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We developed a robust microfluidic tensiometer for high-throughput measurements under harsh conditions. This device accurately calculates interfacial tension by analyzing fluid flow regimes and instabilities.

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Area of Science:

  • Fluid dynamics
  • Interfacial science
  • Microfluidics

Background:

  • Interfacial tension is crucial in multiphase flow systems.
  • Existing tensiometry methods face limitations in harsh conditions and throughput.
  • Dynamic microfluidic approaches offer potential for advanced measurements.

Purpose of the Study:

  • To present a novel dynamic microfluidic tensiometer.
  • To enable high-throughput interfacial tension measurements.
  • To validate measurements under extreme conditions (high pressure, temperature, salinity, crude oil).

Main Methods:

  • Utilized a dynamic microfluidic tensiometer with coaxial capillaries.
  • Injected two immiscible fluids to generate droplets or jetting regimes.
  • Analyzed the transition between flow regimes using Rayleigh-Plateau instability theory.
  • Employed linear analysis of convective and absolute instabilities for theoretical computation.

Main Results:

  • The microfluidic tensiometer successfully performed measurements over four decades.
  • The device demonstrated robustness in high-pressure, high-temperature, high-salinity, and crude oil environments.
  • The Rayleigh-Plateau instability transition accurately predicted interfacial tension.

Conclusions:

  • The dynamic microfluidic tensiometer is a versatile tool for interfacial tension measurements.
  • The device is suitable for high-throughput screening and challenging industrial applications.
  • Theoretical modeling of flow instabilities provides a reliable method for interfacial tension calculation.