Effect of the gap height between the vibration plate and heating surface on boiling heat transfer in a boiling bubble resonator

Noriyuki Unno, Kazuhisa Yuki, Jun Taniguchi, Shin Ichi Satake

Research output: Contribution to journalArticlepeer-review

Abstract

For boiling heat transfer, it is important to improve both the critical heat flux and heat transfer coefficient. In general, the heat transfer coefficient is improved by promoting the nucleation of boiling bubbles on the heating surface. However, this decreases the critical heat flux. To improve the heat transfer coefficient without decreasing the critical heat flux, we previously developed a technique using a boiling bubble resonator, which consists of a material attached close to the heating surface that vibrates in response to the growth and collapse of boiling bubbles. In this study, we used spacer plates to vary the gap height between the heating surface and boiling bubble resonator to maximize the boiling heat transfer. By optimizing the gap height, the wall superheat decreased by 7 and 25 K at 0.8 and 5.6 MW/m2, respectively. The maximum heat flux was 5.8 MW/m2 with the optimized gap height. In addition, we observed sound signals when the boiling bubble resonator was optimally vibrating. Moreover, jet flow from the gap appeared with the vibration of the boiling bubble resonator.

Original languageEnglish
Article numberJTST0017
Pages (from-to)1-12
Number of pages12
JournalJournal of Thermal Science and Technology
Volume16
Issue number2
DOIs
Publication statusPublished - 2021

Keywords

  • Boiling bubble resonator
  • Boiling heat transfer
  • FFT analysis
  • Self-excited vibration

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