3.5. Natural Convection

Try these first

1. 1.

   What is natural convection?

   Hint

   Think about how warm air behaves.

2. 2.

   Define the Sherwood number.

   Hint

   It’s a measure of mass transfer effectiveness.

3. 3.

   What causes natural convection?

   • Chemical reactions
   • Density differences
   • Pressure differences

   Hint

   Consider how warm fluids act.

4. 4.

   True or False: The Sherwood number increases with better mass transfer efficiency.

   • True
   • False

   Hint

   Is it a direct correlation?

5. 5.

   Evaluate the mass transfer scenario for a chemical spill in a lake considering Reynolds and Sherwood numbers.

   Hint

   Connect flow behavior to mass transport principles.

6. 6.

   Discuss how natural convection might vary in a stratified lake versus an unstratified river.

   Hint

   Consider the density differences in both scenarios.