Modeling and simulation of surface reactions and reactive flow of a nitriding process


Özdemir İ. B. , LIPPMANN N.

SURFACE & COATINGS TECHNOLOGY, vol.219, pp.151-162, 2013 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 219
  • Publication Date: 2013
  • Doi Number: 10.1016/j.surfcoat.2013.01.019
  • Title of Journal : SURFACE & COATINGS TECHNOLOGY
  • Page Numbers: pp.151-162

Abstract

Due to wide use of ammonia in gas nitriding processes, a numerical study has been undertaken to determine the ammonia decomposition rates over an injector body which was used as a steel catalyst under conditions likely to be employed in such applications. With the extrapolation of the data available for noble surfaces, intrinsic rate data have been obtained for the process temperatures of around 520 degrees C in furnace conditions with pressures varying between -100 and 900 Pa around the atmospheric pressure. The computational setup for surface reactions and furnace flow modeling was designed to match the in-service furnace used in Bosch production plants and contained 4.6 million mesh points and results were obtained with URANS k-epsilon turbulence model.