Relevant bibliographies by topics / Equilibrium floc size

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Equilibrium floc size'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Equilibrium floc size"

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Ding, Shi Qiang, Yuan Yuan Wei, Xin Rong Pang, and Ji Run Xu. "A Research on the Morphology and Composition of Flocs (Part 2: Floc Breakage Included)." Advanced Materials Research 726-731 (August 2013): 1585–90. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.1585.

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The floc breakage plays an important role in the flocculation, the stable floc size or morphology distribution is the result of the equilibrium of formation and breakage. In this paper, the breakage approaches or models for different kind and size of flocs have been discussed. By introducing special breakage functions and comparing their relative values, the numbers of various flocs are verified to be still proportional to the suspension concentration compared with the situation in which the breakage is neglected. However, as illustrated in this paper, the total number of every kind of floc is
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Tarpley, Harris, Friedrichs, and Sherwood. "Tidal Variation in Cohesive Sediment Distribution and Sensitivity to Flocculation and Bed Consolidation in An Idealized, Partially Mixed Estuary." Journal of Marine Science and Engineering 7, no. 10 (2019): 334. http://dx.doi.org/10.3390/jmse7100334.

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Particle settling velocity and erodibility are key factors that govern the transport of sediment through coastal environments including estuaries. These are difficult to parameterize in models that represent mud, whose properties can change in response to many factors, including tidally varying suspended sediment concentration (SSC) and shear stress. Using the COAWST (Coupled Ocean-Atmosphere-Wave-Sediment Transport) model framework, we implemented bed consolidation, sediment-induced stratification, and flocculation formulations within an idealized two-dimensional domain that represented the l
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Papavasilopoulos, E. N., and D. H. Bache. "Parallel studies on dewatering and conditioning of an alum sludge and an aluminium hydroxide suspension." Water Science and Technology 44, no. 10 (2001): 293–99. http://dx.doi.org/10.2166/wst.2001.0644.

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The paper shows a comparison between properties of an alum sludge gained from the coagulation of a coloured water with those of a suspension of aluminium hydroxide at a concentration equivalent to the coagulant fraction within the sludge. Background information is provided on composition and aspects of the source floc. The comparisons embraced floc size, polymer adsorption, and dewatering parameters including specific resistance to filtration, capillary suction time and the equilibrium moisture content under pressure. In all cases, there were strong similarities in the behaviour of the two sus
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Shakeel, Ahmad, Zeinab Safar, Maria Ibanez, Leon van Paassen, and Claire Chassagne. "Flocculation of Clay Suspensions by Anionic and Cationic Polyelectrolytes: A Systematic Analysis." Minerals 10, no. 11 (2020): 999. http://dx.doi.org/10.3390/min10110999.

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The characteristics of clayey suspensions, majorly composed of quartz microparticles, in the presence of anionic and cationic polyelectrolytes were investigated using different techniques. A wide range of clay concentrations was used, i.e., from 0.07 to 1000 g/L for different experimental techniques, based on the fact that the clay concentration possible to analyze with selected experimental methods was significantly different. The optimum flocculant to clay ratio was defined as the ratio that gives the fastest initial floc growth by static light scattering or fastest initial settling velocity
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Lerch, A. "Introducing a slow cross-flow at the capillary outlet in comparison to conventional dead-end mode—a trajectory analysis of the effects." Water Supply 8, no. 4 (2008): 389–99. http://dx.doi.org/10.2166/ws.2008.089.

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A model has been developed, based on the finite element method (FEM) of computational fluid dynamics (CFD), for the description of the complete flow field and concentration distribution inside a membrane capillary, driven in inside-out and dead-end or ‘slow’ cross-flow mode, sometimes referred to as ‘bleed flow’. Particle or floc transport and deposition have been described by trajectory analysis, i.e. superimposing the calculation of forces and torques acting on the particles or flocs, based on the previously modelled fluid flow field. The model is used to give an overview of deposition behav
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Lerch, A., W. Uhl, and R. Gimbel. "CFD modelling of floc transport and coating layer build-up in single UF/MF membrane capillaries driven in inside-out mode." Water Supply 7, no. 4 (2007): 37–47. http://dx.doi.org/10.2166/ws.2007.141.

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A model was developed, based on finite element method (FEM), here as computational fluid dynamics (CFD) for the description of the complete flow field and concentration distribution inside a membrane capillary, driven in inside-out mode. Particle or floc transport and deposition was described by superimposing the calculation of forces and torques equilibria on the previously modelled fluid flow field. The model is used to give an overview of deposition behaviour of flocs of certain size in dead-end filtration. Results are exemplarily shown for different sized flocs. The results can be used to
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THROUMOULOPOULOS, G. N., H. TASSO, and G. POULIPOULIS. "Side-conditioned axisymmetric equilibria with incompressible flows." Journal of Plasma Physics 74, no. 3 (2008): 327–44. http://dx.doi.org/10.1017/s0022377807006769.

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AbstractAxisymmetric equilibria with incompressible flows of arbitrary direction are studied in the framework of magnetohydrodynamics under a variety of physically relevant side conditions consisting, for example, in that the plasma temperature or the magnetic field modulus are uniform on magnetic surfaces. To this end a set of pertinent nonlinear ordinary differential equations (ODEs) are transformed to quasilinear ODEs and the respective initial value problem is solved numerically with appropriately determined initial values near the magnetic axis. Several equilibrium configurations are then
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Önen, Fevzi, and Hayrullah Agaçcioglu. "Scour at a side-weir intersection located on an alluvial river." Hydrology Research 38, no. 2 (2007): 165–76. http://dx.doi.org/10.2166/nh.2007.005.

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An experimental investigation of the equilibrium depth of local scour around side-weirs located on an alluvial river is presented in this paper. A sand bar in the middle of the channel and a scour hole close to the weir side is formed because of changes in shear stress field and velocity at the downstream end of the side weir. The depth of clear-water scour increases by time and approaches the equilibrium state asymptotically depending on approach flow velocity. The equilibrium depth of scour increases by the increase of the dimensionless parameters of approach flow velocity, water head ratio,
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Asmolov, Evgeny S., Alexander L. Dubov, Tatiana V. Nizkaya, Jens Harting, and Olga I. Vinogradova. "Inertial focusing of finite-size particles in microchannels." Journal of Fluid Mechanics 840 (February 14, 2018): 613–30. http://dx.doi.org/10.1017/jfm.2018.95.

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At finite Reynolds numbers, $Re$, particles migrate across laminar flow streamlines to their equilibrium positions in microchannels. This migration is attributed to a lift force, and the balance between this lift and gravity determines the location of particles in channels. Here we demonstrate that velocity of finite-size particles located near a channel wall differs significantly from that of an undisturbed flow, and that their equilibrium position depends on this, referred to as slip velocity, difference. We then present theoretical arguments, which allow us to generalize expressions for a l
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Chen, Wei Qiang, Majid Sedighi, and Andrey P. Jivkov. "Thermo-osmosis in hydrophilic nanochannels: mechanism and size effect." Nanoscale 13, no. 3 (2021): 1696–716. http://dx.doi.org/10.1039/d0nr06687g.

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Mechanistic understanding of thermo-osmosis at nano scale is linked with non-equilibrium thermodynamics of the phenomenon. Fluid molecules at the boundary layers of solid surfaces experience a driving force which generates thermo-osmotic flow.
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Dissertations / Theses on the topic "Equilibrium floc size"

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Tran, Duc Anh. "Experiments on the Transformation of Mud Flocs in Turbulent Suspensions." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/83606.

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This dissertation aims to better understand how floc aggregate characteristics and behaviors are modified under different local conditions and how such alterations impact the floc settling velocity, which is one of the most crucial parameters influencing sediment transport modeling. A series of laboratory experiments were conducted to examine the impact of suspended sediment concentration, mixes of clay and silt, and resuspension process to equilibrium floc size and floc settling velocity. In order to observe floc size evolution, a new floc imaging acquisition was first developed. This new m
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Bhattarai, Pawan Kumar. "Study on River Dyke Breach Characteristics by Overtopping Flow." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/202685.

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Debry, Edouard. "Modélisation et simulation numérique de la dynamique des aérosols atmosphériques." Phd thesis, Ecole des Ponts ParisTech, 2004. http://pastel.archives-ouvertes.fr/pastel-00001030.

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Des modèles de chimie transport permettent le suivi réaliste des polluants en phase gazeuse dans l'atmosphère. Cependant, lapollution atmosphérique se trouve aussi sous forme de fines particules en suspension, les aérosols, qui interagissent avec la phase gazeuse, le rayonnement solaire, et possèdent une dynamique propre. Cette thèse a pour objet la modélisation et la simulation numérique de l'Equation Générale de la Dynamique des aérosols (GDE). La partie I traite de quelques points théoriques de la modélisation des aérosols. La partie II est consacrée à l'élaboration du module d'aérosols rés
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Books on the topic "Equilibrium floc size"

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Kimura, T., and Y. Otani. Magnetization switching due to nonlocal spin injection. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198787075.003.0021.

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This chapter discusses and presents a schematic illustration of nonlocal spin injection. In this case, the spin-polarized electrons are injected from the ferromagnet and are extracted from the left-hand side of the nonmagnet. This results in the accumulation of nonequilibrium spins in the vicinity of the F/N junctions. Since the electrochemical potential on the left-hand side is lower than that underneath the F/N junction, the electron flows by the electric field. On the right-hand side, although there is no electric field, the diffusion process from the nonequilibrium into the equilibrium sta
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Book chapters on the topic "Equilibrium floc size"

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Winterwerp, Johan. "Equilibrium And Nonequilibrium Floc Sizes." In Flocculation in Natural and Engineered Environmental Systems. CRC Press, 2004. http://dx.doi.org/10.1201/9780203485330.ch12.

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Fogarty, Michael J., and Jeremy S. Collie. "Production at the Ecosystem Level." In Fishery Ecosystem Dynamics. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198768937.003.0010.

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The development of ecosystem models can be size-based, species-based, or trophocentric. In all cases, equilibrium mass-balance descriptions of ecosystems can be translated to dynamic models. Linear network models trace the flow of energy through food webs. Starting from the base of the food web, they can be solved from the bottom up to calculate how many predators can be supported for a given level of primary production. Conversely, the food web can be solved from the top down to calculate how much primary production is required to support fisheries yield, given the dietary requirements of top predators. These models typically employ species-level and/or trophic-level designations for the nodes in the model. Biomass-spectrum models in contrast are based on body size dimensions (typically weight) rather than any taxonomic designation. Biogeochemical models provide another approach to developing ecosystem production models by making the connection between the availability of key nutrients and ecosystem production.
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West-Eberhard, Mary Jane. "Punctuation." In Developmental Plasticity and Evolution. Oxford University Press, 2003. http://dx.doi.org/10.1093/oso/9780195122343.003.0038.

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In punctuated evolution (Eldredge and Gould, 1972) periods of relatively little change (“stasis”) are punctuated by episodes of relatively rapid change in the rate of evolution of a quantitative morphological trait, as seen in the fossil record of morphology. According to Simpson (1984), the term quantum evolution, refers to the same thing. Like Eldredge and Gould, Simpson contrasted quantum evolution with phyletic change, or sustained directional evolution without branching; considered that it could be associated with speciation (though also with phyletic evolution; p. 206); and even mentioned interrupted equilibra “In phyletic evolution equilibrium of the organism-environment system is continuous, or nearly so, although the point of equilibrium may and usually does shift. In quantum evolution equilibrium is lost, and a new equilibrium is reached”. I use the term “punctuation” rather than “quantum” because it less ambiguously describes change in rate of evolution. In its original meaning (from the Latin quantus), quantum means quantity. But quantum change, as mentioned by Simpson, is identified with the “quanta” of physics, which are discrete units of energy. This could encourage mistaken identification of punctuated change with the origin of discrete novelties, not the intended meaning of punctuated evolution, which is periodically altered rate of change in a continuously variable, quantitative trait. Mayr, Eldredge, Gould, and others (e.g., Stanley, 1979, 1981) explain stasis and punctuation in terms of speciation. Speciational punctuation hypotheses see stasis as due to the characteristics of established biological species, such as gene flow within interbreeding populations, large population size, heterogeneity of the species environment that retards directional change, developmental integration, canalization, coadapted genomes, stabilizing selection, and frequently reversing evolution over time within established species (Eldredge and Gould, 1997). These factors have been summarized by the term “gene-pool cohesiveness” (Mayr, 1989) or “developmental coherences” (Gould, 1989b), though the causes of stasis under the speciational hypothesis are admittedly vague and debatable (for reviews of other possible causes of stasis, see Williamson, 1987; Coyne and Charlesworth, 1997; Van Valen, 1982a; Spicer, 1993).
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Kobayashi, Shiro, Soo-Ik Oh, and Taylan Altan. "Solid Formulation, Comparison of Two Formulations, and Concluding Remarks." In Metal Forming and the Finite-Element Method. Oxford University Press, 1989. http://dx.doi.org/10.1093/oso/9780195044027.003.0019.

