Cambridge University Press 978-1-108-47374-3 — Dynamics of Multiphase Flows Chao Zhu , Liang-Shih Fan , Zhao Yu Index More Information

Total Page:16

File Type:pdf, Size:1020Kb

Cambridge University Press 978-1-108-47374-3 — Dynamics of Multiphase Flows Chao Zhu , Liang-Shih Fan , Zhao Yu Index More Information Cambridge University Press 978-1-108-47374-3 — Dynamics of Multiphase Flows Chao Zhu , Liang-Shih Fan , Zhao Yu Index More Information Index ABF. See agglomerate bubbling fluidization Basset historic integral. See Basset force abrasive erosion, 508 Basset-Boussinesq-Oseen equation, 82, 105, 176 absorption, 99, 133, 185, 200, 535 BBO equation. See Basset-Boussinesq-Oseen AC. See alternating current equation acceleration number, 106 beam attenuation method, 331–334 acoustic field, 339, 438, 446 bend erosion, 477, 507 acoustic wave, 331, 337–339 Bernoulli equation, 43 added mass, 90, 128, 131, 232, 245, 567 Bernoulli principle, 313, See Bernoulli equation agglomerate bubbling fluidization, 444 binary collision, 62–64, 182 agglomerate particulate fluidization, 444 Biot number, 98 agglomerates, 10, 22, 444, 447 body forces. See field forces agglomeration, 321, 541 boiling, 481, 527 aggregate, 8, 444, 558 film boiling, 163, 528, 530 aggregation, 240, 560 flow boiling, 527, 532 alternating current, 397 flow regimes, 531 Amontons’ law of sliding friction, 138, 139 heat flux regimes, 527 angular momentum balance, 142 nucleate boiling, 528–530, 532, 540 anisokinetic sampling, 346 pool boiling, 527, 532 annular flow, 448, 482, 514, 532 sub-cooled boiling, 527 APF. See agglomerate particulate fluidization boiling heat transfer, 527, 532, 540 arbitrary Lagrangian-Eulerian technique, 275 Boltzmann equation, 62, 262, 294 Archimedes number, 131, 429 Boltzmann-Maxwell distribution, 296 arithmetic mean diameter, 330 bounce back scheme, 297, 298 Arrhenius law, 563 boundary conditions atomization, 534, 535 charged surface, 136 atomizers, 535, 540 fluid-solid interface, 37 attrition, 10, 15, 126, 154, 218, 320, 507 immiscible fluids, 40 averaged transport equations, 192, 212, 217, 221 of interfacial mass transfer, 40, 103, 563 averages, 212 permeable interface, 58 ensemble average, 63 types of, 272 intrinsic average, 213, 214, 219 boundary-fitted mesh technique, 274 phase average, 213, 216 boundary-layer theory, 484 time average, 222 Bourger-Beer relation, 134 volume average, 213, 214 Boussinesq formulation, 48, 51, 223 volume-time average, 222 Boussinesq history integral force. See Basset force averaging theorems, 212–216 Boussinesq’s gradient approach. See Boussinesq formulation baffles, 425, 551 Bragg cell, 326 Bagnold friction law, 62 breakage, 240, 242, 457, 560 Bagnold number, 61 Brinkman equation, 32, 55, 58–60 ball probe method, 346, 358 brittle erosion, 508, 509 Basset force, 19, 81, 83, 90 Brownian diffusion, 391, 393 © in this web service Cambridge University Press www.cambridge.org Cambridge University Press 978-1-108-47374-3 — Dynamics of Multiphase Flows Chao Zhu , Liang-Shih Fan , Zhao Yu Index More Information Index 585 Brownian force, 199, 200, 414 chemical absorption, 526 Brownian motion, 178, 198, 230, 390, 399, 414 combustion, 526, 561–566 bubble column, 3, 306, 452, 457 polymerization, 526 gas-liquid, 248, 424, 458 CHF. See critical heat flux gas-liquid-solid, 424 choking, 447, 451 reactors, 549, 552 churn flow, 482 regimes, 458 churn-turbulent regime, 458 slurry, 10, 363, 424, 458, 552 circulating fluidized bed, 21, 446–452, 551 vortical-spiral flow structure, 459 compoents, 447 bubble condensing, 567 flow modeling, 451 bubble formation, 452–454, 527 flow regimes, 447 bubble-induced turbulence, 245, 248–249, 571, flow structure, 449 572 pressure balance, 463 bubbles clarification, in slurry separation, 379 acceleration, 19 Clausius-Clapeyron equation, 104 breakup, 434, 457 Clausius-Mossotti factor, 404–406 coalescence, 456–459 cluster interactions, 457, 533 bubbles, 