2.4. Boundary Layer Concept

Try these first

1. 1.

   What is a boundary layer in mass transfer?

   Hint

   Think about surfaces and fluid flow.

2. 2.

   Define mass transfer coefficient.

   Hint

   It's related to concentration gradients.

3. 3.

   What is the primary role of a boundary layer in mass transfer?

   • To enhance convection
   • To create resistance
   • To facilitate diffusion

   Hint

   Consider how layers impact flow.

4. 4.

   True or False: Diffusion can only occur in still fluids.

   • True
   • False

   Hint

   Think about when molecules move.

5. 5.

   In a specific scenario, you need to model the mass transfer of a pollutant in a river. Given the flow velocity and concentration gradients at various points, predict how changes in the boundary layer thickness would affect the pollutant dispersion.

   Hint

   Think about how several factors, including flow speed and obstacles, could alter the layer.

6. 6.

   Design a heat exchanger based on the mass transfer principles discussed. Consider how to minimize resistance in boundary layers during operation.

   Hint

   Look for ways that promote turbulence.