Determine how the force required to move a plate through a fluid changes as the fluid's temperature is increased from 20°C to 80°C, if the initial viscosity is known.

   Hint

   Review how temperature influences viscosity and apply it to the calculations.

6. 6.

   In a laboratory, a non-Newtonian fluid shows an increasing viscosity with increased shear rate. Describe how this behavior could impact industrial applications.

   Hint

   Think about how a dilatant fluid behaves under stress.