2.3. Mass Transfer Resistance

Try these first

1. 1.

   What is mass transfer coefficient?

   Hint

   Think about how substances travel from one phase to another.

2. 2.

   What does flux represent?

   Hint

   Recall the definition of flux in terms of area.

3. 3.

   What is the relationship between mass transfer coefficients and flux?

   • They are directly proportional
   • They have no relationship
   • They are inversely proportional

   Hint

   Think about their definitions.

4. 4.

   Is it true that the overall mass transfer rate is influenced by the phase with the highest resistance?

   • True
   • False

   Hint

   Reflect on the previous conversations we had about resistances.

5. 5.

   If k1 = 0.1 and k2 = 0.9, and the interface concentrations are 5 M for liquid and 0.5 M for gas, calculate the flux.

   Hint

   Ensure you use the correct coefficients for each phase.

6. 6.

   A polluted river has a concentration of 12 ppm and the air above has 2 ppm. If you find that the gas resistance is negligible, calculate the overall resistance impacting the transfer rate.

   Hint

   Assess the given data against the relationships discussed.