TY - JOUR

T1 - Influence of Sinusoidal Perturbations in the Dispersed Phase Flow Rate on the Flow Characteristics of Immiscible Viscous Liquids in a T-Junction Microchannel

AU - Kovalev, A. V.

AU - Yagodnitsyna, A. A.

AU - Bilsky, A. V.

N1 - This work was supported by the Russian Science Foundation (Project No. 21-79-10307). Публикация для корректировки.

PY - 2023/6

Y1 - 2023/6

N2 - The influence of sinusoidal pulsations in the dispersed phase flow rate on the flow characteristics of immiscible high-viscosity liquids in a T-junction microchannel was studied. The flow regimes in the unperturbed flow and in the flow subjected to external perturbations with different frequencies and amplitudes were visualized. A dimensionless complex is proposed that describes the transition from parallel to plug flow due to external perturbations for a fixed capillary number of the carrier phase. The application of perturbations to the plug flow regime was found to lead to flow stabilization and to a reduction in the range of lengths of the generated plugs at a frequency equal to the natural frequency of plug formation in the unperturbed flow. The average plug length and the range of its values are shown to increase with decreasing perturbation frequency.

AB - The influence of sinusoidal pulsations in the dispersed phase flow rate on the flow characteristics of immiscible high-viscosity liquids in a T-junction microchannel was studied. The flow regimes in the unperturbed flow and in the flow subjected to external perturbations with different frequencies and amplitudes were visualized. A dimensionless complex is proposed that describes the transition from parallel to plug flow due to external perturbations for a fixed capillary number of the carrier phase. The application of perturbations to the plug flow regime was found to lead to flow stabilization and to a reduction in the range of lengths of the generated plugs at a frequency equal to the natural frequency of plug formation in the unperturbed flow. The average plug length and the range of its values are shown to increase with decreasing perturbation frequency.

KW - external perturbations

KW - liquid–liquid flows

KW - microchannels

KW - plug flow

KW - pulsations

KW - stability of parallel flow

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85168412107&origin=inward&txGid=8901e8bc11b9623b2fde5ade039723d9

UR - https://www.mendeley.com/catalogue/69b613cb-4c0c-34ff-8e3d-c335f2e36fed/

U2 - 10.1134/S0021894423030033

DO - 10.1134/S0021894423030033

M3 - Article

VL - 64

SP - 378

EP - 387

JO - Journal of Applied Mechanics and Technical Physics

JF - Journal of Applied Mechanics and Technical Physics

SN - 0021-8944

IS - 3

ER -