2015
DOI: 10.1017/jfm.2015.244
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On the transport of heavy particles through a downward displacement-ventilated space

Abstract: We investigate the transport of relatively heavy, small particles through a downward displacement-ventilated space. A flux of particles is supplied to the space from a localised source at a high level and forms a turbulent particle-laden plume which descends through the space. A constant flow of ambient fluid which does not contain particles is supplied to the space at a high level, while an equal amount of fluid is vented from the space at a low level. As a result of the entrainment of ambient fluid into the … Show more

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Cited by 7 publications
(4 citation statements)
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References 23 publications
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“…The initial buoyancy at the source is given by go=gfgp=(ρfρambρambρpρambρambC)g, where subscript f and p denote fresh water and particles, respectively, and where ρ amb is the density of the ambient fluid at the level of the source (see figure 10), while C is the concentration of particles in the source fluid (cf. [33], see tables 1–3). The simple argument given earlier in the paper suggests that to good approximation, at the neutral buoyancy height, the diluted source fluid has a buoyancy 0.22 N 2 H , which corresponds to the fluid at a height of H o = 0.22 H of the total plume height.…”
Section: Volcanic Plumesmentioning
confidence: 99%
“…The initial buoyancy at the source is given by go=gfgp=(ρfρambρambρpρambρambC)g, where subscript f and p denote fresh water and particles, respectively, and where ρ amb is the density of the ambient fluid at the level of the source (see figure 10), while C is the concentration of particles in the source fluid (cf. [33], see tables 1–3). The simple argument given earlier in the paper suggests that to good approximation, at the neutral buoyancy height, the diluted source fluid has a buoyancy 0.22 N 2 H , which corresponds to the fluid at a height of H o = 0.22 H of the total plume height.…”
Section: Volcanic Plumesmentioning
confidence: 99%
“…For example, in the case in which a space is cooled by a high-level chilling system, downward-propagating plumes develop, which flow in the same direction as the falling heavy particulate. This leads to a very different set of controls on the dispersal of contaminants, which we present in a companion study (Mingotti & Woods 2015). using our experimental technique the mass of particles was conserved in the tank, with errors of approximately 2-5%.…”
Section: Discussionmentioning
confidence: 95%
“…Although this approximation is based on the assumption that the particles are spherical in shape, previous studies of particle-laden flows that use the same silicon carbide particles have shown that the measured sedimentation speed shows good agreement with the estimates based on Stokes law (Mingotti and Woods, 2015;Newland and Woods, 2021).…”
Section: Methodsmentioning
confidence: 93%