459 motion, 432–434, 456, 567 formation and instability, 22, 447 bubbling velocity, 432 mass transfer, 134 bubbling, 107, 455, 456 clustering, 23, 238 stability, 432 coalescence, 155–157 wake, 433, 456 bubbles, 242, 434, 456 bubbling, 452 drainage time, 155 bubbling flows, 452 efficiency, 155 bubbling fluidization, 426, 432, 438 of fluid particles, 155–156 Buckingham Pi-theorem, 484 coefficient of restitution, 145, 183 buoyancy force, 19, 159, 454, 495 collection efficiency, 383 Burgers viscous vortex model, 385 collection mechanisms, 391 Burke-Plummer’s equation, 56 cyclone, 25, 387, 407 electrostatic precipitator, 401, 412 Cahn-Hilliard equation, 284 fractional, 407 cake filtration, 390, 396 multi-stage collector, 328 capacitance number, 452 of a fiber, 391–394 capacitance transducers, 334 of a fiber, size-averaged, 395 capillary force, 148–150 of a filter, 396, 410 Capillary number, 109 of a filter, overall, 395, 407–410 capillary tubes, 56 of a granular particle, 394 carried mass, 4, 19, 81, 83, 90, See added mass particle size distribution, 360 cascade impaction, 324 collision cascade impactors, 324, 378, 382 bubble-particle, 454, 457 catalytic cracking, 553 critical normal collision velocity, 145 cavitation, 527 droplet-droplet, 152 central differencing scheme, 266, 267 droplet-particle, 541 centrifugal force, 5, 377, 381, 385, 438, 506 droplet-surface, 150, 163 centrifugal sedimentation, 324 frequency, 155, 240 centrifugal separation, 4 head-on, 10 CFB. See circulating fluidized bed Hertzian, 144 CFD. See computational fluid dynamics non-equilibrium, 22 channeling, 428, 443 normal, 140–142, 145 charge generation, 560 oblique and rotational, 142–144 charge measurement, 358 particle-droplet, 7 charge transfer, 15, 147 particle-particle, 63 charge-induced electric field, 195 particle-wall, 5, 144, 477 charging probability, 400 collisional force, 107, 140, 141 chemical reactions, 15, 81, 526 collisional stress of solids, 32 © in this web service Cambridge University Press www.cambridge.org Cambridge University Press 978-1-108-47374-3 — Dynamics of Multiphase Flows Chao Zhu , Liang-Shih Fan , Zhao Yu Index More Information 586 Index combustion, 6, 561–566 covariance, 222–226, 230, 231, 342 coal particle, 564 creeping flow, 43 droplet, 562 critical heat flux, 528, 530, 532 compressibility cross-correlation function, 349 bulk volume, 33 cross-correlation measurements, 349 flow, 41, 81 cross-correlation method, 348–350 thermodynamic, 41 cumulative particle size distribution, 323 computational fluid dynamics, 41, 182, 261 Cunningham slip, 81, 88, 392 computer aided design, 263 cut-off size, 406 condensation, 242, 481, 560, 567 cyclone, 388, 406 condensing bubble, 567 impactor, 324 confocal microscopy, 318 multi-stage collector, 328 conformal mesh methods, 273–276 cyclone, 4, 5, 14, 380, 381, 447 conservation equation collection efficiency, 25, 406–407 general form, 35 flow modeling, 385–388 constitutive relations particle trajectory, 25 fluid-solid flows, 238 tangential-inlet, 4 kinetic theory of granular flow, 31–67 cyclone separation mechanism, 385 multi-fluid, 226, 229–234 cyclone separator, 345, 386, 406, 554 turbulent flows, 48 viscous fluid, 33–34 d2-law, 82, 104, 116, 545 contact angle, 39, 149 Dalton’s law, 100 contact theory, 136, 145 damping coefficient, 186, 189, 190 contact time Darcy’s equation. See Darcy’s law inter-particle, 146, 188 Darcy’s law, 32, 55, 58, 390 particle-fluid, 13, 98 DC. See direct current continuity equation DeBroucker’s mean diameter, 330 fluid without phase change, 36 Debye shielding distance, 399 overall of all phases, 292 deconvolution, 328 stratified flow, 499 DEM. See discrete element method volume-averaged, 217 dense phase transport, 22, 126, 467 volume-time averaged, 223 dense-phase fluidization, 429–437, 448, 468 continuous-discrete phase coupling, 287 DEP. See dielectrophoresis continuum modeling. See Eulerian-Eulerian deposition