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.
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Showing 1 to 20 of 44 for “"Residence Time Distribution"”.
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A Novel Approach To Residence Time Distribution
… in a fluidized bed riser to determine the Residence Time Distribution (RTD) of solids flow within a fluidized bed riser. The instrument was implemented in a dual-stage transparent scale model fluidized bed riser. Testing of the instrument system validated the functionality of the …
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The characterisation of the hydrodynamic vortex separator using residence time distribution analysis.
… kinetic processes efficiency. This project used residence time distribution (RTD) analysis to extensively characterise the mixing regime within a model and prototype HDVS. The HDVS was operated with and without a baseflow component and with and without the sludge hopper for a range of inlet flow …
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Redesign of Industrial Column Flotation Circuits Based on a Simple Residence Time Distribution Model
The potential for improved selectivity has made column flotation cells a popular choice for upgrading fine coal. Unfortunately, recent production data from full-scale column plants indicate that many industrial installations have failed to meet original expectations in terms of clean coal recovery. …
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Continuous blending of dry pharmaceutical powders
… powders coupled with long quality analysis times increases the production cycle time leading to strained cash flows. Also, scale-up issues faced in process development causes delays in transforming a drug in research to a drug under commercial production. Continuous blending is as an …
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Immobilisation of copper, chromium and arsenic on stabilised domestic refuse
… of adsorption isotherms. At pilot-scale, the residence time distribution/deviation from ideal behaviour of the pilot-scale landfill columns was determined. Subsequently, the kinetic rate constants and the results from the residence time distribution studies were evaluated at pilot-scale. The …
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Characterization of a novel laboratory internal recycle reactor for HTFT studies
… Internal Recycle Reactor (STIRR) by means of a residence time distribution (RTD) study to determine its suitability for catalyst testing for High Temperature Fischer-Tropsch studies. It is required to not only ensure that the reactor behaves as a perfectly mixed CSTR, and but also to confirm …
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A bubble-particle interaction model for flotation combining hydrodynamic and surface forces
… by (i) the flotation rate constant and (ii) the residence time distribution of the particles. In the present work, theoretical and experimental analyses have been carried out to develop methods for predicting these parameters from first principles considerations. In order to predict the flotation …
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Drying of portland cement raw material slurries:predicting the performance of a counter-current spray drier
… Drop Experiments, and (2) Spray Drying and Residence Time Distribution Experiments. The thermal conductivity of slurry cakes from five different sources have been experimentally determined using a modified Lee's Disc Apparatus and the data collected was correlated by the polynominal... Good …
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Mixing in granular systems and applied coating technology
… to obtain high production volumes. The mixing time is difficult to predict in a continuous process, whereas in a batch system it is easily controlled. The particle flow behavior must be characterized, as the amount of time a given particle spends in the coating zone will affect its coating …
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The characterisation of a two stage flotation circuit treating a complex platinum and chromite ore
… and each unit was evaluated over a period of time. The performance of each unit in terms of platinum, palladium, rhodium and chromite recoveries was determined by sampling around the unit. The changes in ore floatability characteristics were monitored by carrying out batch flotation tests on …
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Study of the C-curve fluctuation analysis for a CSTR reactor
… Tank Reactor) was set up to perform the RTD (Residence Time Distribution) test. A electrical conductivity probe capable of measuring concentration variations in volume elements of the order of 3.00 x 10⁻⁵ml was used to detect the tracer {sodium chloride) response. Flow rates ranging from 52 …
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Kinetics of the electrocoagulation of oil and grease
… configurations were evaluated by comparing the residence time distribution (RTD) data generated in each case. These data produced indication of internal recirculation and stagnant water when the fluid followed a vertical path. These anomalies were attenuated when the fluid flowed horizontally …
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A Mathematical Model for the Devolatilization of EPDM Rubber in a Series of Steam Stripping Vessels
… first, and a process model that accounts for the residence-time distribution of crumb particles was developed second. Plant data as well as input data from an existing steady-state model was used to determine estimates for the tuning parameters used in the multiple-particle, multiple-tank model. …
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Liquid side flow characteristics in a packed absorption column
… the evaluation of the moments of the resulting residence time distribution curves. It has in the past been found that this method often produces misleading results due to the magnification of experimental errors. An improved method of moment analysis is introduced in this work in an attempt to …
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Characterization and application of vortex flow adsorption for simplification of biochemical product downstream processing
… through two experimental approaches, tracer residence time distribution (RTD) study and breakthrough capacity measurements, and two modeling approaches, a one-dimensional dispersion convective model and a two-region vortex flow model. It was concluded that the axial dispersion in the vortex …
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Model studies of plasma heating in the continuous casting tundish.
… model determined from the results obtained from residence time distribution measurements. A conductivity method was used, a highly conducting species being injected at the inlet point and changes in conductivity monitored at the exit. Measurements were also made of the changes in temperature at …
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Predispersed solvent extraction of copper from dilute aqueous solution
… Since the aphrons are so small, it takes a long time for the solvent to rise to the surface under the influence of gravity alone. Therefore, the separation is expedited by piggy-back flotation of the aphrons on especially prepared gas bubbles, which are somewhat larger than aphrons and are called …
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Experimental study of natural convection heat transfer and gaseous dynamics from dual-channel circulation loop
… tracer technique to accurately measure the residence time distribution (RTD) in an of flow systems by injecting pulse change gas tracer and then monitoring its concentration at the exit. The measured RTD is utilized to quantify the gas dispersion and identify the degree of mixing in the …
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