2. A heat exchanger made of a sheet of FCC iron (thickness = 1 mm) is used to store the nitrogen gas at 1200 °C. The concentration of N at one surface is 0.04 at% and the concentration at the opposite surface is 0.005 at%. Evaluate the flux of nitrogen through the foil in N atoms/(m².s). Given that the gas constant, R = 8.314 Jmol ¹K-1 and use the diffusion data in the Table 1 for your calculation. Diffusion Couple Q (kJ/mol) Do (m²/s) ×10-4 Interstitial diffusion: C in FCC iron 137.7 C in BCC iron 87.5 N in FCC iron 144.7 N in BCC iron 76.6 0.23 0.011 0.0034 0.0047 Table 1: Diffusion data for selected materials
2. A heat exchanger made of a sheet of FCC iron (thickness = 1 mm) is used to store the nitrogen gas at 1200 °C. The concentration of N at one surface is 0.04 at% and the concentration at the opposite surface is 0.005 at%. Evaluate the flux of nitrogen through the foil in N atoms/(m².s). Given that the gas constant, R = 8.314 Jmol ¹K-1 and use the diffusion data in the Table 1 for your calculation. Diffusion Couple Q (kJ/mol) Do (m²/s) ×10-4 Interstitial diffusion: C in FCC iron 137.7 C in BCC iron 87.5 N in FCC iron 144.7 N in BCC iron 76.6 0.23 0.011 0.0034 0.0047 Table 1: Diffusion data for selected materials
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:2. A heat exchanger made of a sheet of FCC iron (thickness = 1 mm) is used to store the nitrogen
gas at 1200 °C. The concentration of N at one surface is 0.04 at% and the concentration at the
opposite surface is 0.005 at%. Evaluate the flux of nitrogen through the foil in N atoms/(m².s).
Given that the gas constant, R = 8.314 Jmol ¹K-1 and use the diffusion data in the Table 1 for
your calculation.
Diffusion Couple
Q (kJ/mol)
Do (m²/s) ×10-4
Interstitial diffusion:
C in FCC iron
137.7
C in BCC iron
87.5
N in FCC iron
144.7
N in BCC iron
76.6
0.23
0.011
0.0034
0.0047
Table 1: Diffusion data for selected materials
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