velocity, 485 modeling depth filtration, 390 flow in porous media, 55–60 deterministic trajectory model, 176–177, 253 kinetic theory of granular flow, 60–68 Deutsch equation, 402 multiphase flows, 212–237 dielectric particle, 94, 177, 402–405 viscous fluid flow, 55, 234 dielectrophoresis, 95, 402 continuum-discrete model, 173, 262, See dielectrophoretic force, 94, 95, 397 Eulerian-Lagrangian modeling differencing schemes, 266 convection differential settling method, 379 effect on evaporation, 104 diffraction, 132, 318, 320 heat transfer, 99, 131, 194 diffuse interface method, 283 mass transfer, 135 diffusion charging, 399 phase motion, 493 diffusion equation, 545 volume fraction in VOF, 280 diffusive flux, 36, 223, 267, 545 cooling tower, 6 diffusive transport coefficient, 223 core-annular pipe flow, 496 dilute transport, 18, 426, 447, 495–497, 544 Coriolis force, 96, 505 dimensional analysis, 49, 50, 156 corona charging, 398, 399 direct current, 397 corona-charging-ball probe method, 348 direct numerical simulation, 46, 53, 200, 239, 273, corona-discharging method, 355–356 543 Coulomb force, 113, 397, 400 discrete element method, 17, 182–191, 568 Coulomb’s law, 135 hard-sphere model, 182–185 Coulter counting, 318 soft-sphere model, 185–191 © in this web service Cambridge University Press www.cambridge.org Cambridge University Press 978-1-108-47374-3 — Dynamics of Multiphase Flows Chao Zhu , Liang-Shih Fan , Zhao Yu Index More Information Index 587 discrete phase, 126, 172, 217 scanning, 319 discretization schemes, 266–267 transmission, 319 disengagement method, 364 electro-osmotic flow, 71 dispersed bubble flow, 481 electrophoresis, 107, 173 dissipation function, 36 electrostatic precipitation, 13, 378, 397–402 dissipation rate electrostatic precipitator, 13, 397, 400, 412 heat, 37 elongated bubble flow, 481 specific kientic energy, 199 elutriation, 435 sub-grid energy, 54 elutriators, 378 turbulent kinetic energy, 45, 49 emulsion, 426, 432–434, 446 DNS. See direct numerical simulation energy equation Doppler effect, 325 enthalpy, 37, 220 Doppler frequency
Recommended publications
  • Collisional Granular Flows with and Without Gas Interactions in Microgravity
    COLLISIONAL GRANULAR FLOWS WITH AND WITHOUT GAS INTERACTIONS IN MICROGRAVITY A Dissertation Presented to the Faculty of the Graduate School of Cornell University in Partial Ful¯llment of the Requirements for the Degree of Doctor of Philosophy by Haitao Xu August 2003 c 2003 Haitao Xu ° ALL RIGHTS RESERVED COLLISIONAL GRANULAR FLOWS WITH AND WITHOUT GAS INTERACTIONS IN MICROGRAVITY Haitao Xu, Ph.D. Cornell University 2003 We studied flows of agitated spherical grains in a gas. When the grains have large enough inertia and when collisions constitute the dominant mechanism for momentum transfer among them, the particle velocity distribution is determined by collisional rather than by hydrodynamic interactions, and the granular flow is governed by equations derived from the kinetic theory. To solve these equations, we determined boundary conditions for agitated grains at solid walls of practical interest by considering the change of momentum and fluctuation energy of the grains in collisions with the wall. Using these condi- tions, solutions of the governing equations captured granular flows in microgravity experiments and in event-driven simulations. We extended the theory to gas-particle flows with moderately large grain in- ertia, in which the viscous gas introduces an additional dissipation mechanism of particle fluctuation energy. When there is also a mean relative velocity between the gas and the particles, the gas gives rise to particle fluctuation energy and to mean drag. Solutions of the resulting equations compared well with Lattice- Boltzmann simulations at large to moderate Stokes numbers. However, theoretical predictions deviated from simulations at small Stokes number or at large particle Reynolds number.
