粘弾性流体の乱流境界層抵抗低減効果に及ぼすレオロジー特性の影響(流体工学,流体機械)

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タイトル別名
  • Effects of Rheological Properties on Drag Reduction in Turbulent Boundary Layer of Viscoelastic Fluids(Fluids Engineering)
  • 粘弾性流体の乱流境界層抵抗低減効果に及ぼすレオロジー特性の影響
  • ネンダンセイ リュウタイ ノ ランリュウ キョウカイソウ テイコウ テイゲン コウカ ニ オヨボス レオロジー トクセイ ノ エイキョウ

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抄録

Direct numerical simulation of a zero-pressure gradient drag-reducing turbulent boundary layer of viscoelastic fluids was systematically performed at the momentum-thickness Reynolds number Re_<θ_0>=500 and Weissenberg number We=25 using constitutive equation models such as the Oldroyd-B, Giesekus (the mobility factor α=0.01, 0.001, 0.0001) and FENE-P models (the extensibility parameter L^2=100, 1000, 10000), where the ratio of zero shear rate solvent viscosity to solution viscosity, β, was 0.9, 0.99, and 0.999. In the case that the elongational viscosity for the steady elongational flow was identical, the relation between the streamwise variation of the drag reduction ratio and the rheological properties for the steady shear flow such as the shear-thinning, first and second normal stress difference coefficients was clarified.

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