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In the previous chapters we have discussed only the applications of flow formulation to the analysis of metal-forming processes. Lately, elastic-plastic (solid) formulations have evolved to produce techniques suitable for metal-forming analysis. This evolution is the result of developments achieved in large-strain formulation, beginning from the infinitesimal approach based on the Prandtl–Reuss equation. A question always arises as to the selection of the approach—“flow” approach or “solid” approach. A significant contribution to the solution of this question was made through a project in 1978, coordinated by Kudo, in which an attempt was made to examine the comparative merits of various numerical methods. The results were compiled for upsetting of circular solid cylinders under specific conditions, and revealed the importance of certain parameters used in computation, such as mesh systems and the size of an increment in displacement. This project also showed that the solid formulation needed improvement, particularly in terms of predicting the phenomenon of folding. For elastic-plastic materials, the constitutive equations relate strain–rate to stress–rates, instead of to stresses. Consequently, it is convenient to write the field equation in the boundary-value problem for elastic-plastic materials in terms of the equilibrium of stress rates. In this chapter, the basic equations for the finite-element discretization involved in solid formulations are outlined both for the infinitesimal approach and for large-strain theory. Further, the solutions obtained by the solid formulation are compared with those obtained by the flow formulation for the problems of plate bending and ring compression. A discussion is also given concerning the selection of the approach for the analysis. In conclusion, significant recent developments in the role of the finite-element method in metal-forming technology are summarized. The field equation for the boundary-value problem associated with the deformation of elastic-plastic materials is the equilibrium equation of stress rates. As stated in Chap. 1 (Section 1.3), the internal distribution of stress, in addition to the current states of the body, is supposed to be known, and the boundary conditions are prescribed in terms of velocity and traction-rate.
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Bon Hoa, Gaston Hui, and Carmelo Di Primo. "Application of Pressure Relaxation to the Study of Substrate Binding to Cytochrome P-450cam versus Temperature, Pressure, and Viscosity." In High Pressure Effects in Molecular Biophysics and Enzymology. Oxford University Press, 1996. http://dx.doi.org/10.1093/oso/9780195097221.003.0015.

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The pressure-jump relaxation technique is a convenient and interesting means of studying rapid reversible reactions of biological systems. According to the change in reaction volume that accompanies a biochemical process, a rapid pressure change Δp produces a relative equilibrium shift ΔK/K, which is given by ΔlnK = AK/K = — (ΔV°/RT) Δp, where ΔV° is the reaction volume change. If the pressure change has a very short transition time, then relaxation kinetic measurements near equilibrium are possible, allowing the elucidation of reaction mechanisms through the detection of eventual reaction intermediates and the characterization of elementary kinetic and thermodynamic parameters. Our reversible pressure-jump method described in this chapter is capable of producing a sharp pressure change of ±20MPa in less than 3 milliseconds allowing the determination of relaxation rates in the time range of several milliseconds to several minutes at any final pressure up to 400 MPa, and in any viscosity solution. This technique was employed to study the binding kinetics of camphor and its analogues to bacterial cytochrome P-450cam as functions of temperature, pressure, and viscosity. The results obtained are discussed in terms of conformational dynamics of the protein associated with the entry and the exist of water molecules and specific interactions of the substrate1 with the apolar residues in the active site of cytochrome P-450cam. The binding of ligands or substrates to proteins can exhibit multistate kinetic behavior similar to transient-stale enzyme kinetics and isomerizations of proteins. The underlying elementary reaction mechanisms can be elucidated by the use of rapid mixing techniques. Usually a reaction is initiated by mixing the reactants as rapidly as possible, and the approach to equilibrium is monitored. This method has been adapted to the study of enzyme reaction mechanisms under extreme conditions of temperature and pressure (Hui Bon Hoa & Douzou, 1973; Balny et al., 1984). However, this approach is limited by the deadtime, the large amount of sample required, and difficulties in using the apparatus to study viscous solutions, such as Schlieren effects, caused by incomplete mixing in flow experiments. Relaxation techniques overcome these problems by the application of a physical perturbation to a system already at equilibrium.
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"Introduction." In Simulation and Modeling of Turbulent Flows, edited by Thomas B. Gatski, M. Yousuff Hussaini, and John L. Lumley. Oxford University Press, 1996. http://dx.doi.org/10.1093/oso/9780195106435.003.0004.

