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 28 for “"population balance model"”.
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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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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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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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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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Modeling the sustained release of PLGA-based drug delivery systems with a physically-based model and pore space characterization
… an improved mechanistic sustained release model by incorporating a description of hydrolytic polymer degradation kinetics, which is validated against an extensive data set of drug release, water uptake, and polymer degradation from an in vitro study of a drug-surrogate-embedded PLGA system. …
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Precipitation, Aggregation, and Settling of Asphaltenes from n-Alkane Diluted Bitumens
… of asphaltenes from solvent diluted bitumen. Models and data that include the effect of solvent type, concentration, shear, and contact time on asphaltene precipitation and settling are required to design and optimize these processes but are lacking or are specific for conventional oils. In …
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Hydrodynamic studies and mathematical modeling of fine coal flotation
… the theoretically determined rate constant, a population balance model has been developed for the flotation of fine coal in a column. The model is capable of predicting the dynamic response of the flotation column to changes in a wide range of operational conditions. Model simulations have been …
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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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Numerical Investigations of Bubble Column Equipped with Vertical Internals in Different Arrangements
… work, an Eulerian-Eulerian based two-fluid model (TFM) coupled with a population balance model (PBM) is used to simulate the gas-liquid two-phase flows in bubble columns. The models studied were validated using experimental data from the literature. The selected model was used to simulate …
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Development of the selective-shear coagulation process for ultrafine coal cleaning
… was designed and characterized. A steady-state population balance model of the elutriation column was developed. The predictions were found to be in good agreement with experimental results.
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The effects of low aspect ratio and heat exchanging internals on the bubble properties and flow regime in a pilot-plant bubble/slurry bubble column for Fischer-Tropsch synthesis
… Eulerian-Eulerian approach incorporated with the population balance model PBM, exhibit the capability to simulate the bubble column in bubbly and turbulent flow regimes. However, results revealed that the presence of internals enhanced the gas holdup significantly in the wall region of the column. …
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Mean reaction rate closures for nanoparticle formation in turbulent reacting flow
… for turbulent reacting flow. The closures model the mean rate of reaction in the flow and are applied to simulations of nanoparticle formation. The simulations couple detailed chemical reaction, particle population dynamics and turbulent flow, and offer the potential to improve the …
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Stochastic modelling of silicon nanoparticle synthesis
… aerosol synthesis of nano-particles and a new model to 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 …
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A study of hydrophobic interaction in fine particle coagulation
… the hydrophobicity of the particles involved. A population balance model for a system of isotropic turbulent flow has been developed. Both aggregate growth and breakage have been considered in the model and their rate constants have been derived from a phenomenological approach. Numerical …
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Development of a computationally efficient model for the control of Ziegler-Natta catalysed industrial production of high density polyethylene
… off-specification product result. Implementing a model-predictive controller based on a dynamic reactor model may allow for minimising losses during unsteady-state operation. Such a model must be developed from a fundamental understanding of polymerisation reaction kinetics and the interaction of …
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Multidimensional population balance modeling and optimization of continuous reactive crystallization
… optimize the process, a first-principle process model is developed for the reactor-crystallizer to predict CSD and shape, and subsequently the filtration rate. This thesis presents a multidimensional population balance model (PBM) framework that models CSD with two independent characteristic …
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Ambit of Multiphase CFD in Modelling Transport Processes Related to Oil Spill Scenario and Microfluidics
… CFD in developing an integrated numerical model which accounts for various transport processes and hence would effectively guide us in predicting the fate of oil mass. In the initial stages, studies were conducted to understand these transport processes at a very fundamental level where the …
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Mathematical modelling and optimisation of the formulation and manufacture of aggregate food products
In this PhD study, mathematical modelling and optimisation of granola production has been carried out. Granola is an aggregated food product used in breakfast cereals and cereal bars. It is a baked crispy food product typically incorporating oats, other cereals and nuts bound together with a …
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A combined size reduction and liberation model of grinding
The grinding models developed previously are concerned with size reduction only. Although they have proven to be useful in the simulation and design of grinding mills, they do not provide information on liberation which is the main objective of most comminution operations. In the present …
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Modeling the Nucleation and Growth of Colloidal Nanoparticles
… and growth mechanisms and developing theoretical/modeling framework will pave the way towards controlled synthesis of colloidal nanoparticles with desired sizes and polydispersity. This dissertation focuses on identifying the possible roles of ligands and size on the kinetics of nanoparticle …
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