    [Show full text]
  • Two-Phase Modeling of Granular Sediment for Sheet Flows and Scour
    TWO-PHASE MODELING OF GRANULAR SEDIMENT FOR SHEET FLOWS AND SCOUR. A Dissertation Presented to the Faculty of the Graduate School of Cornell University in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy by Laurent Olivier Amoudry January 2008 c 2008 Laurent Olivier Amoudry ALL RIGHTS RESERVED TWO-PHASE MODELING OF GRANULAR SEDIMENT FOR SHEET FLOWS AND SCOUR. Laurent Olivier Amoudry, Ph.D. Cornell University 2008 Even though sediment transport has been studied extensively in the past decades, not all physical processes involved are yet well understood and repre- sented. This results in a modeling deficiency in that few models include complete and detailed descriptions of the necessary physical processes and in that mod- els that do usually focus on the specific case of sheet flows. We seek to address this modeling issue by developing a model that would describe appropriately the physics and would not only focus on sheet flows. To that end, we employ a two-phase approach, for which concentration- weighted averaged equations of motion are solved for a sediment and a fluid phase. The two phases are assumed to only interact through drag forces. The correlations between fluctuating quantities are modeled using the turbulent viscosity and the gradient diffusion hypotheses. The fluid turbulent stresses are calculated using a modified k−ε model that accounts for the two-way particle-turbulence interaction, and the sediment stresses are calculated using a collisional granular flow theory. This approach is used to study three different problems: dilute flow modeling, sheet flows and scouring. In dilute models sediment stresses are neglected.
    [Show full text]
  • TWO-FLUID MODELLING of HETEROGENEOUS COARSE PARTICLE SLURRY FLOWS a Thesis Submitted to the College of Graduate Studies and Rese
    TWO-FLUID MODELLING OF HETEROGENEOUS COARSE PARTICLE SLURRY FLOWS A Thesis Submitted to the College of Graduate Studies and Research in Partial Fulfilment of the Requirements for the Degree of Doctor of Philosophy in the Department of Mechanical Engineering University of Saskatchewan Saskatoon, Saskatchewan by Franklin Norvisi Krampa © Copyright Franklin Norvisi Krampa, January 2009. All rights reserved. Library and Archives Bibliothèque et Canada Archives Canada Published Heritage Direction du Branch Patrimoine de l’édition 395 Wellington Street 395, rue Wellington Ottawa ON K1A 0N4 Ottawa ON K1A 0N4 Canada Canada Your file Votre référence ISBN: 978-0-494-62631-3 Our file Notre référence ISBN: 978-0-494-62631-3 NOTICE: AVIS: The author has granted a non- L’auteur a accordé une licence non exclusive exclusive license allowing Library and permettant à la Bibliothèque et Archives Archives Canada to reproduce, Canada de reproduire, publier, archiver, publish, archive, preserve, conserve, sauvegarder, conserver, transmettre au public communicate to the public by par télécommunication ou par l’Internet, prêter, telecommunication or on the Internet, distribuer et vendre des thèses partout dans le loan, distribute and sell theses monde, à des fins commerciales ou autres, sur worldwide, for commercial or non- support microforme, papier, électronique et/ou commercial purposes, in microform, autres formats. paper, electronic and/or any other formats. The author retains copyright L’auteur conserve la propriété du droit d’auteur ownership and moral rights in this et des droits moraux qui protège cette thèse. Ni thesis. Neither the thesis nor la thèse ni des extraits substantiels de celle-ci substantial extracts from it may be ne doivent être imprimés ou autrement printed or otherwise reproduced reproduits sans son autorisation.