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The aim of this book is to provide the engineer and scientist with the necessary understanding of the underlying physics of turbulent flows, and to provide the user of turbulence models with the necessary background on the subject of turbulence to allow them to knowledgeably assess the basis for many of the state-of-the-art turbulence models. While a comprehensive review of the entire field could only be thoroughly done in several volumes of this size, it is necessary to focus on the key relevant issues which now face the engineer and scientist in their utilization of the turbulent closure model technology. The organization of this book is intended to guide the reader through the subject starting from key observations of spectral energy transfer and the physics of turbulence through to the development and application of turbulence models. Chapter 1 focuses on the fundamental aspects of turbulence physics. An insightful analysis of spectral energy transfer and scaling parameters is presented which underlies the development of phenomenological models. Distinctions between equilibrium and nonequilibrium turbulent flows are discussed in the context of modifications to the spectral energy transfer. The non-equilibrium effects of compressibility are presented with particular focus on the alteration to the turbulent energy dissipation rate. The important topical issue of coherent structures and their representation is presented in the latter half of the chapter. Both Proper Orthogonal Decomposition and wavelet representations are discussed. With an understanding of the broad dynamic With an understanding of the broad dynamic range covered by both the turbulent temporal and spatial scales, as well as their modal interactions, it is apparent that direct numerical simulation (DNS) of turbulent flows would be highly desirable and necessary in order to capture all the relevant dynamics of the flow. Such DNS methods, in which all the important length scales in the energy-containing range and in the dissipation range are accounted for explicitly is presented in Chapter 2. Emphasis is on spectral methods for incompressible flows, including the divergence-free expansion technique. Vortex methods for incompressible bluff body flows are described and some techniques for compressible turbulent flow simulations are also discussed briefly.
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Harrison, Roger G., Paul W. Todd, Scott R. Rudge, and Demetri P. Petrides. "Precipitation." In Bioseparations Science and Engineering. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780195391817.003.0011.

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Precipitation, which is the process of coming out of solution as a solid, is an important method in the purification of proteins that usually comes early in the purification process. Precipitation is frequently used in the commercial separation of proteins. The primary advantages of precipitation are that it is relatively inexpensive, can be carried out with simple equipment, can be done continuously, and leads to a form of the protein that is often stable in long-term storage. Since precipitation is quite tolerant of various impurities, including nucleic acids and lipids, it is used early in many bioseparation processes. The goal of precipitation is often concentration to reduce volume, although significant purification can sometimes be achieved. For example, all the protein in a stream might be precipitated and redissolved in a smaller volume, or a fractional precipitation might be carried out to precipitate the protein of interest and leave many of the contaminating proteins in the mother liquor. In this chapter the focus is first upon protein solubility, which is the basis of separations by precipitation. Then we discuss the basic concepts of particle formation and breakage and the distribution of precipitate particle sizes. The specific methods that can be used to precipitate proteins are treated next. The chapter concludes with methodology to use for the design of precipitation systems. After completing this chapter, the reader should be able to do the following: • Explain the various factors that influence protein solubility. • Use the Cohn equation to predict solution equilibria (precipitation recoveries). • Identify the distinct steps in the development of a precipitate. • Calculate mixing times in an agitated precipitator, the kinetics of diffusion-limited growth of particles, and the kinetics of particle-particle aggregation. • Perform particle balances as a function of particle size in a continuous-flow stirred tank reactor (CSTR). • Explain the methods used to cause precipitation. • Outline the advantages and disadvantages of the three basic types of precipitation reactor: the batch reactor, the CSTR, and the tubular reactor. • Implement simple scaling rules for a precipitation reactor.
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Bayly, Brian. "Summary." In Chemical Change in Deforming Materials. Oxford University Press, 1993. http://dx.doi.org/10.1093/oso/9780195067644.003.0024.

