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 66 for “"population balance"”.
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Detailed population balance modelling of industrial titania synthesis
… thesis presents an efficient and robust detailed population balance framework for simulating aerosol synthesis of structured particles using a stochastic method. This is developed in the context of the industrial titania (TiO2) process to enable extensive numerical characterisation of the …
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Detailed Population Balance Modelling of Titanium Dioxide Nanoparticle Synthesis
This thesis develops and applies a new detailed population balance model to study the aerosol synthesis of titanium dioxide nanoparticles. It begins by exploring whether the morphological data captured by an existing detailed particle model can be used in a milling model to relate particle …
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Finite element and population balance models for food-freezing processes
… process. This is achieved through the use of population balance equations (PBE). Crystal size and corresponding hardened ice cream coarseness can be predicted through the PBE model presented in this thesis. The crystallization results are validated through previous experimental study. After …
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Computational Fluid Dynamics and Population Balance Modeling of Particulate Systems
… The models focus on the combination of population balance equations and computational fluid dynamics software. For the simulation of antisolvent crystallization, knowledge of kinetics at high supersaturation are necessary. Chapter 2 describes the concentration profile within a …
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Multidimensional population balance modeling and optimization of continuous reactive crystallization
… rate. This thesis presents a multidimensional population balance model (PBM) framework that models CSD with two independent characteristic lengths or 2D PBM. Compare with the 1D PBM, the extra characteristic length in the 2D PBM provides enough degrees of freedom to model needle-, plate-, and …
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New experimental approaches to the population balance equation:Eulerian and Lagrangian viewpoints
Cell-to-cell variability in an asynchronous population of cells can be generally related to genetic differences, to different positions in the cell cycle, to the exposure of a heterogeneous environment, or to stochastic variations due to the low number of molecules in individual cells. To …
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A detailed, stochastic population balance model for twin-screw wet granulation
… the construction of a detailed, compartmental population balance model for twin-screw granulation using the stochastic weighted particle method. A number of new particle mechanisms are introduced and existing mechanisms augmented including immersion nucleation, coagulation, breakage, …
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Numerical solution of multicomponent population balance systems with applications to particulate processes
Population balances describe a wide variety of processes in the chemical industry and environment ranging from crystallization to atmospheric aerosols, yet the dynamics of these processes are poorly understood. A number of different mechanisms, including growth, nucleation, coagulation, and …
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Numerical simulation of bubble columns by integration of bubble cell model into the population balance framework
… of this study is to integrate the BCM into the Population Balance Model (PBM) framework and thus predict overall mass transfer rate, overall intrinsic heat transfer coefficient, bubble size distribution and overall gas hold-up. The experimental determination of heat transfer coefficient is …
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Hybridization of electrical resistance tomography to population balance model for accurate bubble column reactor hydrodynamic parameter predictions
… and the Gas Disengagement Technique using a Population Balance as a framework. As a result, detailed hydrodynamic predictions suitable for Bubble Column Reactor [BER] optimisation results with minimal computing effort. Electrical Resistance Tomography [ERT] is a technique for creating 3D …
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Stochastic modelling of silicon nanoparticle synthesis
… simulate the formation of silicon nanoparticles. Population balance modelling is used to model nanoparticle synthesis and a stochastic numerical method is used to solve the governing equations. The population balance models are coupled to chemical kinetic models and offer insight into the …
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Mathematical modeling, simulation, and optimal design of pharmaceutical crystallizers
… a partial differential equation known as the population balance equation. This thesis constructs population balance models for three distinct particulate processes: 1) the breakage of crystals due to ultrasonication, 2) a semi-batch anti-solvent crystallization, and 3) continuous slug-flow …
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Modeling and Control of Batch Pulsed Top-spray Fluidized bed Granulation
… was carried out including experimental study, population balance model (PBM), computational fluid dynamic (CFD) study and control strategy development. For the experimental study, the influence variables of pulsed frequency, binder spray rate and atomization pressure of a batch top-spray …
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Multiscale Modeling and Mechanistic Analysis of Crystallization and Particulate Processes
… dynamics simulations, microkinetic modeling, and population balance modeling are used to investigate crystallization phenomena across molecular, mesoscale, and continuum scales. We observed that antisolvent crystallization and oiling-out are governed by disruption of hydration shells and solvent …
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Experiments and modeling of size reduction of switchgrass in laboratory rotary knife mill
… The objective of this study was to apply the population balance method for modeling the size reduction process. The model was applied to switchgrass size reduction by a grinder. Two population balance parameters, grinding rate (s⁻¹) and breakage distribution function (dimensionless) were …
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Improving Efficiencies in Water-Based Separators Using Mathematical Analysis Tools
… analysis tools. Linear circuit analysis and population balance modeling were utilized to remedy inefficiencies found in a number of popular mineral processing water-based unit operations. Improvements were made in areas, including unit capacity and separation efficiency. One …
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Modeling the sustained release of PLGA-based drug delivery systems with a physically-based model and pore space characterization
… captured with the use of a properly formulated population balance model. Good agreement between model predictions and experimental physical moments of the pore space network was found and further demonstrated with the reconstructed number distributions of the individual pore volume, highlighting …
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MULTI-SCALE MODELING OF HIGH-SHEAR GRANULATION
… flow within the granulator and a macro-scale population balance to describe the whole system.
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Multiphase particle-size-grouping model of precipitation and its application to thermal processing of microalloyed steel
… model.Next, a kinetic growth model based on population balance and Particle-Size-Grouping (PSG) method gives the volume fraction and size distribution of precipitates evolving with time. The method features geometrically-based thresholds between each size group, reasonable estimates of border …
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