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Stability of a jet moving in a rectangular microchannel.

M G Cabezas1, M A Herrada2, José M Montanero1

  • 1Departmento de Ingeniería Mecánica, Energética y de los Materiales and Instituto de Computación Científica Avanzada (ICCAEx), Universidad de Extremadura, Avda. de Elvas s/n, E-06071 Badajoz, Spain.

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Summary
This summary is machine-generated.

This study numerically investigates capillary jet stability in microchannels. Jet adherence to walls can stabilize flow, with stability depending on flow rate adjustments, offering control over jet behavior.

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Area of Science:

  • Fluid Dynamics
  • Microfluidics
  • Nonlinear Dynamics

Background:

  • Capillary jets in microchannels are crucial for various applications.
  • Understanding their stability is key to controlling fluid behavior.
  • Previous studies have explored jet dynamics, but microchannel confinement presents unique challenges.

Purpose of the Study:

  • To numerically investigate the basic flow and linear stability of a capillary jet confined within a rectangular microchannel.
  • To analyze the influence of jet-wall interactions (adherence vs. non-adherence) on flow stability.
  • To determine the conditions under which a capillary jet can be rendered stable or unstable.

Main Methods:

  • Numerical simulation of the basic flow and linear stability analysis.
  • Calculation of the growth rate of dominant perturbation modes as a function of wavenumber.
  • Consideration of different jet-wall contact scenarios and viscosity ratios.

Main Results:

  • Flow can be stable or unstable depending on the flow rate ratio and whether the jet adheres to the walls.
  • Sufficiently small interface-to-wall distances can lead to stabilization by viscous stress.
  • Jet adherence to channel walls suppresses capillary modes, promoting flow stability.

Conclusions:

  • The stability of capillary jets in rectangular microchannels is highly sensitive to parametric conditions, including flow rate history.
  • Controlling jet-wall interactions and viscous effects offers a pathway to manipulate jet stability.
  • Theoretical predictions align with experimental observations, validating the numerical approach.