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Accurate Determination of the Equilibrium Surface Tension Values with Area Perturbation Tests
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Dynamic interfacial tension measurement method using axisymmetric drop shape analysis.

Nikhil Bagalkot1, Aly A Hamouda1, Ole Morten Isdahl1

  • 1Department of Energy and Petroleum Engineering, University of Stavanger, Norway.

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|July 11, 2018
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Summary
This summary is machine-generated.

This study presents a simple modification for measuring interfacial tension (IFT) using Axisymmetric Drop Shape Analysis (ADSA). The method accurately calculates phase densities, accounting for gas solubility, for dynamic IFT measurements in multiphase systems.

Keywords:
Dynamic IFTDynamic IFT measurementDynamic densityMultiphasePendant drop method

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Area of Science:

  • Physical Chemistry
  • Chemical Engineering
  • Materials Science

Background:

  • Accurate interfacial tension (IFT) measurement is crucial for understanding multiphase systems.
  • Dynamic IFT measurements using Axisymmetric Drop Shape Analysis (ADSA) are challenged by the need for precise phase densities, especially with gas-liquid systems.
  • Existing methods often require complex equipment or state-of-the-art equations of state.

Purpose of the Study:

  • To introduce a straightforward and cost-effective modification to the ADSA pendant drop technique for dynamic and equilibrium IFT measurements.
  • To address the challenge of determining accurate phase densities in gas-liquid and liquid-liquid systems under high pressure and temperature.
  • To enable simultaneous determination of IFT, phase composition, and density changes over time.

Main Methods:

  • A modified Axisymmetric Drop Shape Analysis (ADSA) pendant drop technique was employed.
  • Phase densities were calculated as a function of time, incorporating gas solubility in liquids.
  • The calculated densities were used as input for IFT measurements within a high pressure and temperature PVT cell.

Main Results:

  • The developed method allows for accurate dynamic and equilibrium interfacial tension (IFT) measurements.
  • It enables the determination of binary mixture composition (mole and mass) and density variations due to mass transfer over time.
  • The technique is cost-effective, avoiding the need for additional density meters or complex equations of state.

Conclusions:

  • The modified ADSA method provides a simple, cost-effective approach for dynamic IFT measurements in multiphase systems.
  • Accurate phase density determination, considering gas solubility, is key to reliable IFT measurements.
  • This technique facilitates a deeper understanding of mass transfer phenomena and fluid behavior under various conditions.