    [Show full text]
  • Shear Thickening in Concentrated Suspensions: Phenomenology, Mechanisms, and Relations to Jamming
    Shear thickening in concentrated suspensions: phenomenology, mechanisms, and relations to jamming Eric Brown Department of Mechanical Engineering and Materials Science, Yale University, New Haven CT 06520 Heinrich M. Jaeger James Franck Institute, The University of Chicago, Chicago, IL 60637 (Dated: November 1, 2013) Shear thickening is a type of non-Newtonian behavior in which the stress required to shear a fluid increases faster than linearly with shear rate. Many concentrated suspensions of particles exhibit an especially dramatic version, known as Discontinuous Shear Thickening (DST), in which the stress suddenly jumps with increasing shear rate and produces solid-like behavior. The best known example of such counter-intuitive response to applied stresses occurs in mixtures of cornstarch in water. Over the last several years, this shear-induced solid-like behavior together with a variety of other unusual fluid phenomena has generated considerable interest in the physics of densely packed suspensions. In this review, we discuss the common physical properties of systems exhibiting shear thickening, and different mechanisms and models proposed to describe it. We then suggest how these mechanisms may be related and generalized, and propose a general phase diagram for shear thickening systems. We also discuss how recent work has related the physics of shear thickening to that of granular materials and jammed systems. Since DST is described by models that require only simple generic interactions between particles, we outline the broader context of other concentrated many-particle systems such as foams and emulsions, and explain why DST is restricted to the parameter regime of hard-particle suspensions. Finally, we discuss some of the outstanding problems and emerging opportunities.
    [Show full text]
  • Suspensions of Finite-Size Rigid Particles in Laminar and Turbulent
    Suspensions of finite-size rigid particles in laminar and turbulentflows by Walter Fornari November 2017 Technical Reports Royal Institute of Technology Department of Mechanics SE-100 44 Stockholm, Sweden Akademisk avhandling som med tillst˚andav Kungliga Tekniska H¨ogskolan i Stockholm framl¨agges till offentlig granskning f¨or avl¨aggande av teknologie doctorsexamenfredagen den 15 December 2017 kl 10:15 i sal D3, Kungliga Tekniska H¨ogskolan, Lindstedtsv¨agen 5, Stockholm. TRITA-MEK Technical report 2017:14 ISSN 0348-467X ISRN KTH/MEK/TR-17/14-SE ISBN 978-91-7729-607-2 Cover: Suspension offinite-size rigid spheres in homogeneous isotropic turbulence. c Walter Fornari 2017 � Universitetsservice US–AB, Stockholm 2017 “Considerate la vostra semenza: fatti non foste a viver come bruti, ma per seguir virtute e canoscenza.” Dante Alighieri, Divina Commedia, Inferno, Canto XXVI Suspensions offinite-size rigid particles in laminar and tur- bulentflows Walter Fornari Linn´eFLOW Centre, KTH Mechanics, Royal Institute of Technology SE-100 44 Stockholm, Sweden Abstract Dispersed multiphaseflows occur in many biological, engineering and geophysical applications such asfluidized beds, soot particle dispersion and pyroclastic flows. Understanding the behavior of suspensions is a very difficult task. Indeed particles may differ in size, shape, density and stiffness, their concentration varies from one case to another, and the carrierfluid may be quiescent or turbulent. When turbulentflows are considered, the problem is further complicated by the interactions between particles and eddies of different size, ranging from the smallest dissipative scales up to the largest integral scales. Most of the investigations on this topic have dealt with heavy small particles (typically smaller than the dissipative scale) and in the dilute regime.
