Thermodynamic analysis of convective heat transfer in an annular packed bed

Y. Demirel, R. Kahraman

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

A combination of the first and second law of thermodynamics has been utilized in analyzing the convective heat transfer in an annular packed bed. The bed was heated asymmetrically by constant heat fluxes. Introduction of the packing enhances wall to fluid heat transfer considerably, hence reduces the entropy generation due to heat transfer across a finite temperature difference. However, the entropy generation due to fluid-flow friction increases. The net entropy generations resulting from the above effects provide a new criterion in analysing the system. Using the modified Ergun equation for pressure drop estimation and a heat transfer coefficient correlation for an annular packed bed, an expression for the volumetric entropy generation rate has been derived and displayed graphically. In the packed annulus, the fully developed temperature profile and the plug flow conditions have been assumed and verified with experimental data. The volumetric entropy generation map shows the regions with excessive entropy generation due to operating conditions or design parameters for a required task, and leads to a better understanding of the behavior of the system. (C) 2000 Elsevier Science Inc. All rights reserved.

Original languageEnglish (US)
Pages (from-to)442-448
Number of pages7
JournalInternational Journal of Heat and Fluid Flow
Volume21
Issue number4
DOIs
StatePublished - Aug 2000

Keywords

  • Annular packed bed
  • Asymmetric heating
  • Bejan number
  • Entropy generation
  • Irreversibility distribution ratio
  • Thermodynamic analysis

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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