# 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}
}
• 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…
14 Citations

### Multiphase plumes in a stratified ambient

• Environmental Science
Journal of Fluid Mechanics
• 2019
We report on experiments of turbulent particle-laden plumes descending through a stratified environment. We show that provided the characteristic plume speed $(B_{0}N)^{1/4}$ exceeds the particle

### Collapse of particle-laden buoyant plumes

• Environmental Science, Physics
Journal of Fluid Mechanics
• 2019
Particle loading affects the dynamics of buoyant plumes, since the difference between particle and fluid densities is much greater than that in the fluid alone. In stratified environments, plume rise

### Particle fountains in a confined environment

• Physics
Journal of Fluid Mechanics
• 2018
We present new experiments and theoretical models of the motion of relatively dense particles carried upwards by a liquid jet into a laterally confined space filled with the same liquid. The incoming

### Mixing and reaction in turbulent plumes: the limits of slow and instantaneous chemical kinetics

• Chemistry
Journal of Fluid Mechanics
• 2018
We investigate the behaviour of a reactive plume in the two limiting cases of slow and instantaneous chemical reactions. New laboratory measurements show that, whereas the slow reaction between the

### Micro-droplet nucleation through solvent exchange in a turbulent buoyant jet

• Physics
Journal of Fluid Mechanics
• 2022
Abstract Solvent exchange is a process involving mixing between a good solvent with dissolved solute and a poor solvent. The process creates local oversaturation which causes the nucleation of minute

### On turbulent particle fountains

• Physics
Journal of Fluid Mechanics
• 2016
We describe new experiments in which particle-laden turbulent fountains with source Froude numbers $20>Fr_{0}>6$ are produced when particle-laden fresh water is injected upwards into a reservoir

### Confronting Grand Challenges in environmental fluid mechanics

• Environmental Science
Physical Review Fluids
• 2021
Environmental fluid mechanics underlies a wealth of natural, industrial and, by extension, societal challenges. In the coming decades, as we strive towards a more sustainable planet, there are a wide

### Effects of ventilation on the indoor spread of COVID-19

• Engineering
Journal of Fluid Mechanics
• 2020
The role of building ventilation on the possible pathways of airborne particles and the fluid mechanics of the processes involved in indoor transmission of SARS-CoV-2 are discussed.

### Innovative practice in the manufacture of aseptic surgical environments in the late nineteenth century

• Engineering
Journal of Architectural Conservation
• 2021
ABSTRACT Contemporary spaces for surgery are highly energy intensive, much of which is attributed to powerful air conditioning systems intended to force air down onto the patient, surgical staff and

## 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

• Geology, Environmental Science
• 1991
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.

• Engineering
Indoor air
• 2009
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

• Environmental Science
• 2000
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

• 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

• Physics
Journal of Fluid Mechanics
• 1990
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

• Physics
Journal of Fluid Mechanics
• 1998
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.

• Engineering
Indoor air
• 2009
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

• Physics
Journal of Fluid Mechanics
• 2012
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