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Ruben Juanes - One of the best experts on this subject based on the ideXlab platform.

  • characterizing dissipation in Fluid Fluid Displacement using constant rate spontaneous imbibition
    Physical Review Letters, 2020
    Co-Authors: Bauyrzhan Primkulov, Amir Pahlavan, Christopher W. Macminn, J Chui, Ruben Juanes
    Abstract:

    When one Fluid displaces another in a confined environment, some energy is dissipated in the Fluid bulk and the rest is dissipated near the contact line. Here we study the relative strengths of these two sources of dissipation with a novel experimental setup: constant-rate spontaneous imbibition experiments, achieved by introducing a viscous oil slug in front of the invading Fluid inside a capillary tube. We show that a large fraction of dissipation can take place near the contact line, and rationalize the observations by means of a theoretical analysis of the dynamic contact angles of the front and back menisci of the oil slug. Our results bear important implications for macroscopic descriptions of multiphase flows in microFluidic systems and porous media.

  • Signatures of Fluid–Fluid Displacement in porous media: wettability, patterns and pressures
    Journal of Fluid Mechanics, 2019
    Co-Authors: Bauyrzhan Primkulov, Amir Pahlavan, Benzhong Zhao, Christopher W. Macminn, Ruben Juanes
    Abstract:

    We develop a novel ‘moving-capacitor’ dynamic network model to simulate immiscible Fluid–Fluid Displacement in porous media. Traditional network models approximate the pore geometry as a network of fixed resistors, directly analogous to an electrical circuit. Our model additionally captures the motion of individual Fluid–Fluid interfaces through the pore geometry by completing this analogy, representing interfaces as a set of moving capacitors. By incorporating pore-scale invasion events, the model reproduces, for the first time, both the Displacement pattern and the injection-pressure signal under a wide range of capillary numbers and substrate wettabilities. We show that at high capillary numbers the invading patterns advance symmetrically through viscous fingers. In contrast, at low capillary numbers the flow is governed by the wettability-dependent Fluid–Fluid interactions with the pore structure. The signature of the transition between the two regimes manifests itself in the fluctuations of the injection-pressure signal.

  • signatures of Fluid Fluid Displacement in porous media wettability patterns and pressures
    Journal of Fluid Mechanics, 2019
    Co-Authors: Bauyrzhan Primkulov, Amir Pahlavan, Benzhong Zhao, Christopher W. Macminn, Ruben Juanes
    Abstract:

    We develop a novel ‘moving-capacitor’ dynamic network model to simulate immiscible Fluid–Fluid Displacement in porous media. Traditional network models approximate the pore geometry as a network of fixed resistors, directly analogous to an electrical circuit. Our model additionally captures the motion of individual Fluid–Fluid interfaces through the pore geometry by completing this analogy, representing interfaces as a set of moving capacitors. By incorporating pore-scale invasion events, the model reproduces, for the first time, both the Displacement pattern and the injection-pressure signal under a wide range of capillary numbers and substrate wettabilities. We show that at high capillary numbers the invading patterns advance symmetrically through viscous fingers. In contrast, at low capillary numbers the flow is governed by the wettability-dependent Fluid–Fluid interactions with the pore structure. The signature of the transition between the two regimes manifests itself in the fluctuations of the injection-pressure signal.

Bauyrzhan Primkulov - One of the best experts on this subject based on the ideXlab platform.

  • characterizing dissipation in Fluid Fluid Displacement using constant rate spontaneous imbibition
    Physical Review Letters, 2020
    Co-Authors: Bauyrzhan Primkulov, Amir Pahlavan, Christopher W. Macminn, J Chui, Ruben Juanes
    Abstract:

    When one Fluid displaces another in a confined environment, some energy is dissipated in the Fluid bulk and the rest is dissipated near the contact line. Here we study the relative strengths of these two sources of dissipation with a novel experimental setup: constant-rate spontaneous imbibition experiments, achieved by introducing a viscous oil slug in front of the invading Fluid inside a capillary tube. We show that a large fraction of dissipation can take place near the contact line, and rationalize the observations by means of a theoretical analysis of the dynamic contact angles of the front and back menisci of the oil slug. Our results bear important implications for macroscopic descriptions of multiphase flows in microFluidic systems and porous media.

  • Signatures of Fluid–Fluid Displacement in porous media: wettability, patterns and pressures
    Journal of Fluid Mechanics, 2019
    Co-Authors: Bauyrzhan Primkulov, Amir Pahlavan, Benzhong Zhao, Christopher W. Macminn, Ruben Juanes
    Abstract:

    We develop a novel ‘moving-capacitor’ dynamic network model to simulate immiscible Fluid–Fluid Displacement in porous media. Traditional network models approximate the pore geometry as a network of fixed resistors, directly analogous to an electrical circuit. Our model additionally captures the motion of individual Fluid–Fluid interfaces through the pore geometry by completing this analogy, representing interfaces as a set of moving capacitors. By incorporating pore-scale invasion events, the model reproduces, for the first time, both the Displacement pattern and the injection-pressure signal under a wide range of capillary numbers and substrate wettabilities. We show that at high capillary numbers the invading patterns advance symmetrically through viscous fingers. In contrast, at low capillary numbers the flow is governed by the wettability-dependent Fluid–Fluid interactions with the pore structure. The signature of the transition between the two regimes manifests itself in the fluctuations of the injection-pressure signal.

