3.2. Selection of the Mass Transfer Coefficient

Try these first

1. 1.

   What does the mass transfer coefficient measure?

   Hint

   Think about the movement of substances in water.

2. 2.

   What is an example of a dense non-aqueous phase liquid?

   Hint

   Consider common industrial chemicals.

3. 3.

   What does the mass transfer coefficient indicate?

   • The rate of chemical reactions
   • The efficiency of substance transfer
   • The density of water

   Hint

   Think about what it measures in physical processes.

4. 4.

   True or False: The same mass transfer coefficients can be used for all chemicals without adjustment.

   • True
   • False

   Hint

   Reflect on the differences between substances.

5. 5.

   A chemical spill involves 100 kg of DNAPL entering a river with a depth of 5m. Calculate the mass transfer coefficient needed if the wind speed is 12m/s and discuss the implications.

   Hint

   Consider both the chemical properties and the environmental conditions.

6. 6.

   Evaluate the differences in mass transfer coefficients when switching from ethyl ether to benzene under similar environmental conditions. What adjustments would you make?

   Hint

   Look back at the scaling laws discussed earlier regarding how to adjust coefficients.