Paper Number
FI8 

Session
Flow-Induced Instabilities and Non-Newtonian Fluids

Title
Viscoplastic fingerprints in two-phase flows in a pipe with a yield-stress liquid and air: Experiments, modeling, and numerical analyses

Presentation Date and Time
October 14, 2024 (Monday) 1:50

Track / Room
Track 5 / Room 405

Authors (Click on name to view author profile)

  1. Iceri, Daiane M. (Unicamp)
  2. Glaucio, Matoba K. (Unicamp)
  3. Helder, Moura L. (Unicamp)
  4. Miguel, Melendres V. (Unicamp)
  5. Brener, Bernardo P. (UFRJ)
  6. Salgado, Rafael C. (UFRJ)
  7. Thompson, Roney L. (UFRJ)
  8. Fidel-Dufour, Annie (Totalenergies)
  9. Castro, Marcelo S. (Unicamp)

Author and Affiliation Lines (in printed abstract book)
Daiane M. Iceri1, Matoba K. Glaucio1, Moura L. Helder1, Melendres V. Miguel1, Bernardo P. Brener2, Rafael C. Salgado2, Roney L. Thompson2, Annie Fidel-Dufour3 and Marcelo S. Castro1
1Unicamp, Campinas, SP, Brazil; 2UFRJ, Rio de Janeiro, Brazil; 3Totalenergies, Saint Etienne, France

Speaker / Presenter 
Thompson, Roney L.

Keywords
experimental methods; computational methods; non-Newtonian fluids

Text of Abstract
The present work analyzes the two-phase flow of a yield-stress material and air in a horizontal pipe from different perspectives. To this end, we constructed an experimental setup where these two materials are injected. The yield stress material is a solution of Carbopol and Triethalonamine whose rheology was recently analyzed by Iceri et al. (Rheol. Acta, 2023). Velocity fields for the single-phase flow of the viscoplastic material and the two-phase flow described were captured by two different techniques, particle image velocimetry (PIV) and optical flow (OF). Additionally, we performed numerical simulations with a 1-D model in commercial software but also adapted the open-source code developed by Smith et al. (J. Disp. Sci. Tech., 2015) and by Strang et al. (Algorithms, 2020), generically referred to as the NTNU model. Finally, we simulate the full 3-D two-phase flow using the open-source platform OpenFOAM. We have found some flow patterns in the two-phase flow that can be considered signatures of the presence of a yield stress fluid. In one flow pattern, the yield stress fluid gets stuck at the wall while the gas flows in the upper part of the pipe. This pattern was also obtained in the 3-D simulations. Another flow pattern produces periodic bubbles with a long tail, in a clear discrepancy with respect to their Newtonian counterpart. Results from the 1-D NTNU model provided very good agreement with global measures of the two-phase flow with a yield stress fluid, like pressure drop and bubble velocity.