(a) Example 11–1. Consider the mass transfer-limited reactionWhat would your concentration...

(a) Example 11–1. Consider the mass transfer-limited reaction

What would your concentration (mole fraction) profile look like? Using the same values for DAB, and so on, in Example 11–1, what is the flux of A.

(b) Example 11–2. How would your answers change if the temperature was increased by 50°C, the particle diameter was doubled, and fluid velocity was cut in half? Assume properties of water can be used for this system.

(c) Example 11–3. How would your answers change if you had a50–50 mixture of hydrazine and helium? If you increase dp by a factor of5?

(d) Example 11–4. What if you were asked for representative values for Re, Se, Sh, and kc for both liquid- and gas-phase systems for a velocity of 10 cm/s and a pipe diameter of 5 cm (or a packed-bed diameter of 0.2 cm)? What numbers would you give?

(e) Example 11–5. How would your answers change if the reaction were carried out in the liquid phase where kinematic viscosity varied as

(f) Side Note. Derive equations (1) to (3) on page 772. Next consider there are no gradients inside the patch and that the equilibrium solubility in the skin immediately adjacent to the skin is CA0 = HCAP where H is a form of Henry's law constant. Write the flux as a fonction of H, δ1, DAB1, DAB2, δ2. and CAP. Finally carry out a quasi-steady analysis, i.e.,

to predict the drug delivery as a function of time. Compare this result with that where the drug in the patch is in a dissolving solid and a hydrogel and therefore constant with time. Explore this problem using different models and parameter values.

Additional information

H = 0.1, DAB1 = 10-6 cm2/s, DAB2 = 10-5 cm2/s, Ap = 5 cm2, V = 1 cm3 and CAP = 10 mg/dm3