Effects of thermal dispersion on heat transfer in cross-flow tubular heat exchangers

Y. Sano, F. Kuwahara, M. Mobedi, A. Nakayama

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Effects of thermal dispersion on heat transfer and temperature field within cross-flow tubular heat exchangers are investigated both analytically and numerically, exploiting the volume averaging theory in porous media. Thermal dispersion caused by fluid mixing due to the presence of the obstacles plays an important role in enhancing heat transfer. Therefore, it must be taken into account for accurate estimations of the exit temperature and total heat transfer rate. It is shown that the thermal dispersion coefficient is inversely proportional to the interstitial heat transfer coefficient. The present analysis reveals that conventional estimations without consideration of the thermal dispersion result in errors in the fluid temperature development and underestimation of the total heat transfer rate.

Original languageEnglish
Pages (from-to)183-189
Number of pages7
JournalHeat and Mass Transfer/Waerme- und Stoffuebertragung
Volume48
Issue number1
DOIs
Publication statusPublished - Jan 2012

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Fluid Flow and Transfer Processes

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