Characteristics of heat transfer under boiling refrigerant transition by pool boiling of immiscible mixtures (Effects of the height of more-volatile liquid layer)

• KAWANAMI Osamu

  Department of Mechanical Engineering, University of Hyogo

• HARA Yasuhiko

  Department of Mechanical Engineering, University of Hyogo

• TAKAGAKI Naohisa

  Department of Mechanical Engineering, University of Hyogo

• HONDA Itsuro

  Department of Mechanical Engineering, University of Hyogo

Bibliographic Information

Other Title

• 非共溶性混合媒体を用いたプール沸騰における沸騰冷媒遷移時の伝熱特性（高密度低沸点媒体の液高さの影響）

Abstract

Boiling heat transfer using immiscible liquid mixtures is an innovative cooling technique for high-heat-density electronic devices. Immiscible liquid mixtures which are composed of more-volatile liquid with higher density and less-volatile liquid with lower density such as combination of FC-72 and Water are discussed here. In the case of pool boiling using immiscible liquid mixtures, more-volatile liquid on the heating surface is started boiling firstly, and then the more-volatile liquid reaches the critical heat flux as the heat flux increases. Subsequently, the less-volatile liquid is replaced with the more-volatile liquid and moves onto the heating surface, and this liquid is started boiling. This phenomenon is called a Boiling Refrigerant Transition, and the characteristics of heat transfer and flow behavior during Boiling Refrigerant Transition are not clear. Therefore, here the experiments under the conditions of various heights of more-volatile liquid layer and various mixture composed ratio by using two combinations of immiscible mixtures are carried out. The experimental results show that characteristics of heat transfer including Boiling Refrigerant Transition are only depending on the height of more-volatile liquid layer. And the relation between the observation of boiling behavior on the heating surface and characteristics of heat transfer is discussed.

Journal

• Transactions of the JSME (in Japanese)

  Transactions of the JSME (in Japanese) 85 (879), 19-00216-19-00216, 2019

  The Japan Society of Mechanical Engineers

Keywords

• Immiscible mixtures
• Pool boiling
• Heat transfer
• Boiling refrigerant transition

Details

• CRID: 1390001277396331776
• NII Article ID: 130007751280
• DOI: 10.1299/transjsme.19-00216
• ISSN: 21879761
• Web Site: https://www.jstage.jst.go.jp/article/transjsme/85/879/85_19-00216/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed