A photographic study on the effects of hydrophobic-spot size and subcooling on local film boiling

Bambang Joko Suroto, Masahiro Tashiro, Sana Hirabayashi, Sumitomo Hidaka, Masamichi Kohno, Koji Takahashi, Yasuyuki Takata

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The effects of hydrophobic circle spot size and subcooling on local film boiling phenomenon from the copper surface with single PTFE (Polytetrafluoroethylene) hydrophobic circle spot at low heat flux has been investigated. The experiments were performed using pure water as the working fluid and subcooling ranging from 0 and 10K. The heat transfer surfaces are used polished copper block with single PTFE hydrophobic circle spot of diameters 2, 4 and 6 mm, respectively. A high-speed camera was used to capture bubble dynamics and disclosed the sequence of the process leading to local film boiling. The result shows that local films boiling occurs on the PTFE circle spot at low heat flux and was triggered by the merging of neighboring bubbles. The study also showed that transition time required for change from nucleate boiling regime to local film boiling regime depends on the diameter of the hydrophobic circle spot and the subcooling. A stable local film boiling occurs at the smallest diameter of hydrophobic spot. Subcooling cause the local film boiling occur at negative superheat and oscillation of bubble dome.

Original languageEnglish
Title of host publicationASME 2013 11th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM 2013
DOIs
Publication statusPublished - Dec 1 2013
EventASME 2013 11th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM 2013 - Sapporo, Japan
Duration: Jun 16 2013Jun 19 2013

Publication series

NameASME 2013 11th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM 2013

Other

OtherASME 2013 11th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM 2013
CountryJapan
CitySapporo
Period6/16/136/19/13

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All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes
  • Process Chemistry and Technology
  • Modelling and Simulation

Cite this

Suroto, B. J., Tashiro, M., Hirabayashi, S., Hidaka, S., Kohno, M., Takahashi, K., & Takata, Y. (2013). A photographic study on the effects of hydrophobic-spot size and subcooling on local film boiling. In ASME 2013 11th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM 2013 [V001T04A007] (ASME 2013 11th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM 2013). https://doi.org/10.1115/ICNMM2013-73069