Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 23 for “"Gas dispersion"”.
-
Hydrodynamics and gas dispersion in industrial flotation cells
Solids suspension and gas dispersion studies were performed on a total of 40 industrial flotation cells of various types, sizes and duties in a Platinum Group Metal (pgm) concentrator in the North West Province of South Africa. The wide variety of cells studied included a Bateman 3-m³ cell, …
-
Numerical modelling of hydrodynamics, gas dispersion and mass transfer in an autoclave
Includes abstract. Includes bibliographical references.
-
Rheological effects on gas dispersion in a pilot scale mechanical flotation cell
… in mechanical flotation cells, where effective gas dispersion is a primary requirement for particle-bubble contacting. Due to the mineralogical complexity of ores, it is required that particles be ground even finer to liberate valuable minerals. Mining operations tend to run flotation circuits …
-
An Investigation of the Gas Dispersion Properties of Mechanical Flotation Cells: an In-Situ Approach
… industrial-scale experimental investigation of gas dispersion performance of two commercially available flotation cells. To facilitate this investigation, a continuous pilot-scale flotation system was developed and tested. The results of the hydrodynamic and metallurgical testing conducted on …
-
Sensitivity of methanol-to-olefin reaction to axial gas dispersion: determination in a vibrated-bed microreactor
… of Methanol-To-Olefin (MTO) reaction to axial gas dispersion. It comprises a rectangular horizontal duct, 12.7 mm in height, 25.4 mm in width, variable in length, charged with a 1-mm-deep layer of HZSM-5 catalyst. The microreactor is constructed of aluminum alloy and heated with cartridge …
-
Role of connate water salinity in gas dispersion during enhanced gas recovery by carbon dioxide injection and sequestration
… influence mixing between CO2 and CH4 in naturalgas reservoirs can provide an avenue to minimise the gas dispersion during Enhanced GasRecovery (EGR). This highlights EGR’s field scale adoption as a potential method forsimultaneously reducing CO2 emissions through sequestration and enhancing …
-
Cold model of a vibrated-bed microreactor capable of varying Peclet number at fixed weight hourly space velocity providing a tool for simulating an important feature of the reaction kinetic scene in large catalytic fluid beds
… tested with capability for varying the level of gas dispersion (characterized by axial Peclet number) at a fixed weight hourly space velocity (WHSV). A tool has thus been provided whereby an important feature (viz., gas dispersion) of the reaction kinetic scene in large catalytic fluid beds can …
-
The evaluation of solids suspension in a pilot scale mechanical flotation cell
… collection, with solids suspension together with gas dispersion and reagent mixing as necessary preconditions for particle collection. Solids suspension is therefore often identified as an important subprocess for effective flotation. Yet, surprisingly little work has been published on solids …
-
Laboratory-Scale Analysis of Energy-Efficient Froth Flotation Rotor Design
… performance in four criteria: power consumption, gas dispersion, operational robustness, and flotation kinetics. Evaluation of the various rotors was conducted in two campaigns: (1) an exploratory campaign which featured 14 rotors in limited operational conditions (2) a detailed campaign which …
-
Experimental study of natural convection heat transfer and gaseous dynamics from dual-channel circulation loop
… such as plenum-to-plenum heat transfer and gaseous dynamics during natural circulation. Natural circulation of the coolant is the leading capability for VHTR to transport the decay heat from the core to the reactor vessel during accident scenarios. To address this need, a scaled-down …
-
Positron emission particle tracking applied to solid-liquid mixing in mechanically agitated vessels
… used for liquid blending, solid-liquid mixing, gas dispersion in liquids, heat/mass transfer enhancement and chemical reaction. Mixing is intrinsically a Lagrangian process and, whilst Eulerian data are essential, Lagrangian information is necessary for its complete description. Possible …
-
Investigating the use of sodium metasilicate to improve the flotation performance of altered PGE ores
… the viscosity of the slurry leading to poor gas dispersion and (iii) decrease the concentrate grade due to naturally-floating gangue. Sodium metasilicate was investigated because its dispersant, rheology modifying, and depressant properties could prove promising in combating the problems …
-
Inverse techniques: problems in optics and gas sensing
… classes of problems are discussed: locating gas sources from downwind gas concentration measurements and designing diffractive optics (i.e. computer generated holograms), which on illumination will produce a desired light beam in the far field. The similarity between these problems is that …
-
Multiphase CFD modelling of stirred tanks
… However, due to the various processes involving gas-liquid systems, the need for multiphase modelling of stirred tanks became increasingly important. This has led to more research studies involving multiphase flows. Most of the work reported showed good prediction of the velocity data and the …
-
Optimization of Air-injection Spargers for Column Flotation Applications
… achieve this end, With this in mind, data of for gas-water injection rate, froth addition, and inlet-pressure have been collected and analyzed. The This data not only will facilitate an insight of to better operational practices that plant operators can employ to improve column performance, but it …
-
Risk and safety assessment of an alkaline electrolyser system for green hydrogen production
… of hydrogen specific failure rate data. Gas dispersion modelling was performed using ALOHA software for two locations, i.e., near Moorreesburg and the port of Saldanha. Results showed that hydrogen release from a 250 m3 storage presents the highest risk compared to release from a 200 m …
-
Determination of a novel mine tracer gas and development of a methodology for sampling and analysis of multiple mine tracer gases for characterization of ventilation systems
… personnel into the mine. By utilizing tracer gas techniques, which are powerful techniques for monitoring ventilation systems, especially in remote or inaccessible areas, analysis of the ventilation system immediately following a mine emergency can be more rapidly ascertained. However, the …
-
Mixing in high throughput experimentation reactors
… both turbulent and laminar mixing regimes. For gas-liquid mixing using air and water (P\(_G\)/V = 168 Wm\(^{-3}\), Q\(_G\) = 0.5–1.0 vvm), an image analysis algorithm was developed which enabled measurement of gas and liquid phase velocities separately. In addition to the PBT, a Rushton Disk …
Page 1 of 2