Natural convection in an oscillating cylindrical enclosure with pin fins

Hao Ju Hsu, Yi Hsuan Huang, Yao-Hsien Liu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


This study experimentally investigated natural convection in an oscillating cylindrical enclosure to simulate heat transfer inside a buoy of a wave power generator. Mechanical oscillations were applied vertically to simulate the operating conditions of a wave power generator extracting energy from the surface motion of ocean waves. The Rayleigh numbers used in this study ranged from 50,000 to 600,000. Enclosures of various heights H (2.5, 3, 4, and 5 cm) and oscillations of various frequencies (1 and 2 Hz) were investigated. In addition, pin fins of length L were attached to the heat transfer area, and the heat transfer coefficient variation was examined at various L/H ratios (0.4, 0.33, 0.25, and 0.2). The results indicate that the pin fins enhanced the heat transfer under both stationary and oscillating conditions by up to 30%. The mechanical oscillation did not cause considerable changes in heat transfer based on the tested parameters, and the maximal heat transfer variation was less than 10%.

Original languageEnglish
Pages (from-to)720-728
Number of pages9
JournalInternational Journal of Heat and Mass Transfer
StatePublished - 1 Feb 2016


  • Heat transfer
  • Natural convection
  • Oscillation
  • Pin fin
  • Wave power generator


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