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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 27 for “"positron emission particle tracking"”.
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Development of 18F radiochemistry for positron emission particle tracking (PEPT)
Positron emission particle tracking (PEPT) is a non-invasive tracer-based measurement technique used to obtain dynamic information about multiphase systems. The basis of the technique is to radiolabel a phase-representative tracer particle with a positron emitting radionuclide. Electron-positron …
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Observing flow using fast neutron radiography and positron emission particle tracking
… studied using fast neutron radiography (FNR) and positron emission particle tracking (PEPT). A new fast neutron imaging system was commissioned at The South African Nuclear Energy Corporation, Pretoria, as part of this study, although FNR measurements were ultimately performed at …
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Sub-Millimetre Positron-Emission Particle Tracking Using a CdZnTe Semiconductor Array
The Positron Emission Particle Tracking (PEPT) technique has been in development in Cape Town since 2009, and typically allows the tracking of a 1 mm diameter positron-emitting source travelling at 1 m/s with precision around 1 mm at kHz rates. Conventionally, PEPT utilises large, high efficiency …
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Granular flow modelling of rotating drum flows using positron emission particle tracking
… capability beyond their window of design. Using Positron Emission Particle Tracking (PEPT) data we recover the key ingredients (velocity, shear rate, volume concentration, bed depth) for developing, testing and calibrating granular flow models. In this regard, 5 mm and 8 mm glass beads are …
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Positron emission particle tracking applied to solid-liquid mixing in mechanically agitated vessels
… or experimental techniques based on Lagrangian tracking to provide the trajectories of fluid elements or solid particles. In this work a set of tools are developed for the analysis and theoretical validation of Lagrangian single and multi-phase flow data obtained from tracer trajectories in …
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Circulation rate modelling of tumbling mill charge using positron emission particle tracking (PEPT)
… being made by many mill models that a particle imparts energy for potential breakage only once per revolution of the mill to the charge body – that is, that the circulation rate of mill charge can be assumed to be constant irrespective of the speed at which the mill is run. The …
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The application of positron emission particle tracking to study non-metallic inclusions in metal castings
… either at the surface or at a large Hf rich particle subsurface. Oxidation was found to have a large effect on both initiation and growth of fatigue cracks. By introducing a sharp pre-fatigue crack into samples, static load testing was used to determine a threshold value of K (stress …
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Improving the selectivity of the radio-labelling of ion exchange resin tracers for positron emission particle tracking
Positron emission particle tracking (PEPT) is a technique which non-invasively tracks tracer particles labelled with a positron emitting radionuclide in a system of flow. The tracers are tracked through the detection in a PET scanner, of the two nearly collinear 511 keV gamma rays resulting from …
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Using positron emission particle tracking (PEPT) to investigate the motion of granular media in a laboratory-scale tumbling mill
Positron emission particle tracking is a Lagrangian, single particle tracking technique in which the trajectory of a representative tracer particle is triangulated from the decay products of the positron-emitting radioisotope with which it is labelled. Although the trajectories of a tracer particle …
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Tracing particle movement for simulation of light history and algal growth in airlift photobioreactors using Positron Emission Particle Tracking (PEPT)
This Thesis is embargoed. Only the Abstract is available
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Lagrangian studies of turbulent mixing in a vessel agitated by a rushron turbine: positron emission particle tracking (PEPT) and computational fluid dynamics (CFD)
… the detection of a tracer that emits gamma rays. Positron Emission Particle Tracking (PEPT) has been developed at the University of Birmingham and has been used in a wide range of applications including stirred tanks. However, for agitated vessels, any attempt of validation of the PEPT technique …
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Investigations into a positron emission imaging algorithm
A positron emission imaging algorithm which makes use of the entire set of lines-of-response in list-mode form is presented. The algorithm parameterises the lines-of-response by a Cartesian mesh over the field-of-view of a Positron Emission Tomography (PET) scanner to find their density …
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Analysis of energy requirements in stirred media mills
… analysis of flow patterns within the mill using Positron Emission Particle Tracking (PEPT). Data collected from PEPT has given new insights into the distribution of material and kinetic energy within the mill, as well as an understanding of the effect of media density and motor speed in relation …
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The development of positron imaging systems for applications in industrial process tomography
The diagnostic medical imaging technique of Positron Emission Tomography (PET) has been adapted at the University of Birmingham for use in imaging industrial processes. A particularly powerful technique, called Positron Emission Particle Tracking (PEPT) is used to study granular materials and fluid …
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New technique for radiolabelling tracer with 64CU for positron emission particles tracking (PEPT) experiments
Positron emission particle tracking (PEPT) is a non-invasive technique for studying the flow of particulate systems within industrial equipment. The technique tracks a tracer particle labelled with a positron emitting radionuclide moving within the field-of-view of a positron emission tomography …
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Experimental and computational study of non-turbulent flow regimes and cavern formation of non-Newtonian fluids in a stirred tank
… thinning Herschel-Bulkley fluid is very slow. Positron emission particle tracking obtained flow patterns and cavern sizes of three rheologically complex opaque fluids. CFD was able to predict the data obtained from both experimental techniques fairly well at low Reynolds numbers. A toroidal …
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Probability based models for the power draw and energy spectra of a tumbling mill
Positron Emission Particle Tracking (PEPT) and the Discrete Element Method (DEM) are used to develop probability based models for the power draw and collision energy spectra of a tumbling mill. Experiments are conducted using dry spherical glass bead charge in a laboratory scale tumbling mill, …
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Evaluating the influence of lifter face angle on the trajectory of particles in a tumbling mill using PEPT
… for a laboratory scale mill. The study involved tracking a single particle representing the ensemble using the Positron Emission Particle Tracking (PEPT) to obtain the location of the particle with time. The particle was radiated with a radionuclide; ⁶⁸8Ga, which has a half-life of 68 minutes. …
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Axial segregation of granular flows in rotating drums
… verified by the nuclear imaging technique of Positron Emission Particle Tracking. (2) The geometric slope corresponding to the gravity-driven axial flux between adjacent bands is (binomially) expanded to second order thereby ensuring band coarsening in the long-time limit for all boundary …
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A granular flow model of an annular shear cell
… an IsaMillTM used in communition to produce fine particle sizes that allow minerals to be extracted are best modelled using granular flows. A single rheological description that captures all the features of granular flows has not yet been realised, although considerable progress towards a complete …
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