On the transport of heavy particles through an upward displacement-ventilated space

@article{Mingotti2015OnTT,
  title={On the transport of heavy particles through an upward displacement-ventilated space},
  author={Nicola Mingotti and Andrew W. Woods},
  journal={Journal of Fluid Mechanics},
  year={2015},
  volume={772},
  pages={478 - 507}
}
  • N. Mingotti, A. Woods
  • Published 7 May 2015
  • Physics, Environmental Science
  • Journal of Fluid Mechanics
We explore the transport of heavy particles through an upward displacement-ventilated space. The space incorporates a localised source of buoyancy which generates a turbulent buoyant plume. The plume fluid is contaminated with a small concentration of particles, which are subject to gravitational settling. A constant flow of uncontaminated fluid is supplied at a low level into the space, while an equal amount of fluid is vented from the space at a high level. At steady state, a two-layer… 

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References

SHOWING 1-10 OF 28 REFERENCES

Jets and plumes with negative or reversing buoyancy

  • J. Turner
  • Physics, Environmental Science
    Journal of Fluid Mechanics
  • 1966
The motion of turbulent jets of heavy salt solution injected upwards into a tank of fresh water has been compared with that of plumes which are initially buoyant but become heavy as they mix with the

Sedimentation from gravity currents generated by turbulent plumes

Sedimentation from radially spreading gravity currents generated at the top of ascending sediment-laden plumes is described by a model which assumes that sediment is dispersed homogeneously by

Particle transport in low-energy ventilation systems. Part 1: theory of steady states.

TLDR
It is illustrated that while average concentration of particles for traditional mixing systems and low energy displacement systems are similar, local concentrations can vary significantly with displacement systems, and engineers should take due diligence accordingly when designing ventilation systems.

Patterns of sedimentation from surface currents generated by turbulent plumes

A theoretical model was developed for the dynamics and deposition pattern from gravity currents generated by axisymmetric particle-laden plumes. This model incorporates the interaction between the

Turbulent gravitational convection from maintained and instantaneous sources

  • B. MortonG. TaylorJ. Turner
  • Physics, Environmental Science
    Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences
  • 1956
Theories of convection from maintained and instantaneous sources of buoyancy are developed, using methods which are applicable to stratified body fluids with any variation of density with height;

Emptying filling boxes: the fluid mechanics of natural ventilation

This paper describes the fluid mechanics of the natural ventilation of a space connected to a large body of stationary ambient fluid. The flows are driven by buoyancy differences between the interior

Turbulent fountains in a stratified fluid

The turbulent fountain that results from the injection of a dense fluid upwards into a large tank of stably stratified fluid of lower density is studied experimentally and theoretically. For both

Particle transport in low-energy ventilation systems. Part 2: Transients and experiments.

TLDR
It is found that, on average, traditional and low-energy systems can be similar in overall pollutant removal efficiency, although quite different vertical gradients can exist, which plays an important role in estimating occupant exposure to contaminant.

Turbulent buoyant convection from a maintained source of buoyancy in a narrow vertical tank

Abstract We describe new experiments to examine the buoyancy-induced mixing which results from the injection of a small constant volume flux of fluid of density ${\rho }_{s} $ at the top of a long

Particle recycling in the TAG hydrothermal plume