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Polymer drag reduction in surfactant-contaminated turbulent bubbly channel flows

Daulet Izbassarov1, Zaheer Ahmed2, Pedro Costa3, Ville Vuorinen1, Outi Tammisola4, and Metin Muradoglu5,*

  • 1Department of Mechanical Engineering, Aalto University, FI-00076 Aalto, Finland
  • 2Department of Mechanical Engineering, Mehran University of Engineering and Technology, SZAB Campus, Khairpur Mir's 66020, Sindh, Pakistan
  • 3Faculty of Industrial Engineering, Mechanical Engineering and Computer Science, University of Iceland, Hjardarhagi 2-6, 107 Reykjavik, Iceland
  • 4Linné Flow Centre and SeRC, KTH Mechanics, SE-100 44 Stockholm, Sweden
  • 5Department of Mechanical Engineering, Koc University, 34450 Istanbul, Turkey

  • *mmuradoglu@ku.edu.tr
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Phys. Rev. Fluids 6, 104302 – Published 4 October, 2021

DOI: https://doi.org/10.1103/PhysRevFluids.6.104302

Abstract

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.

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Phys. Rev. Fluids 6, 104302– Published 4 October, 2021
  • Received 1 February 2021
  • Accepted 21 September 2021
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