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Showing 1 to 20 of 20 for “"Sparger"”.
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Investigating the Effects of Sparger Design in Column Photobioreactors
… photobioreactors (PBRs) are changed based on the sparger types, spacings, and positions. Computational Fluid Dynamics (CFD) is used to predict fluid flow patterns, thermal profiles and additional hydrodynamic and heat transfer parameters in these photobioreactors. The gas bubbles and the …
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Void fraction measurements in large (0.3 m) diameter bubble column using Wire Mesh Sensor and Pressure transducers- Effect of sparger
… Homogenous and Heterogenous flows. Two different spargers (point sparger and four arm spargers) were used to study the effect of the sparger design on the hydrodynamics. The measurement uncertainty of the WMS and PTs for air-water two-phase flows is investigated by repeating the experiments. The …
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Development of a Novel Air Sparging Device
… air sparging technologies. High performance air spargers increase the probability of collision and attachment between air bubbles and particles, thereby improving recovery of fine and coarse mineral particles otherwise misplaced to the tailings fraction in conventional flotation cells. Although …
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Void fraction measurements in a large (0.3 m) diameter bubble column using Wire Mesh Sensors and Pressure Transducers: Effect of Spargers
… Homogenous and Heterogenous flows. Two different spargers (point sparger and four arm spargers) were used to study the effect of the sparger design on the hydrodynamics. The measurement uncertainty of the WMS and PTs for air-water two-phase flows is investigated by repeating the experiments. The …
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Design of the aerobic hail reactor - towards improved energy efficiency
… studies were carried out on the impact of sparger depth and angle on circulation time. Using the laboratory-scale system a range of sparger designs, including different angled jets, outlet areas and a circular sparger design, were investigated. The circular sparger design was found to be …
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Heat and mass transfer in bubble column dehumidifiers for HDH desalination
… height, and horizontal position relative to the sparger orifices are varied. The highest heat transfer coefficients are recorded on cylinders placed in the coalescing region and directly above the sparger orifices. Heat flux and parallel-flow effectiveness of a bubble column dehumidifier are …
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Effect of Ozone and Ultraviolet Irradiation Treatments on Listeria monocytogenes Populations in Chill Brines
… inch PVC tubing for the ozonation of brines. The sparger was designed to facilitate better diffusion and its efficiency was tested. The modified sparger diffused 1.44 ppm of ozone after 30 minutes of ozonation and the solution had an excess of 1 ppm in 10 minutes of ozonating fresh brine solution …
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Dissolved air (pressure) flotation
… feed by continously recycling the air through a sparger, i.e. there is no air wastage. The air circulating pump operates within the pressurized circuit so that it pumps only against the hydrostatic head of water in the saturator. A vertical flow type flotation unit was developed which provides a …
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Optimization of Air-injection Spargers for Column Flotation Applications
… is required. In column flotation operations, Sparger sparging devices are employed in column flotation operations to generate small bubbles into the cell with the aim to carry the the desired mineral to the surface for later be recovered and proceeded. However, field studies suggest that air …
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Investigation of Flash Flotation Technology Utilizing Centrifugal Forces and Novel Sparging Methods
… the ASH technology ultimately suffers from sparger plugging problems. Therefore, three unique flotation cyclone designs were developed utilizing external sparging systems and control features to float fine coal. The objective of each design was to create a system that mimics the behavior of …
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Development of dielectric spectroscopic monitoring methods for the prediction of viable cell density and volume in mammalian cell culture
… the biomass probe to vessel walls, pO2 probe and sparger with the bubbles from aeration having a significant effect on the signal. The three prediction models were a high cell density suspension serially diluted to a low cell density, real time culture suspension data and combination of the high …
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Microchemical systems for singlet oxygen generation
… an order of magnitude improvement over sparger and rotary SOG designs. A detailed physical model is developed to understand the behavior of the microSOG. This model is used along with the experimental results to gain insights into the poorly characterized singlet oxygen deactivation …
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Fermentation of organic waste for bioplastic production : A potential sustainable alternative to fossil-fuel plastic
… marine and Rushton with baffles; - two aerations spargers; circular and micro. The results revealed that; the pO2 needs to be higher to 20% and it may be linked with the reduction of stress induced to the cells; the marine blades increased the OD and reduced the medium viscosity; the impact of the …
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Fermentation of organic waste for bioplastic production. A potential sustainable alternative to fossil-fuel plastic
… marine and Rushton with baffles; - two aerations spargers; circular and micro. The results revealed that; the pO2 needs to be higher to 20% and it may be linked with the reduction of stress induced to the cells; the marine blades increased the OD and reduced the medium viscosity; the impact of the …
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General Counsel Characteristics and Financial Reporting Quality
<p>The general counsel (GC) plays a key role in a firm’s financial reporting system as a participant and governance monitor. As a participant in various disclosure and filing processes and advisor in transactional activities reflected in the firm’s reported results, the GC directly influences a …
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A productivity study on Smith Mountain Lake
The rapid deterioration of the water quality in the upper end of the Roanoke River arm of Smith Mountain Lake has caused much concern. Eutrophic conditions have been established in this portion of the lake since 1965, when it was first brought to operating level. A multiphase productivity study was …
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Is the Share of Agricultural Maintenance Research Rising? Implications for Future Productivity Growth in U.S. Agriculture
Agricultural research is susceptible to research deterioration due to biological, climatic, and economic forces. Research deteriorates as the base conditions it addresses change which leaves the resulting information or technology less effective, efficient, productive, and/or relevant. Maintenance …
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Heterogeneous oxidation of alcohols
… a Rushton Turbine at 20 rps with a shower disc sparger and a treated catalyst allowed the selectivity to reach 93%. The reaction could be described with a Power Law model satisfactorily. Transition Metal Oxide catalysts such as \(AgO/ SiO_2, Fe_2O_3/SiO_2, CuO/SiO_2\) and \(CuO/Al_2O_3\) were …
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Bubble Size Effects in Coal Flotation and Phosphate Reverse Flotation using a Pico-nano Bubble Generator
… than column flotation with conventional sparger devices. The economic analysis performed in this study demonstrated that the application of pico-nano bubbles in both phosphate reverse flotation and coal flotation were economically feasible.
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An Investigation Of Implementations Of Smaller Learning Communities In Florida High Schools
<p>The issue of high school reform has received national attention during the first part of the 21st century. One idea brought forth in this restructuring effort has been the desire to create high schools with smaller student populations. However, in an era of tight budgets, where resources are not …