    [Show full text]
  • On Dimensionless Numbers
    chemical engineering research and design 8 6 (2008) 835–868 Contents lists available at ScienceDirect Chemical Engineering Research and Design journal homepage: www.elsevier.com/locate/cherd Review On dimensionless numbers M.C. Ruzicka ∗ Department of Multiphase Reactors, Institute of Chemical Process Fundamentals, Czech Academy of Sciences, Rozvojova 135, 16502 Prague, Czech Republic This contribution is dedicated to Kamil Admiral´ Wichterle, a professor of chemical engineering, who admitted to feel a bit lost in the jungle of the dimensionless numbers, in our seminar at “Za Plıhalovic´ ohradou” abstract The goal is to provide a little review on dimensionless numbers, commonly encountered in chemical engineering. Both their sources are considered: dimensional analysis and scaling of governing equations with boundary con- ditions. The numbers produced by scaling of equation are presented for transport of momentum, heat and mass. Momentum transport is considered in both single-phase and multi-phase flows. The numbers obtained are assigned the physical meaning, and their mutual relations are highlighted. Certain drawbacks of building correlations based on dimensionless numbers are pointed out. © 2008 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved. Keywords: Dimensionless numbers; Dimensional analysis; Scaling of equations; Scaling of boundary conditions; Single-phase flow; Multi-phase flow; Correlations Contents 1. Introduction .................................................................................................................
    [Show full text]
  • Acoustic Absorption, 265 Acoustic Attenuation, 226, 252, 275–279
    Index acoustic absorption, 265 cavitating pump dynamics, 378–382 acoustic attenuation, 226, 252, 275–279 cavitation, 128 acoustic damping, 275–279 bubble cloud, 135 acoustic impedance, 223 bubble collapse, 131 acoustic impulse, 145 bubble shape, 133, 139–142 acoustic pressure, 143 damage, 134, 136–143 added mass matrix, 62 event rate, 147 annular flow, 206 events, 139, 147 instability, 194–195 inception, 128 atomizing nozzle, 292 inception number, 129 attached cavitation, 142 luminescence, 149 tails, 142 noise, 142–148 auto-oscillation, 354 nuclei, 129 avalanches, 308 number, 128 averaging, 27–28, 47–48, 50, 343 patch, 142 scaling, 148 Bagnold number, 326 stable acoustic, 124 barotropic relation, 221, 231–233 transient acoustic, 124 Basset term, 72, 75 cavitation surge, 354–355, 378, 379 binary collision time, 311 frequency, 355 Bjerknes forces, 61, 95–124 onset, 354 Blake critical pressure, 112 charge separation, 183 Blake critical radius, 112 choked flow, 236, 284, 335, 368 boiling, 150–160 chugging, 356–359 vertical surfaces, 157–160 Clausius-Clapeyron equation, 104 boiling crisis, 153, 338 cloud natural frequency, 262 Brownian motion, 61 coefficient of restitution, 310, 327 bubble component acceleration, 73–78 characteristic, 345 cloud, 135, 259–266 resistance, 346 collapse, 131–149 compressibility, 374 damping, 124, 250 compressor surge, 349, 355 deformation, 86–91 concentration waves, 173, 351–353, 365 fission, 141 condensation, 160–162 migration, 96–99 condensation oscillations, 356–359 natural frequency, 120–123, 249, 258 condensation
    [Show full text]
  • Experimental Studies of Large Particles in Newtonian and Non-Newtonian Fluids Sagar Zade
    Experimental studies of large particles in Newtonian and non-Newtonian fluids by Sagar Zade September 2019 Technical Reports Royal Institute of Technology Department of Mechanics SE-100 44 Stockholm, Sweden Akademisk avhandling som med tillst˚andav Kungliga Tekniska H¨ogskolan i Stockholm framl¨agges till offentlig granskning f¨or avl¨aggande av teknologie doktorsexamen torsdag den 26 September 2019 kl 10:15 i Kollegiesalen (Room nr: 4301), Kungliga Tekniska H¨ogskolan, Brinellv¨agen 8, KTH-huset. TRITA NR: 2019;39 ISBN: 978-91-7873-278-4 ©Sagar Zade 2019 Universitetsservice US{AB, Stockholm 2019 To all teachers Experimental studies of large particles in Newtonian and non-Newtonian fluids Sagar Zade Linn´eFLOW Centre, KTH Mechanics, Royal Institute of Technology SE-100 44 Stockholm, Sweden Abstract In everyday human life, laminar flow is arguably an exception whereas turbulent flow is the norm. Yet, the former has been much better understood, naturally since laminar flow renders itself to treatment in a relatively easier fashion compared to turbulence with its chaotic dynamics across multiple scales in space and time. A parallel analogy in terms of sophistication of dynamics can be drawn between single phase and multiphase flows; the latter being the norm yet poorly understood due to numerous complexities arising on account of the huge parameter space involved. It is also remarkable that numerical studies are more prevalent in this field and there is a dearth of experimental results, which are important for both validation purposes and as a beacon to navigate research in practically relevant directions. This work has emerged to address the above issues.
    [Show full text]
  • Introduction
    1 Chapter 1 Introduction Granular materials and their suspension in liquids are prevalent in a wide range of natural and man-made processes. These include the industrial handling of seeds and slurries, clogging of drilling wells, and geological phenomena such as landslides and debris flows. Because of the complexity of having more than one phase (the solid and the fluid one), most of the understanding of how these materials flow is based on empirical observations, hampering, for example, the design of efficient transport of a suspension of solids in a fluid medium. Therefore the goal of this research is to help develop constitutive models that predict how liquid-solid mixtures behave when sheared as a function of various physical parameters, using carefully controlled experiments to validate and refine such models. The work presented in this thesis focuses on liquid-solid mixtures, and unlike the mechanics of dry granular material flows which are dominated by collisions and friction, the mechanics for these mixtures involve the interaction between the solid particles, the inertial effects from both liquid and solid phase, and viscous effects of the liquid. In particular, the effects of particle concentration and the density ratio between the two phases are studied under shear conditions where particle collisions might become important. A review of previous rheological experiments and the key parameters that govern the behavior of liquid-solid mixtures is presented. 1.1 Rheology of non-inertial suspensions There is an extensive work done in the rheology of suspensions; however, most of these studies cover mixtures with low Reynolds number (Re) (from 10−6 to 10−3), where Re is defined as Re = ργd˙ 2/µ, ρ and µ are the density and dynamic viscosity of the suspending liquid,γ ˙ , is the shear rate and d is the particle diameter.
    [Show full text]
  • SASO-ISO-80000-11-2020-E.Pdf
    SASO ISO 80000-11:2020 ISO 80000-11:2019 Quantities and units - Part 11: Characteristic numbers ICS 01.060 Saudi Standards, Metrology and Quality Org (SASO) ----------------------------------------------------------------------------------------------------------- this document is a draft saudi standard circulated for comment. it is, therefore subject to change and may not be referred to as a saudi standard until approved by the boardDRAFT of directors. Foreword The Saudi Standards ,Metrology and Quality Organization (SASO)has adopted the International standard No. ISO 80000-11:2019 “Quantities and units — Part 11: Characteristic numbers” issued by (ISO). The text of this international standard has been translated into Arabic so as to be approved as a Saudi standard. DRAFT DRAFT SAUDI STANDADR SASO ISO 80000-11: 2020 Introduction Characteristic numbers are physical quantities of unit one, although commonly and erroneously called “dimensionless” quantities. They are used in the studies of natural and technical processes, and (can) present information about the behaviour of the process, or reveal similarities between different processes. Characteristic numbers often are described as ratios of forces in equilibrium; in some cases, however, they are ratios of energy or work, although noted as forces in the literature; sometimes they are the ratio of characteristic times. Characteristic numbers can be defined by the same equation but carry different names if they are concerned with different kinds of processes. Characteristic numbers can be expressed as products or fractions of other characteristic numbers if these are valid for the same kind of process. So, the clauses in this document are arranged according to some groups of processes. As the amount of characteristic numbers is tremendous, and their use in technology and science is not uniform, only a small amount of them is given in this document, where their inclusion depends on their common use.