  • signatures of Fluid Fluid Displacement in porous media wettability patterns and pressures
    Journal of Fluid Mechanics, 2019
    Co-Authors: Bauyrzhan Primkulov, Amir Pahlavan, Benzhong Zhao, Christopher W. Macminn, Ruben Juanes
    Abstract:

    We develop a novel ‘moving-capacitor’ dynamic network model to simulate immiscible Fluid–Fluid Displacement in porous media. Traditional network models approximate the pore geometry as a network of fixed resistors, directly analogous to an electrical circuit. Our model additionally captures the motion of individual Fluid–Fluid interfaces through the pore geometry by completing this analogy, representing interfaces as a set of moving capacitors. By incorporating pore-scale invasion events, the model reproduces, for the first time, both the Displacement pattern and the injection-pressure signal under a wide range of capillary numbers and substrate wettabilities. We show that at high capillary numbers the invading patterns advance symmetrically through viscous fingers. In contrast, at low capillary numbers the flow is governed by the wettability-dependent Fluid–Fluid interactions with the pore structure. The signature of the transition between the two regimes manifests itself in the fluctuations of the injection-pressure signal.

Christopher W. Macminn - One of the best experts on this subject based on the ideXlab platform.

  • characterizing dissipation in Fluid Fluid Displacement using constant rate spontaneous imbibition
    Physical Review Letters, 2020
    Co-Authors: Bauyrzhan Primkulov, Amir Pahlavan, Christopher W. Macminn, J Chui, Ruben Juanes
    Abstract:

    When one Fluid displaces another in a confined environment, some energy is dissipated in the Fluid bulk and the rest is dissipated near the contact line. Here we study the relative strengths of these two sources of dissipation with a novel experimental setup: constant-rate spontaneous imbibition experiments, achieved by introducing a viscous oil slug in front of the invading Fluid inside a capillary tube. We show that a large fraction of dissipation can take place near the contact line, and rationalize the observations by means of a theoretical analysis of the dynamic contact angles of the front and back menisci of the oil slug. Our results bear important implications for macroscopic descriptions of multiphase flows in microFluidic systems and porous media.

  • Signatures of Fluid–Fluid Displacement in porous media: wettability, patterns and pressures
    Journal of Fluid Mechanics, 2019
    Co-Authors: Bauyrzhan Primkulov, Amir Pahlavan, Benzhong Zhao, Christopher W. Macminn, Ruben Juanes
    Abstract:

    We develop a novel ‘moving-capacitor’ dynamic network model to simulate immiscible Fluid–Fluid Displacement in porous media. Traditional network models approximate the pore geometry as a network of fixed resistors, directly analogous to an electrical circuit. Our model additionally captures the motion of individual Fluid–Fluid interfaces through the pore geometry by completing this analogy, representing interfaces as a set of moving capacitors. By incorporating pore-scale invasion events, the model reproduces, for the first time, both the Displacement pattern and the injection-pressure signal under a wide range of capillary numbers and substrate wettabilities. We show that at high capillary numbers the invading patterns advance symmetrically through viscous fingers. In contrast, at low capillary numbers the flow is governed by the wettability-dependent Fluid–Fluid interactions with the pore structure. The signature of the transition between the two regimes manifests itself in the fluctuations of the injection-pressure signal.

  • signatures of Fluid Fluid Displacement in porous media wettability patterns and pressures
    Journal of Fluid Mechanics, 2019
    Co-Authors: Bauyrzhan Primkulov, Amir Pahlavan, Benzhong Zhao, Christopher W. Macminn, Ruben Juanes
    Abstract:

    We develop a novel ‘moving-capacitor’ dynamic network model to simulate immiscible Fluid–Fluid Displacement in porous media. Traditional network models approximate the pore geometry as a network of fixed resistors, directly analogous to an electrical circuit. Our model additionally captures the motion of individual Fluid–Fluid interfaces through the pore geometry by completing this analogy, representing interfaces as a set of moving capacitors. By incorporating pore-scale invasion events, the model reproduces, for the first time, both the Displacement pattern and the injection-pressure signal under a wide range of capillary numbers and substrate wettabilities. We show that at high capillary numbers the invading patterns advance symmetrically through viscous fingers. In contrast, at low capillary numbers the flow is governed by the wettability-dependent Fluid–Fluid interactions with the pore structure. The signature of the transition between the two regimes manifests itself in the fluctuations of the injection-pressure signal.

Amir Pahlavan - One of the best experts on this subject based on the ideXlab platform.

