2. Interphase Mass Transfer – Boundary Layer and Mass Transfer Coefficient

Try these first

1. 1.

   Define mass transfer coefficient.

   Hint

   Think about its relevance in engineering applications.

2. 2.

   What is diffusion?

   Hint

   Consider how perfume spreads in a room.

3. 3.

   What primarily drives mass transfer?

   • Temperature
   • Pressure
   • Concentration difference

   Hint

   Consider what initiates movement from one area to another.

4. 4.

   True or False: Diffusion is only significant in laminar flow.

   • True
   • False

   Hint

   Think about where diffusion happens commonly.

5. 5.

   Given a concentration gradient of 0.1 kg/m³ across a boundary layer thickness of 0.01 m and knowing the mass transfer coefficient is 2 m/s, calculate the mass transfer rate.

   Hint

   Focus on the mass transfer formula.

6. 6.

   Evaluate how the increase in turbulence due to higher flow rates might impact k and resultant mass transfer in a wastewater treatment scenario.

   Hint

   Consider how eddies affect mobility in fluids.