Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session F26: General Fluid Dynamics: Drag Reduction, Obstacles and Constrictions
8:00 AM–10:10 AM,
Monday, November 19, 2018
Georgia World Congress Center
Room: B314
Chair: Jonathan Clausen, Sandia National Lab
Abstract ID: BAPS.2018.DFD.F26.6
Abstract: F26.00006 : Turbulent drag reduction by compliant surface tension active wall layer
9:05 AM–9:18 AM
Presenter:
Alfredo Soldati
(Institute of Fluid Mechanics and Heat Transfer, TU Wien, Dipartimento Politecnico di Ingegneria e Architettura, Università di Udine)
Authors:
Alfredo Soldati
(Institute of Fluid Mechanics and Heat Transfer, TU Wien, Dipartimento Politecnico di Ingegneria e Architettura, Università di Udine)
Alessio Roccon
(Institute of Fluid Mechanics and Heat Transfer, TU Wien, Dipartimento Politecnico di Ingegneria e Architettura, Università di Udine)
Francesco Zonta
(Institute of Fluid Mechanics and Heat Transfer, TU Wien)
In this work we use Direct Numerical Simulation (DNS) together with a Phase Field technique to study the turbulent Poiseuille flow of two immiscible liquid layers inside a channel. A thin liquid layer (fluid 1) flows on top of a thick liquid layer (fluid 2), such that their thickness ratio is h1/h2 = 0.075. The two liquid layers have the same density but different viscosities η, specifically we consider the case η1 < η2. The problem is described by the shear Reynolds number (Reτ), by the Weber number (We, which quantifies surface tension effects) and by the viscosity ratio λ (ratio between the viscosity of the two fluids). Compared to a single phase flow at the same shear Reynolds number (Reτ = 300), in the stratified case we observe an increase of the flow rate of fluid 2 and a strong modification of the turbulence structures near the liquid-liquid interface. Altogether, these observations support the presence of a significant Drag Reduction (DR), whose efficiency depends strongly on the viscosity ratio (λ).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.F26.6
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