4.2. Effects of Fluid Velocity on Mass Transfer

Try these first

1. 1.

   What does Fick's Law describe?

   Hint

   Think about how substances move from higher to lower concentrations.

2. 2.

   List two factors affecting diffusion coefficients.

   Hint

   Consider how these characteristics influence movement.

3. 3.

   What does Fick's Law state about the relationship between concentration and mass flux?

   • Mass flux increases with an increase in concentration
   • Mass flux decreases with an increase in concentration
   • Mass flux is independent of concentration

   Hint

   Consider how substances move in response to concentration differences.

4. 4.

   True or False: Higher viscosity results in increased diffusion rates.

   • True
   • False

   Hint

   Think about how thick liquids behave compared to lighter fluids.

5. 5.

   Calculate the mass flux of a pollutant that has a concentration difference of 12 mg/L across a distance of 0.5 m, if the diffusion coefficient in the medium is 0.015 m²/s.

   Hint

   Remember to pay attention to the units, ensuring consistency across the calculations.

6. 6.

   Describe how you would design an experiment to assess the impact of increased fluid velocity on the rate of mass transfer in a controlled environment, and what variables you would measure.

   Hint

   Think about what tools you would need to accurately monitor and measure the affecting variables.