Optimal design of the semi-dimple vortex generator in the fin and tube heat exchanger

Nares Chimres, Chi-Chuan Wang, Somchai Wongwises*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


The fin and tube heat exchanger with a semi-dimple pair is numerically studied in terms of the air side's thermal performance. The investigated parameters consist of the diameter, attack angle and the placed location of the semi-dimple. The results show that the 30° attack angle, 5.5 mm vertical distance and 7.5 mm horizontal distance can perform the highest j/f ratio or “goodness parameter” of every semi-dimple's diameter. Additionally, the thermal performance of the fin with a semi-dimple pair is also compared with that of the fin with existing semi-dimples and the plain fin within the Reynolds number ranging from 813 to 4019. Obviously, the existing semi-dimple exhibits the highest heat transfer coefficient and pressure drop. However, the semi-dimples’ pair demonstrates a goodness factor of 33–37% greater than the existing semi-dimples and 15–20% greater than the plain fin, approximately.

Original languageEnglish
Pages (from-to)1173-1186
Number of pages14
JournalInternational Journal of Heat and Mass Transfer
StatePublished - 1 May 2018


  • CFD
  • Fin and tube heat exchanger
  • Heat transfer enhancement
  • Semi dimple
  • Vortex generator

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