  • characterizing dissipation in Fluid Fluid Displacement using constant rate spontaneous imbibition
    Physical Review Letters, 2020
    Co-Authors: Bauyrzhan Primkulov, Amir Pahlavan, Christopher W. Macminn, J Chui, Ruben Juanes
    Abstract:

    When one Fluid displaces another in a confined environment, some energy is dissipated in the Fluid bulk and the rest is dissipated near the contact line. Here we study the relative strengths of these two sources of dissipation with a novel experimental setup: constant-rate spontaneous imbibition experiments, achieved by introducing a viscous oil slug in front of the invading Fluid inside a capillary tube. We show that a large fraction of dissipation can take place near the contact line, and rationalize the observations by means of a theoretical analysis of the dynamic contact angles of the front and back menisci of the oil slug. Our results bear important implications for macroscopic descriptions of multiphase flows in microFluidic systems and porous media.

  • Signatures of Fluid–Fluid Displacement in porous media: wettability, patterns and pressures
    Journal of Fluid Mechanics, 2019
    Co-Authors: Bauyrzhan Primkulov, Amir Pahlavan, Benzhong Zhao, Christopher W. Macminn, Ruben Juanes
    Abstract:

    We develop a novel ‘moving-capacitor’ dynamic network model to simulate immiscible Fluid–Fluid Displacement in porous media. Traditional network models approximate the pore geometry as a network of fixed resistors, directly analogous to an electrical circuit. Our model additionally captures the motion of individual Fluid–Fluid interfaces through the pore geometry by completing this analogy, representing interfaces as a set of moving capacitors. By incorporating pore-scale invasion events, the model reproduces, for the first time, both the Displacement pattern and the injection-pressure signal under a wide range of capillary numbers and substrate wettabilities. We show that at high capillary numbers the invading patterns advance symmetrically through viscous fingers. In contrast, at low capillary numbers the flow is governed by the wettability-dependent Fluid–Fluid interactions with the pore structure. The signature of the transition between the two regimes manifests itself in the fluctuations of the injection-pressure signal.

  • signatures of Fluid Fluid Displacement in porous media wettability patterns and pressures
    Journal of Fluid Mechanics, 2019
    Co-Authors: Bauyrzhan Primkulov, Amir Pahlavan, Benzhong Zhao, Christopher W. Macminn, Ruben Juanes
    Abstract:

    We develop a novel ‘moving-capacitor’ dynamic network model to simulate immiscible Fluid–Fluid Displacement in porous media. Traditional network models approximate the pore geometry as a network of fixed resistors, directly analogous to an electrical circuit. Our model additionally captures the motion of individual Fluid–Fluid interfaces through the pore geometry by completing this analogy, representing interfaces as a set of moving capacitors. By incorporating pore-scale invasion events, the model reproduces, for the first time, both the Displacement pattern and the injection-pressure signal under a wide range of capillary numbers and substrate wettabilities. We show that at high capillary numbers the invading patterns advance symmetrically through viscous fingers. In contrast, at low capillary numbers the flow is governed by the wettability-dependent Fluid–Fluid interactions with the pore structure. The signature of the transition between the two regimes manifests itself in the fluctuations of the injection-pressure signal.

Ping Sheng - One of the best experts on this subject based on the ideXlab platform.

  • immiscible Fluid Displacement contact line dynamics and the velocity dependent capillary pressure
    Physical Review A, 1992
    Co-Authors: Ping Sheng, Minyao Zhou
    Abstract:

    The dynamics of immiscible-Fluid Displacement is studied in the simple geometry of a capillary tube. Here the interesting physics lies in the breakdown of the no-slip boundary condition near the contact line, defined as the intersection of the Fluid-Fluid interface with the solid wall. Through numerical hydrodynamic calculations, we link macroscopic-flow behavior to the microscopic parameters governing the contact-line region. It is shown that the moving contact line generates two types of frictional forces. One, the viscous stress, is responsible for the observed deformation of the Fluid-Fluid interface as the flow velocity U increases. Our calculation is in excellent agreement with prior analytic works on this aspect. In particular, our results reproduce Hoffman's scaling relation as well as the logarithmic dependence of the viscous friction on slipping length. Identical macroscopic-flow behaviors are also found to result from three different slipping models provided that their slipping lengths are each renormalized by a model-dependent constant. Besides the viscous stress, however, comparison with experiments revealed a second frictional force that varies as ${\mathit{U}}^{\mathit{x}}$, with 0x\ensuremath{\le}0.5, which is dominant at capillary numbers ${10}^{\mathrm{\ensuremath{-}}3}$. We propose that the source of this new friction is the excitation of damped capillary waves at the Fluid-Fluid interface due to contact-line motion over wall roughness. Consideration of this mechanism yields not only the correct range of x values, but also good agreement with the measured magnitude of the second frictional force. The paper concludes with an analysis of the frequency-dependent pressure response to an imposed ac velocity perturbation. An expression is derived for the critical frequency that separates the low-frequency behavior from that of the high-frequency regime.

  • dynamics of immiscible Fluid Displacement in a capillary tube
    Physical Review Letters, 1990
    Co-Authors: Minyao Zhou, Ping Sheng
    Abstract:

    Through first-principles hydrodynamic calculations, the macroscopic behavior of the Displacement of immiscible Fluids in a capillary tube is linked to the microscopic parameters governing the dynamics of the moving contact line. Comparison with experimental data reveals that the contact line is dragged by a frictional force varying as U x , where U is the mean flow velocity and x ≃ 1/2