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Particle Interactions in a Fluid Flow

a fluid flow and particle technology, applied in water supply installations, auxillary pretreatment, separation processes, etc., can solve the problems and achieve the effect of increasing the likelihood of collision or interaction between particles

Inactive Publication Date: 2008-04-17
INDIGO TECH GRP PTY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The invention is based on the discovery that two particles in a fluid flow will respond differently to a turbulent eddy of a specific size. By creating turbulent eddies of a specific size, particles can be entrained in the eddies to different extents, resulting in a higher likelihood of interactions between the particles. The invention provides a method and apparatus for promoting interaction between different types of particles in a fluid stream by generating turbulent eddies of a specific size. This can be useful in various applications, such as pollution control, where the goal is to agglomerate or remove particles from the fluid stream."

Problems solved by technology

Consequently, the likelihood of collision or interaction between the particles is increased.

Method used

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  • Particle Interactions in a Fluid Flow
  • Particle Interactions in a Fluid Flow
  • Particle Interactions in a Fluid Flow

Examples

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Embodiment Construction

[0053]In a preferred embodiment, this invention involves the use of turbulent eddies to manipulate the relative trajectories of very small pollutant particles and larger collector particles carried by a flowing fluid, which is typically an exhaust gas stream from an industrial process, to increase the probability of the particles colliding or interacting to agglomerate, or otherwise react with each other, to form more easily removable particles. A formation is designed to provide turbulence of the required size and scale to cause the different species of particles to have substantially differential slip velocities.

[0054]The turbulence should be such that the Stokes Number (St) of the small pollutant particles is much less than 1 (St>1).

[0055]The Stokes number (St) is a theoretical measure of the ability of a particle to follow a turbulence streamline. The Stokes number is defined as the ratio of the particle response time to a fluid flow time and is characterised by:

St=τp / τfρp U dp2...

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Abstract

Interaction between two different species of particle(s) in a fluid stream is promoted by generating turbulent eddies in a fluid stream. The turbulent eddies are designed to be of such size and / or intensity that the different sized particle(s) are entrained into the eddies to significantly different extents and forced to follow different trajectories, increasing the likelihood of collisions and interactions. Optimum collision rates will occur for a system which maintains a Stokes Number much less than 1 for one sized particle, and or order 1 or greater for the other sized particle. The invention has particular application in air pollution control, whereby agglomeration of fine particles into larger particles is promoted, subsequent to their removal.

Description

[0001]This invention relates generally to a method and apparatus for promoting or increasing interactions between different types of particles in a fluid flow. The invention provides a method of designing a formation of vortex generators to generate particle scale turbulence to cause interactions between particular types of particles in a fluid flow in a highly efficient manner.[0002]The invention has particular application in air pollution control, by promoting agglomeration of fine pollutant particles in air streams into larger particles to thereby facilitate their subsequent filtration or other removal from the air streams, although the invention is not limited to that application.BACKGROUND ART[0003]Many industrial processes result in the emission of small hazardous particles into the atmosphere. These particles often include very fine sub-micron particles of toxic compounds which are easily inhaled. Their combination of toxicity and ease of respiration has prompted governments ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F15D1/10B01F3/06B01F5/00B01D51/02B01F23/00B01F23/30B01J2/16
CPCB01D51/02B01F5/0618B01J2/16B01F2215/0431B01F5/0643Y10T137/87652Y10T137/0318B01F25/4316B01F25/4322F15D1/10B03C3/00F15D1/04B01D51/00
Inventor TRUCE, RODNEY JOHNWILKINS, JOHN WALTERNATHAN, GRAHAM JERROLDKELSO, RICHARD MALCOLMKALT, PETER ANTHONY MARKUS
Owner INDIGO TECH GRP PTY LTD
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