A thin sheet of iron 0.5 mm thick has a nitrogen concentration on one side of 0.

Question

A thin sheet of iron 0.5 mm thick has a nitrogen concentration on one side of 0.5 kg/m3 and a nitrogen concentration on the other side of 2.6 kg/m3 . The diffusion coefficient is 3.44×1015 m2/s.

What is the flux of nitrogen through the iron?

Skill Problem 7.1 A thin sheet of iron 0.5 mm thick has a nitrogen concentration on one side of 0.5 kg/ and a m nitrogen concentration on the other side of 2.6 kg/m3 The diffusion coefficient is 3.44 x 10 15 m2/s You may want to review (On page Part A What is the flux of nitrogen through the iron? Express your answer to three significant figures VeC Submit My Answers Give Up Provide Feedback Continue

Explanation / Answer

Using,

D = -J[(x)/Ca - Cb)]

with,

J = diffusion flux

D = diffusion coefficient

x = thickness of sheet in m

Ca and Cb are concentrations

So,

J = -3.44 x 10^-15/[-5 x 10^-4/(2.6 - 0.5)]

   = 1.445 x 10^-11 m^2/s

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