4. Correlation for Mass Transfer Coefficients

Try these first

1. 1.

   Define mass transfer coefficient.

   Hint

   Think about its role in environmental engineering.

2. 2.

   What does 'flux' refer to?

   Hint

   Consider the context of pollutant movement.

3. 3.

   What does mass transfer coefficient measure?

   • A. Temperature change
   • B. Rate of substance movement
   • C. Volume of liquid

   Hint

   Consider what it tells us about transfer efficiency.

4. 4.

   True or False: DNAPLs are lighter than water.

   • True
   • False

   Hint

   Recall characteristics of DNAPLs.

5. 5.

   You have a river contaminated with a DNAPL affecting the water quality downstream. If the concentration in the sediment is 20 mg/L and in the water is 5 mg/L, using a mass transfer coefficient of 0.1 cm/hr, estimate the flux into the water.

   Hint

   Make sure to plug in your values carefully and use the correct units.

6. 6.

   A study results in a correlation for evaporation from water stated as K = 0.025 * (vel^0.5). If the average wind speed is 10 m/s, calculate the mass transfer coefficient for evaporation.

   Hint

   Remember to evaluate the units based on the provided correlation.