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Showing 1 to 15 of 15 for “"Residence Time Distribution (RTD)"”.
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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 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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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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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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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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Experimental and modeling studies using packed bed reactors: Liquid phase ethylene production by hydrogenation of acetylene
… which leads to catalyst deactivation and sometimes reactor runaway risks due to high exothermicity. To overcome these issues as well as to increase the selectivity and conversion, liquid-phase hydrogenation of acetylene was investigated in packed bed reactors (PBR) using a commercial catalyst. …
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Modelling of the mixing characteristics and flotation kinetics of the collection zone in flotation columns
… are evaluated using data obtained from three residence time distribution (RTD) studies performed on two pilot columns (5.4cm and 5.8cm diameter) and an industrial column (120cm diameter). Sodium chloride liquid tracers as well as radioactively labelled solid and liquid tracers were used in the …
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Comparison of Dairy Manure Anaerobic Digestion Performance in Gas-lift and Bubble Column Digesters
… flow of the two digesters, which is indicated by residence time distribution (RTD), showed a similar pattern. Furhter investigation of local liquid flow behavior using Computational Fluid Dynamic (CFD) indicate that the bubble column accumulated higher portion of sludge in the bottom of the …
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Computational fluid dynamics modelling of dissolved oxygen in oxidation ditches.
… to knowledge are the effect of bubble size distribution (BSD) and biochemical oxygen demand (BOD) distribution on the DO distribution. Species transport modelling predicts the BOD and DO distribution in the ditch. De-oxygenation of local dissolved oxygen by BOD is modelled by an oxygen sink …
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Flow and mixing studies in a co-rotating intermeshing twin screw extruder
… have been characterised by determination of residence time distribution (RTD) and of the paths taken by tracers added to the melt. The axial mixing and the effects of varius parameters on it were established by studying RTD using tracer techniques. As the tail of the distribution is of …
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Untersuchung des reaktionstechnischen Verhaltens in Behälterglaswannen mit Tracerversuchen
… of the glass melt. Chapter 3 will introduce residence time and residence time distribution as input and output descriptions with their statistical evaluation options. Furthermore, this theoretical part section will describe idealised fluidic models whose serial and parallel interaction give …
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Using positron emission particle tracking (PEPT) to investigate the motion of granular media in a laboratory-scale tumbling mill
… density to each voxel based on the number of times that triangulated tracer particle locations fall into it- a process called simple binning. A major outcome of my work has been to develop an alternative probability density based on the cumulative time spent by the tracer particle in a given …
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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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Residence time investigation of artificial silver ores in heap leaching using cyanide lixiviant
… and tank leaching. However, it is at the same time characterized by extended leaching periods due to slow mineral conversion and low rates of recovery as a major challenge. Interactions within the heap bed are not fully understood as chemical leaching and hydrodynamics interact in a complex …
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Comparison of non-reactive solute transport models for the evaluation of fluid flow in leaching beds
… of the heap characterized by variations in the residence times of fluid elements. Such variations produce fast flowing, slow flowing and stagnant solution pools. Therefore, ideal solution flow behaviour in a heap result in uniform wetting at the bed scale and plug flow behaviour with similar …