Effect of inclination angle on free convection thermal performance of louver finned heat exchanger

Atipoang Nuntaphan*, Sanparwat Vithayasai, Tanongkiat Kiatsiriroat, Chi-Chuan Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


The effect of inclination angle on the louver finned tube heat exchanger subject to natural convection condition is reported in this study. It is found that the inclination angle plays an importance role on the performance of the louver finned heat exchanger. Performance of the heat exchanger is associated with the interactions between fin, louver, tube, and inclination angle. The heat transfer performance generally decreases with the rise of the inclination angle. This decrease of heat transfer performance is due to the blockage fin and its reversed heat dissipating direction against the raising air. However, at an inclination angle such as 30-45°, a considerable increase of heat transfer performance is seen. This is because appreciable amount of air flow was directed by the louver, causing a "louver-directed" phenomenon as that of in forced convection. With a further increase of inclination angle, the blockage effect caused by the fin is so strong as to offset the "louver-directed" phenomenon. Unlike those shown in force convection, the heat transfer performance decreased with the number of tube row.

Original languageEnglish
Pages (from-to)361-366
Number of pages6
JournalInternational Journal of Heat and Mass Transfer
Issue number1-2
StatePublished - 1 Jan 2007


  • Free convection
  • Inclination
  • Louver fin and tube heat exchanger

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