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Dissertations / Theses on the topic 'Floc properties'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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1

Kim, Jinho. "Floc properties in stirred suspensions." Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268458.

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2

Selomulya, Cordelia Chemical Engineering &amp Industrial Chemistry UNSW. "The Effect of Shear on Flocculation and Floc Size/Structure." Awarded by:University of New South Wales. Chemical Engineering and Industrial Chemistry, 2002. http://handle.unsw.edu.au/1959.4/18226.

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The effect of shear on the evolution of floc properties was investigated to analyse the flocculation mechanisms. Little fundamental attention has been given to the shear influence that often creates compact aggregates, while the floc characteristics might differ in other aggregating conditions. It is thus crucial to understand how flocs evolve to steady state, if their properties are to be 'tailored' to suit subsequent solids-liquid separation processes. In this work, flocculation of monodisperse latex particles of various sizes (60, 380, and 810 nm diameter) via electrolyte addition was carri

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3

Balls, Margaret. "Relationships between floc properties and NOM removal using a moorland water source." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1417138/.

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Natural organic matter, or NOM presents a treatment challenge to the conventional water treatment process and has been associated with the formation of disinfection by-products (DBP’s) such as Tri-halomethanes (THM’s) if not removed prior to the disinfection stage. Poor removal of NOM is also thought to lead to filter performance problems such as turbidity or particle count breakthrough, which represents an increased risk of passage of Cryptosporidium into the treated water. Understanding the complex nature of NOM floc and how its physico-chemical properties relate to the coagulation matrix wi

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4

Lee, Boon Chong. "The influence of nutrients on floc physicochemical properties and structure in activated sludge processes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ28822.pdf.

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5

Kolda, Bridget C. "Impact of polymer type, dosage, and mixing regime and sludge type on sludge floc properties." Thesis, Virginia Tech, 1995. http://hdl.handle.net/10919/40662.

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<p>This research investigated the impact of sludge type, polymer type (percent mole charge), dosage, mixing rate, and solution ionic strength on bound water content of sludge flocs. Data determined to evaluate the extent of dewatering included: percent dry solids, bulk density, bound water content (determined by dilatometric method), floc density (determined by isopycnic centrifugation), and cake solids concentrations. Calculated floc densities and bound water contents were compared with measured values. The polymer mole charge had marginal impact on bound water content. The optimal polymer do

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6

Cheung, Mee Chu. "Comparative study of the structural, chemical and physical properties of activated sludge floc from different full-scale wastewater treatment systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0013/MQ33959.pdf.

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7

Fall, Kelsey. "Influence Of Suspended Particle Size And Composition On Particle Image Processing, Estuarine Floc Fractal Properties, And Resulting Estuarine Light Attenuation." W&M ScholarWorks, 2020. https://scholarworks.wm.edu/etd/1593091656.

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Understanding the nature of suspended particles is crucial to explaining water clarity issues in many estuaries, including the Chesapeake Bay and its tidal tributaries. Typical near surface estuarine particles are not individual sediment grains, but rather are clusters of inorganic and organic components known as flocs. Because of their fragile nature, flocs are challenging to observe in-situ, so their influence on the optical properties of the system are not well-known. This dissertation used a combination of state-of-the-art optical instrumentation, including laser scattering and transmissom

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8

Koivuranta, E. (Elisa). "Optical monitoring of flocs and filaments in the activated sludge process." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526211794.

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Abstract Flocculation plays a critical role in the activated sludge process, where flocs are removed by settling and where unsatisfactory flocculation is resulting in poor effluent quality. Control and operation of the process is also challenging as it is sensitive to external and internal disturbances. Furthermore, stricter environmental demands are also being placed on wastewater treatment and discharge quality thus solutions are needed to improve the current systems. A novel optical monitoring method employing a tube flow and a CCD camera was developed to characterize the flocs and filament

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9

Andrew, Philip L. "Experimental and numerical investigations of the off-design flow physics in a supersonic through-flow fan cascade." Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-07282008-134047/.

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10

Sutapa, Ignasius Dwi Atmana. "Propriétés physico-chimiques et décantabilité des boues activées en relation avec le transfert d'oxygène et la biofloculation." Vandoeuvre-les-Nancy, INPL, 1996. http://www.theses.fr/1996INPL068N.

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L’aération et la séparation des boues activées constituent les deux étapes clé pour le bon fonctionnement d'une station d'épuration. L’objectif de ce travail est double: caractériser les paramètres susceptibles d'influencer le processus de transfert d'oxygène dans le milieu de boues activées, et étudier l'aptitude à décanter de celles-ci en relation avec la biofloculation mise en jeu. L’étude du transfert d'oxygène montre que le facteur alpha dépend du degré d'épuration de la pollution introduite: ce facteur augmente lorsque la DCO et donc le OUR dans le milieu de culture diminuent. Mais le fa

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11

Bian, Qi. "Bulk flow properties of wheat." Thesis, Kansas State University, 2014. http://hdl.handle.net/2097/18679.

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Master of Science<br>Department of Grain Science and Industry<br>Kingsly Ambrose<br>Consistent and reliable flow of bulk wheat from hoppers and silos is very significant in wheat handling and processing. Bulk wheat flow challenges such as inconsistent flow, arching, etc., are common during handling. The irregular size and non-uniformity of physical properties, the presence of impurities affects the flow behavior during discharge. Chaff and insects infested kernels are the two most common impurities present in wheat. In this research, the effect of these two impurities on their physical and flo

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12

Mueller, A. J. "Extensional flow of macromolecules in solution." Thesis, University of Bristol, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234875.

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13

Kristensen, Aleksander. "Flow properties of water-based drilling fluids." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for petroleumsteknologi og anvendt geofysikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-23107.

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The objective of this master thesis was to investigate the flow properties of water based drilling fluids, utilizing measurements in both the micro and macro scale. The research was performed on two realistic drilling fluids by the use of a viscometer, a rheometer and a realistic flow loop, where the latter represents the macro scale. The research outcome could possibly improve the understanding of flow behavior in wellbores, and remove uncertainties associated with annular friction. The two fluids utilized in the research was made up with the goal of having equal rheological qualities, when

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14

Hyde, Anthony Richard. "The flow properties of filamentous fermentation broths." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333302.

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15

Akella, Ravi Chandra. "Information flow properties for cyber-physical systems." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2009. http://scholarsmine.mst.edu/thesis/pdf/Akella_09007dcc806406a3.pdf.

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Thesis (M.S.)--Missouri University of Science and Technology, 2009.<br>Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed April 15, 2009) Includes bibliographical references (p. 34-36).

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16

McBride, William James. "Division of multiphase flow at a horizontal bifurcation." Thesis, Queen's University Belfast, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324829.

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17

Massey, Kevin C. "Flow/acoustic coupling in heated and unheated free and ducted jets." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/11971.

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18

Jepson, D. M. "Vertical annular flow : the effects of physical properties." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316862.

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19

Al, Harrasi Mahmood Abdul Wahid Sulaiman. "Fluid flow properties of tight gas-condensate reservoirs." Thesis, University of Leeds, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.582106.

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Tight gas-condensate reservoirs contain large reserves, but can be extremely costly to develop. Understanding the fundamental controls on the fluid flow behaviour of tight gas and gas-condensate reservoirs has the potential to result in more cost-effective reservoir development and help increase the world's producible reserves. Therefore, the principal objective of the thesis is to improve understanding of multiphase flow within tight gas-condensate reservoirs. In order to achieve this objective a series of pore-to-core scale experiments under controlled conditions were performed, followed by

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20

Kojima, Takehiro. "Bulk flow properties of fine binary powder mixtures." Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648838.

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21

Zhu, Junlin. "Effective properties for flow in heterogeneous porous media." Diss., Virginia Tech, 1990. http://hdl.handle.net/10919/39416.

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22

Whang, Kyu-ho. "Static and Flow Properties of Dilute Polymer Solutions." Thesis, University of North Texas, 1991. https://digital.library.unt.edu/ark:/67531/metadc501073/.

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Small weight percentages of certain high-molecular weight polymers added to liquids in turbulent flow through conduits can result in dramatic friction reduction. Although many current and potential uses of the drag reduction phenomenon exist, there is a fundamental problem: drag reduction efficacy decreases rapidly with flow time due to the mechanical degradation in flow of the added polymer. In this thesis study, dilute aqueous solutions of polyacrylamide were tested under turbulent flow conditions in an attempt to determine where mechanical degradation in flow occurs.

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23

Mitchell, Thomas Matthew. "The fluid flow properties of fault damage zones." Thesis, University of Liverpool, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485852.

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Quantification of the fluid flow properties of the Earth's crust is an essential precursor to the understanding of a wide range of geological processes, including earthquake generation and crustal strength, and the recovery of natural resources. Faults playa key role in the migration of fluids around the ;Earth's crust, and therefore the fluid flow properties of fractured rocks and how these properties evolve with time are of major importance. This thesis aims to improve our understanding of the hydraulic transport properties of large fault zones by presenting a large dataset of detailed field

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24

Arowosola, Babatunde Clement. "Influence of particle-scale properties and gravitational field on flow properties of granular materials." Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/13295/.

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The complexities in the processing behaviour of granular materials under different gravitational environments pose challenges to the researchers in a number of multidisciplinary fields. The micromechanical behaviour of granular materials is inherently heterogeneous due to its discrete nature. Generally, the macroscopic behaviour of granular materials can be determined by accounting for the inter-particle interactions that exist within. Although significant progress has been achieved in the past especially on the transport, handling and storage of granular materials in confined geometries under

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25

Parker, A. R. "Particle interactions in fluid suspensions." Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384501.

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26

Mishra, Phoolendra Kumar. "Pumping test inference of saturated/unsaturated aquifer properties." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/194085.

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Analytical solutions for aquifer response to pumping are commonly used to infer the hydraulic properties of aquifers. This dissertation develops new analytical solutions for the analysis of pumping test data from confined and unconfined aquifer.An analytical solution for flow to a partially penetrating well of infinitesimally small radius in a compressible unconfined aquifer is developed that allows inferring its saturated and unsaturated hydraulic properties from drawdowns recorded in the saturated and/or the unsaturated zone. The effects of unsaturated zoneconstitutive parameters and thickne

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27

Hamburger, Thomas. "Aerosol microphysical properties during anticyclonic flow conditions over Europe." Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-127766.

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28

Vladu, Maria-Camelia. "Calcium sulphoaluminate hydrates : crystal growth, stability and flow properties." Thesis, University of Edinburgh, 2005. http://hdl.handle.net/1842/11506.

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The calcium sulphoaluminate hydrates are important components of Portland cement and constitute the principal matrix formers of some sulphoaluminate cements. Their practical importance lies in the involvement as intermediates and products of the hydration of portland cements under geothermal conditions. Ettringite is a complex mineral (Ca<sub>6</sub>[Al(OH)<sub>6</sub>]<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>.26H<sub>2</sub>O) formed during the initial stages of Portland cement hydration at ambient temperature, by reaction of sulphate ions released by gypsum (CaSO<sub>4</sub>.2H<sub>2</sub>O)

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29

Polanco, Juan Ignacio. "Lagrangian properties of turbulent channel flow : a numerical study." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1043/document.

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La perspective lagrangienne, décrivant un écoulement selon les trajectoires de traceurs fluides, est une approche naturelle pour étudier les phénomènes de dispersion dans les écoulements turbulents. En turbulence de paroi, le mouvement des traceurs est influencé par le cisaillement moyen et par une forte inhomogénéité et anisotropie en proche paroi. On étudie les propriétés lagrangiennes d’un écoulement de canal turbulent par simulation numérique directe à un nombre de Reynolds modéré. Les statistiques d’accélération lagrangienne sont comparées aux expériences de suivi de particules réalisées

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30

Jacobs, Bruce Lee. "Effective properties of multiphase flow in heterogeneous porous media." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9697.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, February 1999.<br>Includes bibliographical references (leaves 218-224).<br>The impact of heterogeneity on multiphase fl.ow is explored using a spectral perturbation technique employing a stationary, stochastic representation of the spatial variability of soil properties. A derivation of the system's effective properties - nonwetting phase moisture content, capillary pressure, normalized saturation and permeability - was developed which is not specific as to the form of the permeability depende

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31

Franc, Jacques. "Two-phase flow properties upscaling in heterogeneous porous media." Phd thesis, Toulouse, INPT, 2018. http://oatao.univ-toulouse.fr/21684/1/FRANC_Jacques.pdf.

