サブクール沸騰高熱流束域における伝熱面近傍の温度場の測定(熱工学,内燃機関,動力など)

• 小野 綾子

  北海道大学大学院工学研究科:(現)(独)日本原子力研究開発機構

• 坂下 弘人

  北海道大学大学院工学研究科

書誌事項

タイトル別名

• Temperature Measurements near Heating Surface at High Heat Flux in Subcooled Pool Boiling(Thermal Engineering)
• サブクール沸騰高熱流束域における伝熱面近傍の温度場の測定
• サブクール フットウ コウネツ リュウソクイキ ニ オケル デンネツメン キンボウ ノ オンドバ ノ ソクテイ

抄録

The authors conducted measurements of liquid-vapor structure in the vicinity of a heating surface for subcooled pool boiling on an upward-facing copper surface by using a conducting probe method, and reported that the macrolayer dryout model is the most appropriate model of the CHF and the reason why the CHF increase with increasing subcooling is most likely that a thick macrolayer is able to form beneath large vapor masses and the lowest heat flux of the vapor mass region shifts towards the higher heat flux. To establish a mechanistic model of the CHF for subcooled boiling, therefore, it is required to clarify effects of local subcooling on liquid-vapor behaviors in the vicinity of a heating surface. This paper presents local temperatures close to a heating surface measured with a micro-thermocouple probe at high heat fluxes for water boiling on an upward surface in the range of subcooling 0K to 40K. An effective subcooling defined as a local subcooling during a waiting period of large vapor mass formation, which is important parameter to examine behaviors of bubbles forming macrolayer, was estimated from detected bottom peaks of temperature fluctuations with time. It was found that the effective subcooling adjacent to the surface remains at considerably lower values than the bulk liquid subcooling. This means that the bulk liquid subcooling has a limited effect on behaviors of primary bubbles from nucleation to coalescence. An empirical correlation of distribution of the effective subcooling was proposed to contribute to quantitative modeling of the CHF for subcooled boiling.

収録刊行物

• 日本機械学会論文集Ｂ編

  日本機械学会論文集Ｂ編 75 (753), 1127-1134, 2009

  一般社団法人 日本機械学会

キーワード

• Pool Boiling
• Micro-Thermocouple
• Temperature Measurement
• Subcooling
• Critical Heat Flux
• Macrolayer

詳細情報

• CRID: 1390001206260853632
• NII論文ID: 110007226546
• NII書誌ID: AN00187441
• DOI: 10.1299/kikaib.75.753_1127
• ISSN: 18848346
• ISSN: 03875016
• NDL書誌ID: 10319253
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10319253
• Web Site: https://www.jstage.jst.go.jp/article/kikaib1979/75/753/75_KJ00005579238/_pdf
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可