Chapter 7.20, Problem 3DP

(a)

To determine

To compute:

The wall thickness to give this diffusion flux.

(b)

To determine

The circumferential stress on the wall.

(c)

To determine

To explain:

The reason why or why not the expectation of wall thickness computed in part (B) suitable for Ni cylinder at 350 C?

(d)

To determine

To compute:

The minimum thickness of tube walls.

The amount of diffusion flux increase with the reduction in thickness of tube walls.

The minimum thickness of tube walls form part (C), if the calculation is found to be unsuitable. From this case, calculate the amount of decrease in diffusion flux.