The Effects of Longitudinal Vortices on Heat Transfer of Laminar Boundary Layers

• TORII K.

  Faculty of Engineering, Yokohama National University

• YANAGIHARA Jurandir Itizo

  Faculty of Engineering, Yokohama National University

抄録

The isolated influence of longitudinal vortices "far enough" from a half-delta wing vortex generator on heat transfer of an otherwise laminar boundary layer was experimentally investigated. The heat transfer measurements were performed using a constant heat-flux surface with 96 embedded thermocouples. The vortex generator's height and angle of attack were varied to account for the influence of the vortex size, position and strength. A large increase in the heat transfer coefficient was found to be associated with the onset of the transition to turbulence rather than to vortical motion. The longitudinal vortices generated inside and outside the boundary layer showed different effects on heat transfer. When the transition did not occur, it was observed that the higher heat transfer coefficients were associated with the downwash region of the vortex, because of the local thinning of the boundary layer. The transition started in the upwash region of the vortex, where the instability was larger.

収録刊行物

• JSME International Journal, Ser. Ii

  JSME International Journal, Ser. Ii 32 395-402, 1989

  一般社団法人日本機械学会

キーワード

• Boundary Layer
• Heat Transfer Enhancement
• Longitudinal Vortices
• Three-Dimensional Flow
• Transition
• Half-Delta Wing
• Heat Transfer Measurements

詳細情報

• CRID: 1571698602107358208
• NII論文ID: 110002494278
• NII書誌ID: AA10680596
• ISSN: 09148817
• 本文言語コード: en
• データソース種別:
  • CiNii Articles