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Related Concept Videos

Free-falling Bodies: Example01:05

Free-falling Bodies: Example

An object falling without any air resistance under the influence of gravitational force is said to be in free-fall. For free-falling bodies, the acceleration due to gravity is constant, irrespective of their mass. Free-fall is experienced not only by objects falling downward, but also by all objects whose motion is influenced by gravitational force alone. The dynamics of free-fall motion can be calculated using kinematic equations of motion, since free-fall acceleration is constant.
The...
Free-falling Bodies: Introduction01:07

Free-falling Bodies: Introduction

All objects, neglecting air resistance, fall with the same acceleration towards the Earth's center due to the force exerted by the Earth's gravity. This experimentally determined fact is unexpected because we are so accustomed to the effects of air resistance and friction that we expect light objects to fall slower than heavier ones. People believed that a heavier object had a greater acceleration when falling until Galileo Galilei (1564–1642) proved otherwise. We now know this is not the case.
Fluid Movement Between Compartments01:18

Fluid Movement Between Compartments

The force applied by fluids against a surface, known as hydrostatic pressure, initiates the transfer of fluid among different compartments. Within our blood vessels, the blood's hydrostatic pressure is a result of the heart's pumping action. At the arteriolar end of capillaries, hydrostatic pressure (capillary blood pressure) exceeds the opposing colloid osmotic pressure created primarily by plasma proteins like albumin. This discrepancy in pressure propels plasma and nutrients from the...
Excess Pressure Inside a Drop and a Bubble01:13

Excess Pressure Inside a Drop and a Bubble

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Irrotational Flow01:28

Irrotational Flow

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Related Experiment Video

Updated: Jul 6, 2026

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp
09:58

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Published on: February 3, 2014

Disappearing bodies and ghost vortices.

I Eames1

  • 1University College London, Torrington Place, London WC1E 7JE, UK.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|March 22, 2008
PubMed
Summary

Ghost vortices form in multiphase flows when bubbles or droplets disappear due to phase change. This study develops a framework to analyze ghost vortex generation and momentum conservation in these complex fluid dynamics scenarios.

Area of Science:

  • Fluid Dynamics
  • Thermodynamics
  • Multiphase Flow

Background:

  • Dispersed multiphase flows involve phase changes (condensation, evaporation, melting) of bubbles, droplets, and particles.
  • Phase changes result in the disappearance of these bodies, leaving behind 'ghost' vortices due to momentum conservation.

Purpose of the Study:

  • To develop a general framework for analyzing the generation of ghost vortices in dispersed multiphase flows.
  • To unambiguously define momentum for unbounded flows and connect it with existing expressions like Lighthill's.
  • To apply the analysis to condensing vapor bubbles and droplet evaporation.

Main Methods:

  • Development of a general theoretical framework for ghost vortex generation.
  • Analysis of momentum definition and conservation in unbounded flows.

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Last Updated: Jul 6, 2026

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp
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  • Application of integral invariants from turbulence to dispersed multiphase flows.

    • Main Results:

    • A framework is established to explain the formation of ghost vortices from disappearing bodies in multiphase flows.
    • Momentum is unambiguously defined for unbounded flows, with connections to Lighthill's formulation.
    • New perspectives on dispersed multiphase flows are introduced using integral invariants.

    Conclusions:

    • Ghost vortex formation is a direct consequence of momentum conservation during phase changes in multiphase flows.
    • The study provides a unified approach to understanding these phenomena across different applications.
    • Integral invariants offer a powerful tool for analyzing complex fluid dynamics in dispersed multiphase systems.