Laminarization of Strongly Heated Annular Gas Flows

• TORII Shuichi

• SHIMIZU Akihiko

• HASEGAWA Shu

• KUSAMA Nobuyuki

抄録

This paper aims to clarify the laminarization phenomena of strongly heated gas flows within concentric annular tubes. In the first place, the authors' former experimental results, in which annular flows were strongly heated exclusively from the inner side of the annulus, are examined by means of a k-ε model that was previously modified by the authors so as to reproduce the laminarization of strongly heated circular tube flows. Numerical results indicate a certain amount of turbulent kinetic energy remains in the flow field so that the observed heat transfer reduction is judged not to be due to laminarization, and the attention is turned to the case in which the flow is heated from both sides. A remarkable reduction in heat transfer is observed in both numerical and experimental results, and the corresponding turbulent kinetic energy is found to be uniformly attenuated over the whole tube cross section so that it is concluded that the reduction is certainly due to laminarization. Following the results, some discussions are developed on the occurrence criteria of laminarization of the annular flows, and the obtained criteria are in fairly good agreement with the experimental results by Ogawa et al.

収録刊行物

• JSME international journal. Ser. 2, Fluids engineering, heat transfer, power, combustion, thermophysical properties

  JSME international journal. Ser. 2, Fluids engineering, heat transfer, power, combustion, thermophysical properties 34 (2), 157-168, 1991

  一般社団法人 日本機械学会

キーワード

• Laminarization
• k-ε Turbulence Model
• Convective Heat Transfer
• Annular Flow
• High Heat Flux

詳細情報

• CRID: 1390001205426976512
• NII論文ID: 110002493366
• NII書誌ID: AA10680596
• DOI: 10.1299/jsmeb1988.34.2_157
• ISSN: 09148817
• Web Site: https://www.jstage.jst.go.jp/article/jsmeb1988/34/2/34_2_157/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可