Second law analysis of compressible flow through a diffuser subjected to constant wall temperature

Arshad M. H., Kahraman R., Sahin A. Z., Mansour R. B.

INTERNATIONAL JOURNAL OF EXERGY, vol.7, no.1, pp.110-129, 2010 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 7 Issue: 1
  • Publication Date: 2010
  • Doi Number: 10.1504/ijex.2010.029618
  • Journal Name: INTERNATIONAL JOURNAL OF EXERGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.110-129
  • Keywords: entropy generation, compressible flow, diffuser, CFD, constant wall temperature, CONVECTIVE HEAT-TRANSFER, LAMINAR FORCED-CONVECTION, ENTROPY GENERATION, DUCT, PERFORMANCE
  • Istanbul Technical University Affiliated: No

Abstract

This study presents the investigation of entropy generation in compressible turbulent flow of air through a diffuser. Constant temperature boundary condition is applied at the wall. Two-dimensional solution of velocity and temperature fields are obtained using the CFD code FLUENT. Regions of high entropy generation in the diffuser have been predicted. The desired inlet expansion angle corresponding to the minimum entropy generation at specified flow conditions is determined. The numerical analysis suggests that by successfully predicting the distribution of irreversibility in a thermal system, re-design efforts can be more carefully focused on specific regions with highest entropy generation.