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The groundwater specialists and the reservoir engineers share the same interest in simulating multiphase flow in soil with heterogeneous intrinsic properties. They also both face the challenge of going from a well-modeled micrometer scale to the reservoir scale with a controlled loss of information. This upscaling process is indeed worthy to make simulation over an entire reservoir manageable and stochastically repeatable. Two upscaling steps can be defined: one from the micrometer scale to the Darcy scale, and another from the Darcy scale to the reservoir scale. In this thesis, a new second u

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32

McGuire, Cameron. "Granular flow properties of food powders in extrusion processing." Thesis, Kansas State University, 2017. http://hdl.handle.net/2097/38220.

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Master of Science<br>Department of Grain Science and Industry<br>Sajid Alavi<br>This study relates raw material particulate rheology to the granular flow in a single screw food extruder. Raw materials based on corn (i.e. meal, flour, and starch), wheat (i.e. farina, flour and starch), and sucrose (i.e. granulated, superfine, and powdered) were used as model particulate systems for the study. Various particulate-scale characteristics and flow parameters of these nine materials were determined using a powder rheometer. Properties such as basic flow energy, cohesion, flow function, and effective

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33

Appiah, Kwadwo Ampofo. "Microstructural and microanalytical characterization of laminated (C-SiC) matrix composites fabricated by forced-flow thermal-gradient chemical vapor infiltration (FCVI)." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/14910.

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34

Morell, Albert T. "Model for Flow Properties Across the Opening of Normal Bleed Holes in Supersonic Flow." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1519909987871461.

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35

Sugami, Yuitsu. "ALTERNATIVE DIESELS FROM PLANT OILS AND THEIR EVALUATION OF FUEL PROPERTIES." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225703.

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36

Sutton, Kaylee B. "Post-Application Flow Properties of Architectural Paints: The Link Between Environmental Factors, Rheology, and Application Properties." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1578905387807612.

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37

Stewart, David G. "Thermophysical properties of gases and gas mixtures for critical flow nozzle applications." Thesis, University of Strathclyde, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248763.

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38

Karaman, Turker. "Prediction Of Multiphase Flow Properties From Nuclear Magnetic Resonance Imaging." Phd thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610382/index.pdf.

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In this study a hybrid Pore Network (PN) model that simulates two-phase (water-oil) drainage and imbibition mechanisms is developed. The developed model produces Nuclear Magnetic Resonance (NMR) T2 relaxation times using correlations available in the literature. The developed PN was calibrated using experimental relative permeability data obtained for Berea Sandstone, Kuzey Marmara Limestone, Yenik&ouml<br>y Dolostone and Dolomitic Limestone core plugs. Pore network body and throat parameters were obtained from serial computerized tomography scans and thin section images. It was observed that

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39

Belyadi, Fatemeh. "Determining low permeability formation properties from absolute open flow potential." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4879.

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Thesis (M.S.)--West Virginia University, 2006.<br>Title from document title page. Document formatted into pages; contains viii, 63 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 36-42).

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40

Goodman, Matthew R. "Properties of Stochastic Flow and Permeability of Random Porous Media." Thesis, The University of Arizona, 2010. http://hdl.handle.net/10150/193422.

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Thermosolutal fluid flow has a strong influence on the evolution of solidification microstructures. While porous media theory and volume-averaged permeability relations give a basis to quantify these phenomena, traditional methods of permeability estimation used for random porous media fail to adequately characterize the full relation of microstructural morphology to volume-average permeability. Most significantly, the link between microstructural parameters and permeability is treated as a deterministic function at all scales, ignoring the variability inherent in porous media.The variation

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41

Leese, Hannah. "Electroosmosis in nanoporous membranes : connecting material properties to flow behaviour." Thesis, University of Bath, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.601631.

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The development of nanoporous materials has received considerable attention in nanofluidic studies in recent years. Furthering earlier research, the present thesis offers a systematic study of two nanoporous materials-nanoporous alumina membranes and carbon nanotube membranes-with a view to establishing their electroosmotic and fluid-flow behaviour at the nanoscale. The nanoporous alumina membranes were studied for their own electroosmotic and fluid-flow properties, and utilised as templates for the production of the carbon nanotube membranes also investigated in this study. The advanced contr

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42

Palit, Imon Joydipto. "The effects of strategic behaviour on properties of order flow." Thesis, University of Essex, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.617086.

