過渡的気泡変形を伴う分散気泡流れの実効粘度変化

• 桜井 康介

  北海道大学大学院工学院

• 田坂 裕司

  北海道大学大学院工学研究院

• 村井 祐一

  北海道大学大学院工学研究院

書誌事項

タイトル別名

• Modification of Effective Viscosity on Bubbly Flows due to Transient Bubble Deformations

抄録

A new approach to deduce the effective viscosity of bubbly liquid with considering non-equilibrium bubble deformations in transient shear flows was proposed. Simultaneous measurement of the bubble shape and the spatio-temporal velocity distribution clarified that bubble deformation has delay from a variation of the local Capillary number under a transient process of flows from a stationary state to a rigid body rotation (spin-up) in a rotating cylinder. Relative viscosity of the bubbly liquid against the single phase condition estimated by the proposed method shows 60 % increase as the maximum. Such large increase of the effective viscosity cannot be introduced by mixture of spherical bubbles and bubbles with equilibrium deformations, and thus the non-equilibrium bubble deformations take a primary role on the modification of the effective viscosity in unsteady shear flows.

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 79 (797), 1-11, 2013

  一般社団法人 日本機械学会

キーワード

• Effective Viscosity of Bubbly Liquid
• Non-Equilibrium Bubble Deformation
• Transient Shear Flow

詳細情報

• CRID: 1390001206262589312
• NII論文ID: 130003374722
• DOI: 10.1299/kikaib.79.1
• ISSN: 18848346
• ISSN: 03875016
• Web Site: https://www.jstage.jst.go.jp/article/kikaib/79/797/79_1/_pdf
• 本文言語コード: ja
• データソース種別:
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  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可