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The purpose of this chapter is to consolidate. No new ideas are introduced; instead we try to sort the main thread from the side issues, and the parts that are reasonably clear and firm from the parts that are still fuzzy. The core of the chapter is a set of seventeen statements, seventeen vertebrae that form the backbone of the book, but there are also a preface and a postscript. The preface provides the setting for the seventeen-part core and the postscript takes up the question of where to go next. The purpose of the book was given at the start of Chapter 1. Even at that early point, a stressed cylinder was used as an example. The purpose is to make headway with the question: if a state of chemical equilibrium exists under hydrostatic stress and is disturbed by making the stress nonhydrostatic, what processes begin to run, and what quantitative relations should we expect to be followed? Before the seventeen-part "answer" it is to be noted that there are two alternative ways of dividing the subject matter into two parts. The division scheme is displayed in Figure 17.1a and separates eight types of change. (A somewhat similar diagram on page 111, distinguished eight circumstances in which change might be observed—a different system of divisions that is of no use here.) Of the eight boxes set up, four have been discussed, as shown in Figure 17.1b. The two ways of dividing this four-box group are by a horizontal cut or by a vertical cut that separates stars from superscript a’s. (A vertical cut separating the N-box from the rest is of no help; it would be contrary to our theme.) The horizontal cut separates stress-driven effects below from composition-driven effects above. It is in fact the traditional division between mechanics and chemistry; enormous amounts of science fall clearly above the cut or clearly below it and cause no confusion at all. This cut was used as a guide in the early chapters, especially in the flow diagram or organization chart, Figure 8.1. By contrast, the second cut appeared as late as Chapter 15, but deserves emphasis; it is at least as instructive and helpful as the first, and perhaps more helpful.
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Conference papers on the topic "Equilibrium floc size"

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Li, Wei. "Non-Equilibrium Thermal Fluctuation in Flow." In ASME 2020 Fluids Engineering Division Summer Meeting collocated with the ASME 2020 Heat Transfer Summer Conference and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/fedsm2020-20131.

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Abstract Non-equilibrium thermal fluctuations present as wave elements in a flow. A wave element is the wave interface between two molecule groups with different temperature; it is generated by density difference which results from temperature difference. Tiny temperature differences always exist everywhere in a fluid. When the fluid is in motion, wave elements are generated among molecule groups. Wave motion and Brownian motion may be the two basic forms of motion of molecules in flow. Brownian motion is controlled by temperature. Wave elements are caused by temperature differences and the mo
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Maekawa, Munenori, Naoki Shimada, Kouji Kinoshita, Akira Sou, and Akio Tomiyama. "Numerical Simulation of Heterogeneous Bubbly Flow in a Bubble Column." In ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/fedsm2006-98178.

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Numerical methods for predicting heterogeneous bubbly flows are indispensable for the design of a Fisher-Tropsh reactor for GTL (Gas To Liquid). It is necessary to take into account bubble size distribution determined by bubble coalescence and breakup for the accurate prediction of heterogeneous bubbly flows. Hence we implemented several bubble coalescence and breakup models into the (N+2) field model, which is a hybrid combination of an interface tracking method and a multi-fluid model. Void and bubble size distributions in an open rectangular bubble column were measured and compared with pre
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Tsukuda, Tomohiko, Hiroki Sato, Daisuke Nomura, Sakae Kawasaki, and Naoki Shibukawa. "An Experimental Investigation of Thermal Wetness Loss in the Full Scale Size Low Pressure Turbine." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26012.

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Experimental investigation with a full scale low pressure steam turbine is carried out to reveal the thermal wetness loss. This paper focuses on thermal wetness loss of the last stage in a six-stage low pressure turbine. The temperature of superheating at the inlet of the last stage varies within a range of several tens of degrees under the condition that enthalpy at the stage outlet is below the saturation point. Radial distributions of pressure and temperature at the stage inlet and outlet are measured with rake probes and traverse probes, whereas the stage outlet enthalpy is identified by u
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Kim, Changhyun, JaeHyeon Park, DongIl Kim, and Jehyun Baek. "Numerical Analysis on Non-Equilibrium Steam Condensing Flow in Rotating Machinery." In ASME 2016 Fluids Engineering Division Summer Meeting collocated with the ASME 2016 Heat Transfer Summer Conference and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fedsm2016-7588.

