Practice Diffusion Across The Interface (2.3) - Interphase Mass Transfer – Individual and Overall Mass Transfer Coefficients

Practice: Diffusion Across the Interface

Lesson 2.3Interphase Mass Transfer – Individual and Overall Mass Transfer Coefficients

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8 questions

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2 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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2 questions · about 1 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is the role of the interface in mass transfer?
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Think about where two phases meet.
Question 2.
Define mass transfer coefficient.
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Consider what happens when different materials interact.
3Question 3.
What defines an interface in mass transfer?
- A solid boundary
- A meeting of two phases
- An imaginary line
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Think of a beaker with water and air.
4Question 4.
True or False: The concentration gradient remains the same at all depths in a beaker of water.
- True
- False
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Consider how density changes with depth.
Question 5.
Given a concentration of a substance in the water at 100 mg/L and a corresponding air equilibrium concentration of 2 mg/L, calculate the mass transfer coefficient if the flux is was found to be 10 mol/m^2/s.
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Make sure to use the steady state conditions properly.
Question 6.
A lake has turbulent conditions on the surface that enhances mass transfer. If you find that the concentration gradient between air and water is 1.5 mg/L/m, how would the increased turbulence affect the mass transfer calculations?
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Think about the physical impact of turbulence on fluid mixing.

4 more questions in this section. Enroll free to practise them all.