Reconsider Prob. 14–82. Using the EES (or other) software, evaluate the oxygen concentration with varying time and distance from the wall surface. By varying the distance from the wall surface for 0 ≤ x ≤ 2 cm, for t = 10,000 s, 50,000 s, and 150,000 s, plot the oxygen concentration ratio, C_A(x,t)/C_A,s, as a function of the distance from the surface, x.

Data from problem 82

A thick wall made of natural rubber is exposed to pure oxygen gas on one side of its surface. Both the wall and oxygen gas are isothermal at 25°C, and the oxygen concentration at the wall surface is constant. Determine the time required for the oxygen concentration at x = 5 mm to reach 5% of its concentration at the wall surface.

Transcribed Image Text:

Oxygen gas 0 I 5 mm 1-- Rubber wall X