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Related Concept Videos

Excess Pressure Inside a Drop and a Bubble01:13

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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Surface Tension of Fluid01:22

Surface Tension of Fluid

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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...
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Eulerian and Lagrangian Flow Descriptions01:22

Eulerian and Lagrangian Flow Descriptions

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Fluid flow analysis is critical in many scientific and engineering disciplines, and two principal approaches are used to describe this flow: the Eulerian and Lagrangian methods. These methods offer different perspectives on monitoring and analyzing the motion of fluids, each with distinct advantages depending on the scenario.
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Surface Tension and Surface Energy01:16

Surface Tension and Surface Energy

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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.
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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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Typical Model Studies01:30

Typical Model Studies

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Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
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Updated: Jun 25, 2025

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
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A Moving Least-Squares/Level-Set Particle Method for Bubble and Foam Simulation.

Hui Wang, Zhi Wang, Shulin Hong

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    Summary
    This summary is machine-generated.

    This study introduces a new particle-grid method for simulating bubble and foam flow. It accurately tracks bubble interfaces and topology changes in complex fluid systems.

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    Area of Science:

    • Computational fluid dynamics
    • Multiphase flow simulation
    • Soft matter physics

    Background:

    • Simulating bubble and foam dynamics is crucial for understanding complex fluid behavior.
    • Existing methods often struggle with accurate interface tracking and topological changes.

    Purpose of the Study:

    • To develop a novel particle-grid scheme for simulating bubble and foam flow.
    • To accurately track bubble interfaces and topological changes in foaming fluid systems.

    Main Methods:

    • A particle representation combining moving least-squares particles and particle level-set methods.
    • Assigning a dedicated particle system to each bubble for interface evolution and topological changes.
    • Integrating particle systems to generate an unsigned level-set field for multiphase flow dynamics.

    Main Results:

    • Accurate simulation of individual bubble interface evolution and topological changes.
    • Effective tracking of surfactant flow physics on bubble membranes.
    • Seamless integration into a multiphase, volumetric flow solver for complex phenomena.

    Conclusions:

    • The novel particle-grid scheme enables the simulation of intricate bubble and foam phenomena.
    • The method accurately captures highly dynamic structural evolution and interfacial flow details.
    • This approach enhances the simulation of coupled multiphase flow dynamics.