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Showing 1 to 20 of 21 for “"Fluidisation"”.
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Modelling of an industrial fluidised bed dryer
… relationship between the operating parameters, fluidisation regimes and drying performance, the drying of industrial nylon-6.6 polymer particles (Geldart Type D) was studied both at laboratory and industrial-scale. At laboratory-scale, theoretical single-phase models using Chilton-Colburn …
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Experimental investigation of leakage-induced pipe erosion outside of pipe leaks
… the granular particles to move freely. This fluidisation mechanism is known as internal fluidisation. The concept of internal fluidisation offers an explanation for the erosion of pipe material adjacent to pipe leaks. In this study, the removal of pipe material adjacent to leaks due to …
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A laboratory investigation of the effect of flow rate and bedding characteristics on the interaction of a vertical water jet with an idealised soil medium
… causes the granular medium to fluidise. This fluidisation process was seen to exhibit complex behaviour, which restricted shallow leaks under relatively high pipe pressures from growing and reaching the bed surface. As a result, leaks are able to remain bound beneath the ground surface with …
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Compositional and analytical factors affecting the stickiness of dairy powders
… of lactose-containing dairy powders. Using a fluidisation technique, this work demonstrated that stickiness increased with decreasing particle size for lactose-containing dairy powders. Stickiness may be characterised using a number of different instrumental approaches, which can be …
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Development and testing of experimental equipment to measure pore pressure and dynamic pressure at points outside a pipe leak
… has found that a phenomenon called internal fluidisation typically occurs in the soils outside of leaks in distribution mains. Internal fluidisation is a complex interaction between the leak and the surrounding soil, whereby the soil losses its intermolecular bonding and becomes displaced by …
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Studies in three phase gas-liquid-solid fluidised systems
… involving three-phase, gas-liquid-solid fluidisation; such systems are in increasing use. It is believed that this is one of few studies concerned with `true' three-phase, gas-liquid-solid fluidised systems, and that this work will contribute significantly to closing some of the gaps in …
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Crystal mobilisation in convecting magma chambers: an analogue experimental approach
… of mobilisation can be explained by the fluidisation of a particle pile, whilst the high degrees of mobilisation seen in some high Rayleigh number regimes can be explaining by resuspending particles. In experiments where particle piles have a positive density profile (dense particles …
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The behaviour of gas-emitting particles in fluidised beds
… experiments showed the two-phase theory of fluidisation holds exactly. To simulate spheres of devolatilising biomass, spheres of dry ice, sublimating in a hot fluidised bed were used, because dry ice emits a single, readily detectable gas. The spheres of dry ice were, however, much denser …
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Research in CO2 reduction by carbonation
… for, but it has not been commonly applied to fluidisation, except for simulating continuous phases in some Lagrangian studies. This thesis presents an investigation into the applicability of the model as a means of quantifying the behaviour of a fluidised bed and compares its performance to …
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The Utilization of Low-grade Carbohydrates
… was determined largely by a balance of the fluidisation and sedimentation forces acting on the colony morphology. In contrast, the concentration in the effluent stream depended on the growth conditions and was usually significantly lower. Experiments were carried out to determine the …
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Treatment of a multicomponent mining effluent using calcium hydroxide in a fluidized bed crystallizer
… of a large mass of precipitates which disrupted fluidisation and caused the reactor contents to be elutriated. These high concentrations resulted in high rates of accumulation which necessitated the need for frequent intermittent product removal.
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Solids mixing and segregation in a gas spout-fluid bed-effect of the distributor design
… fluidising phenomena can be exploited. In the fluidisation zone, better mixing is achieved by distributors which produce a large initial bubble diameter. Some common features exist between the behaviour of unidensity jetsam-rich systems and different density flotsam-rich systems. The shape …
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The flow of particulate bulk solids in an air-assisted gravity conveyor
… fluidising rig. Significant features of the fluidisation behaviour of the powders in "stationary" (as opposed to "flowing") beds were recorded, notably their minimum fluidising veIocities and bulk densities. The second part of the experiment programme involved the flow of an aerated p.v.c. …
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An experimental investigation of leakage flow paths in soil surrounding leaks in water distribution systems
… jets entering the surrounding soil causes a fluidisation zone outside leaks. The fluidised zone of soil and water is responsible for dissipating most of the energy of the water jet from the pipe leak and thus, limiting the leak's ability to reach soil surface. In municipalities where active …
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Effect of particle size on slugging fluidised beds
… way an indictment of the "two-phase theory" of fluidisation. In Chapter 5 the problems of pressure and bed height fluctuations in slugging beds are considered, and equations formulated to allow for the varying behaviour of slugs in beds of fine and coarse particles. The air velocities within …
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Investigation of Multiphase Reactor Hydrodynamics Using Magnetic Resonance Imaging
… flow data were compared to classical two-phase fluidisation theory, which revealed noteworthy differences in the division of flow between the particulate and bubbling regions.
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Development and characterisation of a copper-based oxygen carrier for chemical-looping with oxygen uncoupling (CLOU)
… fluidised bed but agglomeration and de-fluidisation was observed when the carrier was re-oxidised from the Cu form. For design, it is important to understand the thermodynamics and kinetics of the release of gaseous O$_{2}$ from the oxygen carrier, because the combustion of the solid …
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Factors affecting drug distribution in granules.
… granules. The effect in the granules dried by fluidisation was an abrasive action while that of the other drying methods was due to solute migration during drying. All the factors affecting drug distribution during the drying in the hot air oven were found to be connected with the degree of …
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Evaluation of granular media to wastewater treatment; advanced primary treatment utilising modified pumice, titanomagnetite and ceramic nozzles.
… feature of the TM medium was its ease of fluidisation at flowrates < 10 m/h. This characteristics make it a suitable medium for pulsed bed operation. A feature of the SS medium was its large hydraulic conductivity and high solids holding capacity. On the basis of the results obtained from …
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Chemical Looping Combustion: A Multi-Scale Analysis
Chemical looping combustion (CLC) is a technique for separating pure carbon dioxide from the combustion of fuels. The oxygen to burn the fuel comes from the lattice oxygen contained in solid particles of an inorganic oxide (the ‘oxygen carrier’), instead of from oxygen in the air. Thus only CO2 and …
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