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This thesis seeks a better understanding of the role that endogenous dynamics plays in financial markets. We investigate the intra-day dynamics of trading in stock markets by means of computer simulations and empirical analysis of high-frequency data. We show that the strategic behaviour of interacting liquidity taking and providing agents plays an important role in explaining the phenomena of volatility clustering, long-memory in order flow and stable- U-shape intra-day volume dynamics that are-observed in pure order driven markets. We first construct a zero-intelligence model to reproduce or

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43

Eastman, John. "The shear and extensional flow properties of polymer/surfactant solutions." Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319075.

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44

Caba, Aaron C. "Characterization of Carbon Mat Thermoplastic Composites: Flow and Mechanical Properties." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29104.

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Carbon mat thermoplastics (CMT) consisting of 12.7 mm or 25.4 mm long, 7.2 micrometer diameter, chopped carbon fibers in a polypropylene (PP) or poly(ethylene terephthalate) (PET) thermoplastic matrix were manufactured using the wetlay technique. This produces a porous mat with the carbon fibers well dispersed and randomly oriented in a plane. CMT composites offer substantial cost and weight savings over typical steel construction in new automotive applications. In production vehicles, automotive manufacturers have already begun to use glass mat thermoplastic (GMT) materials that use glass fib

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45

Soszyński, Robert Marian. "The formation and properties of coherent flocs in fibre suspensions." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/27544.

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Fibres in concentrated suspensions are in continuous contact with other fibres and may interlock through elastic bending to form coherent networks. Such interlocking is termed Type-C cohesion. The process by which Type-C cohesion forms among fibres and the resulting structure and tensile strength of individual floes of fibres have been examined in experimental study in which relatively straight, smooth nylon (6-6) fibres of aspect ratios from 65 to 189 were suspended in aqueous-sugar solutions. The fibres were in most cases neutrally buoyant. The suspensions were caused to flow in a partially

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46

Li, Zihao. "Experimental, Theoretical, and Numerical Investigations of Geomechanics/Flow Coupling in Energy Georeservoirs." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/104895.

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The development of hydrocarbon energy resources from shale, a fine-grained, low-permeability geological formation, has altered the global energy landscape. Constricting pressure exerted on a shale formation has a significant effect on the rock's apparent permeability. Gas flow in low-permeability shales is significantly different from liquid flow due to the Klinkenberg effect caused by gas molecule slip at the nanopore wall surfaces. This has the effect of increasing apparent permeability (i.e., the measured permeability). Optimizing the conductivity of the proppant assembly is another critica

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47

Anwar, Adeel. "Enhancing properties of biodiesel via heterogeneous catalysis." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/enhancing-properties-of-biodiesel-via-heterogeneous-catalysis(7e52f44f-4c50-4cd3-b5a8-cf6ce714b7d6).html.

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Biodiesel is a re-emerging biofuel as an alternative to the traditional petroleum derived diesel. There are however, several factors that currently hinder the widespread uptake. Majority of the biodiesel are currently produced from edible oils thereby sparking the food versus fuel debate, the cost of feedstock is significantly high, there are problems experienced in the traditional production process and the resulting fuel is of inadequate quality. This work focused on addressing the issue of poor cold flow properties to improve the overall quality of biodiesel. The skeletal isomerisation of l

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48

Xu, Wenyue. "Towards numerical modeling of two-phase flow in seafloor hydrothermal systems." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/26014.

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49

Milne, Fraser Dalton. "Topographic and material controls on the Scottish debris flow geohazard." Thesis, University of Dundee, 2008. https://discovery.dundee.ac.uk/en/studentTheses/eb4a6b03-8024-4818-8e92-ce1fd3c77209.

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Debris flows can be considered the most significant geological hazard in areas of high relief in Scotland having impacted upon slope foot infrastructure several times in recent years. The potency of this geohazard is anticipated to increase over the coming decades due to a climatologically enforced upturn in debris flow frequency. In thisresearch material and topographic controls on debris flow activity are investigated using a combination of field and laboratory based analysis of debris flows at six study sites across upland Scotland. Centrifuge modelling is also used to simulate theinitiatio

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50

Jouini, Dhafer Ben Mahmoud Carleton University Dissertation Engineering Mechanical. "Experimental investigation of the ventilation air flow properties in an office space." Ottawa, 1992.

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