1. A sheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200°C and is permitted to achieve a steady-state diffusion condition. The diffusion coefficient for nitrogen in steel at this temperature is 6 10¹ m²/s, and the diffusion flux is found to be 1.2´ 107 kg/m²-s. Also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m³. How far into the sheet from this high-pressure side will the concentration be 2.0 kg/m³? Assume a linear concentration profile.
1. A sheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200°C and is permitted to achieve a steady-state diffusion condition. The diffusion coefficient for nitrogen in steel at this temperature is 6 10¹ m²/s, and the diffusion flux is found to be 1.2´ 107 kg/m²-s. Also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m³. How far into the sheet from this high-pressure side will the concentration be 2.0 kg/m³? Assume a linear concentration profile.
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:1. A sheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200 °C and is
permitted to achieve a steady-state diffusion condition. The diffusion coefficient for
nitrogen in steel at this temperature is 6 10¹ m²/s, and the diffusion flux is found to be
1.2´ 107 kg/m²-s. Also, it is known that the concentration of nitrogen in the steel at the
high-pressure surface is 4 kg/m³. How far into the sheet from this high-pressure side will
the concentration be 2.0 kg/m³? Assume a linear concentration profile.
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