2.4. Flux Definitions

Try these first

1. 1.

   What does the mass transfer coefficient represent?

   Hint

   Think about what factors affect how easily substances can move.

2. 2.

   Define flux in the context of mass transfer.

   Hint

   Consider how you measure the movement of substances.

3. 3.

   What does the mass transfer coefficient indicate?

   • Efficiency of mass transfer
   • Volume of substance transferred
   • Mass of substance

   Hint

   Relate it to how easily substances move.

4. 4.

   True or False: Flux measures the speed of mass transfer.

   • True
   • False

   Hint

   Think about what units flux would have.

5. 5.

   Given the bulk concentration of a pollutant in a lake is 5 mg/L and the equilibrium concentration in air is 0.1 mg/L, calculate the mass transfer flux if the mass transfer coefficients for air and water are 0.01 and 0.1 m/s respectively.

   Hint

   Make sure to differentiate between bulk and equilibrium concentrations.

6. 6.

   Design an experiment to measure the mass transfer coefficient for a gas dissolving in a liquid. Detail the necessary materials and the procedure.

   Hint

   Remember to account for temperature and pressure changes during the experiment.