1. Tutorial/HW Week #8 WRF Chapter 23; WWWR Chapters 25-26 ID Chapter 14
To be discussed on March 14, 2017.
By either volunteer or class list.

2. Special Forms
Combining the flux equation with the continuity equation,

3. Assuming constant r and DAB, we get
Additionally, if there are no reactions, then or

4. And if there is also no fluid motion, v = 0,
Which is Fick’s second law of diffusion
For steady state process, constant r and DAB,

5. With no chemical reaction and no fluid flow, becomes
which is the Laplace equation for molar concentration.

6. Initial and Boundary Conditions
Initial condition: e.g. t = 0, CA=CA0.
Boundary condition:
(a) The concentration of the transferring species A at a boundary is specified.
(b) A reacting surface boundary is specified.

7. Example 1

14. Example 2

17. Example 3

24. R2 R2 R1

25. Review #2: Convective Heat Transfer & Mass Transfer Fundamentals
Please Refer to Appendix 8.