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Excess Pressure Inside a Drop and a Bubble

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The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.

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Related Experiment Video

Updated: Dec 1, 2025

Microfluidic Fabrication Techniques for High-Pressure Testing of Microscale Supercritical CO2 Foam Transport in Fractured Unconventional Reservoirs

Microfluidic Fabrication Techniques for High-Pressure Testing of Microscale Supercritical CO2 Foam Transport in Fractured Unconventional Reservoirs

Published on: July 2, 2020

Single bubble and drop techniques for characterizing foams and emulsions.

V Chandran Suja¹, M Rodríguez-Hakim², J Tajuelo³

¹Department of Chemical Engineering, Stanford University, Stanford, California 94305, USA.

Advances in Colloid and Interface Science

|November 8, 2020

Summary

Single bubble and drop tests offer new insights into foam and emulsion physics, revealing crucial details about rheology and stability. These advanced techniques enhance our understanding of complex fluid behaviors.

Keywords:

Coalescence time distributions Emulsions Foams Interfacial rheology Thin film interferometry

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Last Updated: Dec 1, 2025

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Area of Science:

Colloid and Surface Science
Soft Matter Physics

Background:

Traditional bulk and single film methods have limitations in studying foams and emulsions.
Single bubble/drop techniques offer a complementary approach to probe these complex systems.

Purpose of the Study:

To review single bubble/drop platforms and experimental protocols for studying foams and emulsions.
To summarize recent advancements in foam and emulsion science using these techniques.
To identify future research directions in the field.

Main Methods:

Discussion of various single bubble/drop platforms.
Detailed explanation of experimental measurement protocols.
Analysis of thin film profiles and interfacial rheology.

Main Results:

Single bubble/drop techniques enable detailed characterization of rheology, stabilization, and rupture dynamics.
Coalescence time distributions can be accurately constructed.
Interfacial rheological properties are effectively measured.

Conclusions:

Single bubble/drop techniques are powerful tools for understanding foam and emulsion physics.
These methods provide valuable data for characterizing complex fluid interfaces.
Further research is needed to fully exploit the potential of these techniques.