A sheet of BCC iron 3.7-mm thick was exposed to a carburizing atmosphere on one side and a decarburizing atmosphere on the other side at 725°C. After having reached steady state, the iron was quickly cooled to room temperature. The carbon concentrations at the two surfaces were determined to be 0.012 and 0.0065 wt%. Calculate the diffusion coefficient if the diffusion flux is 3.8 x 10-8 kg/m2-s, given that the densities of carbon and iron are 2.25 and 7.87 g/cm3, respectively. Hint: Use Equation 4.9a-that is, for this problem C = | × 10³ Cc Cre PC ' PFe to convert concentrations from weight percent carbon to kilograms of carbon per cubic meter or iron. m?/s
A sheet of BCC iron 3.7-mm thick was exposed to a carburizing atmosphere on one side and a decarburizing atmosphere on the other side at 725°C. After having reached steady state, the iron was quickly cooled to room temperature. The carbon concentrations at the two surfaces were determined to be 0.012 and 0.0065 wt%. Calculate the diffusion coefficient if the diffusion flux is 3.8 x 10-8 kg/m2-s, given that the densities of carbon and iron are 2.25 and 7.87 g/cm3, respectively. Hint: Use Equation 4.9a-that is, for this problem C = | × 10³ Cc Cre PC ' PFe to convert concentrations from weight percent carbon to kilograms of carbon per cubic meter or iron. m?/s
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:A sheet of BCC iron 3.7-mm thick was exposed to a carburizing atmosphere on one side and a decarburizing atmosphere on the
other side at 725°C. After having reached steady state, the iron was quickly cooled to room temperature. The carbon concentrations
at the two surfaces were determined to be 0.012 and 0.0065 wt%. Calculate the diffusion coefficient if the diffusion flux is 3.8 x 10-8
kg/m2-s, given that the densities of carbon and iron are 2.25 and 7.87 g/cm3, respectively.
Hint: Use Equation 4.9a-that is, for this problem
C =
| × 10³
Cc Cre
PC ' PFe
to convert concentrations from weight percent carbon to kilograms of carbon per cubic meter or iron.
m?/s
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