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Flow of steam, different from other gas flows, involves droplet generation in flow expansion process. This phase transition affects not only the flow fields, but also machine performance including efficiency. In addition, it is totally harmful for machine structures as blades and casing. Therefore, prevention or preparation of droplet generation in steam flows is dreadfully important in stable machine operation. Nowadays, Computational Fluid Dynamics (CFD) is widely used in machine design and optimization process. Thus, simulation with CFD should consider this droplet generation phenomena to p
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Edge, Brian A., Eric G. Paterson, and Mario F. Trujillo. "A Scaling Law for Cavitation Inception in Circular Jet Flows." In ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37362.

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The historical data for circular jets indicates that the incipient cavitation number increases with the diameter of the jet. This trend is not explained by the classic cavitation theory which expects incipient cavitation number to remain constant regardless of the jet diameter, flow parameters, or water quality. This paper explores the origins of cavitation scale effects and explains the correlation between the incipient cavitation number, jet diameter, and nuclei size. This is accomplished through turbulence-resolving CFD simulations of the jet flow field at three length scales and Rayleigh-P
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Shin, Soo Jai, and Hyung Jin Sung. "Migration of an Elastic Capsule in a Channel Flow." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-20019.

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The inertial migration of a two-dimensional elastic capsule in a channel flow was studied over the Reynolds number range 1≤Re≤100. The lateral migration velocity, slip velocity, and the deformation and inclination angle of the capsule were investigated by varying the lateral position, Reynolds number, capsule-to-channel size ratio (λ), membrane stretching coefficient (φ), and membrane bending coefficient (γ). During the initial transient motion, the lateral migration velocity increased with increasing Re and λ, but decreased with increases in φ, γ an the lateral distance from the wall. The ini
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Li, Fei, Di Jin, Xiao Jing Liu, and Xu Cheng. "Analysis of Flow Stability Boundaries of ERVC System." In 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-15632.

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ERVC is widely adopted as a part of in-vessel retention (IVR) in severe accident management strategies. In this paper, two-phase flow instability in natural circulation loops of external reactor vessel cooling (ERVC) system in a large size power PWR (CAP 1700 with a thermal power 5000 MWt) is simulated and evaluated by the RELAP5 code. Under certain conditions, flow instability of ERVC system are obtained. It is a kind of density wave oscillation that occurs in non-equilibrium boiling in the heat section and void flashing in the riser at low equilibrium quality and low system pressure. The cal
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Kolev, Nikolay Ivanov. "SKYTHIA: A Universal Multi-Phase Flow Analyzer." In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-31285.

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SKYTHIA is a computer code for computational simulation of transient multi-phase flows based on three multi-component velocity fields in a porous structure that may change its geometry in time. The foundation of the computer code SKYTHIA allows applications for mathematical simulation of a variety of processes. From • two-phase gas-plasma multi-component hydrogen detonation in pipe-network with dissociation of the gases, • through condensation water-steam shock waves in complex pipe networks, • gas solution and dissolution in liquids, dissolved gas release from water in pipe network and gas-sl
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Adhikary, Bishwadipa, Pradip Majumdar, Milivoje Kostic, and Steven A. Lottes. "Simulation of Open Channel Turbulent Flow Over Bridge Decks and Formation of Scour Hole Beneath the Bridge Under Flooding Conditions." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-13258.

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This study is focused on the simulation of open channel turbulent flow over flooded laboratory scale bridge decks and formation of scour holes under various flooding conditions. Solutions for turbulent flow field are based on Reynolds Averaged Navier-Stokes (RANS) equations and turbulence closure models using the STAR-CD commercial computational fluid dynamics (CFD) software. An iterative computational methodology is developed for predicting equilibrium scour profiles using the single-phase flow model with a moving boundary formulation. The methodology relies on an empirical correlation for cr
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Yuan, Chen, Zhenhai Pan, and Huiying Wu. "Numerical Investigation on the Dynamics of a Microparticle Pair Traveling in Confined Flow." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-72297.

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In recent years, particle hydrodynamic focusing and ordering in a confined microchannel has been developed as a promising technique in lab-on-a-chip systems such as microparticle/cell separation, on-chip flow cytometry and detection. During the focusing, the uniformly distributed finite-sized particles from the channel inlet migrate across streamlines to several equilibrium positions according to the balance between series of hydrodynamic lift forces. While most studies in literature focus on single particle’s motion in the hydrodynamic focusing process by considering particle-liquid interacti
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