    [Show full text]
  • Which Effective Viscosity?
    CORE Metadata, citation and similar papers at core.ac.uk Provided by Bournemouth University Research Online Mineralogical Magazine, April 2009, Vol. 73(2), pp. 167–191 Which effective viscosity? N. PETFORD* School of Conservation Sciences, Bournemouth University, Poole, Dorset BH12 5BB, UK [Received 7 January 2009; Accepted 21 May 2009)] ABSTRACT Magmas undergoing shear are prime examples of flows that involve the transport of solids and gases by a separate (silicate melt) carrier phase. Such flows are called multiphase, and have attracted much attention due to their important range of engineering applications. Where the volume fraction of the dispersed phase (crystals) is large, the influence of particles on the fluid motion becomes significant and must be taken into account in any explanation of the bulk behaviour of the mixture. For congested magma deforming well in excess of the dilute limit (particle concentrations >40% by volume), sudden changes in the effective or relative viscosity can be expected. The picture is complicated further by the fact that the melt phase is temperature- and shear-rate-dependent. In the absence of a constitutive law for the flow of congested magma under an applied force, it is far from clear which of the many hundreds of empirical formulae devised to predict the rheology of suspensions as the particle fraction increases with time are best suited. Some of the more commonly used expressions in geology and engineering are reviewed with an aim to home in on those variables key to an improved understanding of magma rheology. These include a temperature, compositional and shear-rate dependency of viscosity of the melt phase with the shear-rate dependency of the crystal (particle) packing arrangement.
    [Show full text]
  • Notebook Introduction to Fluid Rheology
    ÉC O LE P O L Y TE C HN IQU E FÉ DÉR A LE D E L AU S ANN E Christophe Ancey Laboratoire hydraulique environnementale (LHE) École Polytechnique Fédérale de Lausanne Écublens CH-1015 Lausanne Notebook Introduction to Fluid Rheology version 1.0 of 4th July 2005 2 C. Ancey, EPFL, ENAC/ICARE/LHE, Ecublens, CH-1015 Lausanne, Suisse christophe.ancey@epfl.ch, lhe.epfl.ch Introduction to Fluid Rheology / C. Ancey Ce travail est soumis aux droits d’auteurs. Tous les droits sont réservés ; toute copie, partielle ou complète, doit faire l’objet d’une autorisation de l’auteur. La gestion typographique a été réalisée à l’aide du package french.sty de Bernard Gaulle. Remerciements : à Sébastien Wiederseiner et Martin Rentschler pour la relecture du manuscrit. 3 « Le physicien ne peut demander à l’analyste de lui révéler une vérité nouvelle ; tout au plus celui-ci pourrait-il l’aider à la pressentir. Il y a longtemps que personne ne songe plus à devancer l’expérience, ou à construire le monde de toutes pièces sur quelques hypothèses hâtives. De toutes ces constructions où l’on se complaisait encore naïvement il y a un siècle, il ne reste aujourd’hui plus que des ruines. Toutes les lois sont donc tirées de l’expérience, mais pour les énoncer, il faut une langue spéciale ; le langage ordinaire est trop pauvre, elle est d’ailleurs trop vague, pour exprimer des rapports si délicats, si riches et si précis. Voilà donc une première raison pour laquelle le physicien ne peut se passer des mathématiques ; elles lui fournissent la seule langue qu’il puisse parler.» Henri Poincaré, in La Valeur de la Science 4 TABLE OF CONTENTS 5 Table of contents 1 Rheometry 17 1.1 How does a rheometer operate? .
    [Show full text]