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 117 for “"Flow behaviour"”.
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The flow behaviour of non-Newtonian sludges
A large body of data is analysed of the flow of concentrated sewage sludge through straight pipes. Mathematical models are obtained of the laminar and turbulent flow of each main category of sewage sludge. The sludges are modelled as time-independent, non-Newtonian relations between shear stress, …
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The flow behaviour of shallow fluidised beds
The flow behaviour of shallow gas-fluidised beds was studied. experimentally using a rotational viscometer, and an inclined open channel. Initially, tests were carried out with the viscometer in order to establish qualitative trends in the flow properties of a variety of materials over a wide range …
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In-line powder flow behaviour measured using electrostatic technology
Within solid-dose manufacturing processes, powder flow and powder triboelectrification are critical to the quality of the final product. Off-line testers do not simulate the shear and packing conditions that a powder would experience in-process and may be unreliable in predicting in-line flow and …
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The rheology and flow behaviour of high concentration mineral slurries
The rheology and flow behaviour of high concentration backfill tailings are investigated using a modified Balance Beam Tube Viscometer. The viscometer is capable of producing reliable data using a computer based data acquisition system and three different tube diameters. The aim of this research is …
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An experimental rig to investigate crosswind effects on intake flow behaviour
… which can lead to downstream distortion of the flow at the fan plane. Due to the complex nature of the ingested crosswind flow field, it has been found to be difficult to study in detail experimentally without incurring extreme costs. The work in this thesis presents a method of studying …
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Modelling the flow behaviour of gas bubbles in a bubble column
… challenges associated with solving multi phase flow problems arise from the complexity of the governing equations which have to be solved, which are typically mass, momentum and energy balances. These time-dependent problems need to include effects of turbulence and are computationally expensive …
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Determination of the air and crop flow behaviour in the blowing unit and spout of a pull-type forage harvester
… distance of a forage harvester by modeling the flow of forage in the spout and the air flow in the blower and spout. These models can then be used to compare the efficiencies of prototype designs. The air flow in the blower and spout was modeled using the commercial computational fluid dynamics …
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The development of a new compact model for prediction of forced flow behaviour in longitudinal fin heat sinks with tip bypass
… design, due to a lack of understanding of the flow physics, may lead to premature component failure. It is therefore crucial that an optimal heat sink design is achieved for every particular application. In the past, both heat sink design and optimisation have occurred mostly through …
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Development of a test protocol for industry to predict and optimise flow behaviour of blended powders utilising particle to bulk scale models
… measuring, controlling and/or modifying the bulk flow properties of powders. A recently developed powder flow tester (PFT) by The Wolfson Centre for Bulk Solids Handling Technology, University of Greenwich is now available for industry to measure quickly and accurately the flow behaviour of single …
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Rheology and Flow Behaviour of Non-Newtonian, Polymeric Fluids in Capillaric and Porous Media: Aspects Related to Polymer Flooding for Enchanced Recovery of Heavy Oil
… fundamental knowledge of the rheology and flow behavior of polymeric fluids that is essential in creating a detailed screening protocol. The evaluation of these critical parameters is based upon the following: 1) fundamental rheological measurements of non-Newtonian polymeric fluids; 2) …
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Characterization of fluid flow in paper-based microfluidic devices
… a mathematical model is required to predict flow behaviour in the paper-based microfluidic devices. A series of experiments were conducted to observe the parameters that influence fluid flow behaviour in paper during imbibition. The parameters investigated included temperature, humidity, …
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An Experimental Study on the Effects of Heat and Chemical Inhibitors on the Flow Behaviour of Waxy Crude Oils. The Effects of Heat and Chemical Inhibitors on the Rheological Properties of Waxy Crude Oils with regard to Pumping in Pipelines
… the crude and crude gel properties and flow conditions. The research problem was approached by characterizing the crude gel with and without additives using chromatography (GC), differential scanning calorimetry (DSC), cross polarised microscopy (CPM), controlled stress and oscillatory …
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The effect of phyllosilicate mineralogy and surface charge on the rheology of mineral slurries
… remains a poor understanding of their suspension flow behaviour. The primary objective of this thesis was to characterise the colloidal behaviour of three commonly occurring phyllosilicates, namely muscovite, vermiculite and chrysotile in terms of their surface charge, mineralogical and resultant …
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Computational fluid dynamic investigations of flow through an aged CANDU pressure tube
… with Hydra in this work. The predicted coolant flow behaviour of two cases were compared in order to investigate the impact of pressure tube deformation (sag and diametral expansion) on coolant flow. The boundary conditions and material properties are representative of normal operating …
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The rheology of silicon nanoparticle inks fro screen printing electronic devices
… electronics, it is important to understand the behaviour of the functional inks and more especially their rheology and surface properties. This project emphasises the importance of ink characterization by performing rheological tests on silicon nanoparticle based inks that are used in the screen …
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The characterisation of the hydrodynamic vortex separator using residence time distribution analysis.
… in the sewerage system as a combined sewer overflow (CSO) for the separation of solids from an incoming waste stream. This project presents the first stage in developing and aiding the existing design methodology for the optimisation of kinetic processes within the HDVS. The kinetic process …
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Investigation into the dispensing-based fabrication process for tissue scaffolds
… in terms of their biocompatibility and flow behaviour. The biocompatibility of biomaterials of PLLA, PCL, collagen, chitosan, and gelatine is evaluated in terms of supporting neuron cells’ adhesion and outgrowth. Chitosan solution (2% w/v) in acetic acid is shown to be the most promising …
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Functional properties of white maize meal stored under tropical conditions
… by the storage temperature than humidity. The flow behaviour of the white maize meal pastes were best described by Herschel-Bulkley and Mizrahi-Berk models. Herschel-Bulkley and Mizrahi-Berk models could be used to predict the flow behaviour for low temperature storage conditions during the …
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A novel method of producing microbubbles for targeted drug delivery.
… A numerical model is established to describe the flow behaviour and it is determined that the flow regime and resulting microbubble size are dependent on the ratio of inner- to outer Weber number.
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The identification and modelling of the dominant failure mode in hot forging tooling
… of the art approaches to modelling the plastic flow behaviour of tempered martensitic tool steels for the purpose of tool life prediction. A lifing model was developed to describe the plastic flow behaviour of tempered martensitic steel. A physical based model developed to describe the creep …
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