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Polymer drag reduction in surfactant-contaminated turbulent bubbly channel flows
Aalto Univ, Dept Mech Engn, FI-00076 Aalto, Finland..
Mehran Univ Engn & Technol, Dept Mech Engn, SZAB Campus, Khairpur Mirs 66020, Sindh, Pakistan..
Univ Iceland, Fac Ind Engn Mech Engn & Comp Sci, Hjardarhagi 2-6, IS-107 Reykjavik, Iceland..ORCID iD: 0000-0001-7010-1040
Aalto Univ, Dept Mech Engn, FI-00076 Aalto, Finland..
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2021 (English)In: Physical Review Fluids, E-ISSN 2469-990X, Vol. 6, no 10, article id 104302Article in journal (Refereed) Published
Abstract [en]

Polymer additives are commonly utilized to manipulate bubbly flows in various applications. Here we investigate the effects of clean and contaminated bubbles driven upward (upflow) in Newtonian and viscoelastic turbulent channel flows. Interface-resolved direct numerical simulations are performed to examine sole and combined effects of soluble surfactant and viscoelasticity using an efficient three-dimensional finite-difference-front-tracking method. The incompressible flow equations are solved fully coupled with the FENE-P viscoelastic model and the equations governing interfacial and bulk surfactant concentrations. The latter coupling is accomplished by a nonlinear equation of state that relates the surface tension to the surfactant concentration. For Newtonian turbulent bubbly flows, the effects of Triton X-100 and 1-pentanol surfactant are examined. It is observed that the sorption kinetics highly affect the dynamics of bubbly flow. A minute amount of Triton X-100 is found to be sufficient to prevent the formation of bubble clusters restoring the single-phase behavior while even two orders of magnitude more 1-pentanol surfactant is not adequate to prevent the formation of layers. For viscoelastic turbulent flows, it is found that the viscoelasticity promotes formation of the bubble wall-layers and thus the polymer drag reduction is completely lost for the surfactant-free bubbly flows, while the addition of small amount of surfactant (Triton X-100) in this system restores the polymer drag reduction resulting in 25% drag reduction for the Wi = 4 case.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2021. Vol. 6, no 10, article id 104302
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-304069DOI: 10.1103/PhysRevFluids.6.104302ISI: 000704799500004Scopus ID: 2-s2.0-85117185929OAI: oai:DiVA.org:kth-304069DiVA, id: diva2:1606594
Note

QC 20211028

Available from: 2021-10-28 Created: 2021-10-28 Last updated: 2024-03-18Bibliographically approved

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Costa, PedroTammisola, Outi

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Fluid Mechanics and Engineering AcousticsLinné Flow Center, FLOWSeRC - Swedish e-Science Research Centre
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