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Surface Tension of Fluid

Surface Tension of Fluid

Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies with...

Surface Tension, Capillary Action, and Viscosity

Surface Tension, Capillary Action, and Viscosity

Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...

Surface Tension and Surface Energy

Surface Tension and Surface Energy

When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...

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.

Surface Tension

Surface Tension

Surface tension is defined as the force per unit length (γ) acting along the surface of a liquid. It arises due to strong intermolecular forces of attraction. A molecule located inside the bulk of the liquid is surrounded by other molecules and experiences equal forces in all directions. However, a molecule at the surface experiences unbalanced forces because there are more neighboring molecules below than above. This creates a net inward force that pulls surface molecules toward the interior,...

Surface Active Agents

Surface Active Agents

Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...

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Updated: Jun 27, 2026

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Published on: September 9, 2022

Specific surface area model for foam permeability.

O Pitois¹, E Lorenceau, N Louvet

¹Universite Paris-Est, Laboratoire de Physique des Materiaux Divises et des Interfaces, UMR CNRS 8108, 5 bvd Descartes, 77454 Marne la Vallee Cedex 2, France. olivier.pitois@univ-mlv.fr

Langmuir : the ACS Journal of Surfaces and Colloids

|November 27, 2008

Summary

This summary is machine-generated.

The Carman-Kozeny model accurately predicts liquid foam permeability by incorporating an equivalent specific surface area, bridging the gap between solid porous materials and liquid foams.

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Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices

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Area of Science:

Materials Science
Fluid Dynamics
Colloid Science

Background:

Liquid foams are recognized as porous materials with liquid flow between gas bubbles.
Existing foam permeability models are based on microscopic pore geometry, drawing parallels to solid porous materials.

Purpose of the Study:

To investigate the applicability of the Carman-Kozeny model, typically used for solid porous materials, to liquid foams.
To determine if theoretical frameworks for solid porous materials can be extended to understand liquid foam behavior.

Main Methods:

Experimental measurement of liquid foam permeability using foams with non-mobile surfactants.
Application and validation of the Carman-Kozeny model by introducing an equivalent specific surface area for foams.

Main Results:

The Carman-Kozeny model accurately describes experimental foam permeability data across two orders of magnitude of liquid fraction.
The model requires no additional parameters beyond the equivalent specific surface area for foams.
The proposed model encompasses previous permeability models for dry foams.

Conclusions:

The Carman-Kozeny model is a robust and applicable tool for predicting liquid foam permeability.
The concept of equivalent specific surface area effectively bridges the properties of solid porous media and liquid foams.
This research provides a unified approach to understanding permeability in both solid and liquid porous systems.