Bibliografie tematiche / Mechanical physics - fluid

Letteratura scientifica selezionata sul tema "Mechanical physics - fluid"

Autore: Grafiati
Pubblicato: 26 luglio 2024

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Articoli di riviste sul tema "Mechanical physics - fluid"

1

Fedina, Olga V., Arthur R. Zakinyan e Irina M. Agibova. "Design of science laboratory sessions with magnetic fluids". International Journal of Mechanical Engineering Education 45, n. 4 (26 maggio 2017): 349–59. http://dx.doi.org/10.1177/0306419017708644.

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Application of new achievements in science and technology to the physics laboratory sessions can ensure the advancement of physics education. One particular example of the technologies giving new opportunities in the design of physics laboratory works is the magnetic fluid. We describe the laboratory works within the scope of the general physic course for the undergraduate students. Principal feature of the laboratories presented is the use of magnetic fluids. It makes possible to design some creative laboratory works, which can help to develop skills in performing scientific experiments and to increase the understanding of the physical concepts. The sample consists of 120 third-grade university students from the Department of General and Theoretical Physics in the North Caucasus Federal University in Stavropol, Russia. These laboratories arouse students’ interest and contribute to the achievement of high quality of learning outcomes. We also show that such laboratories engage students’ interest in the scientific research work.
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Yue, Peng, Jinghui Zhang e Sibei Wei. "Mathematical Model for Excited State Fluid Dynamics". Journal of Physics: Conference Series 2650, n. 1 (1 novembre 2023): 012031. http://dx.doi.org/10.1088/1742-6596/2650/1/012031.

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Abstract The rational mechanic’s research method is synthesized with the help of mathematical means such as generalized function analysis and tensor analysis. The basic definition of the fluctuation velocity generation is based on phenomenological physics in this article. The basic control equations of general excited state fluid dynamics applicable to the flowfield are obtained based on the basic principles of quantum mechanical superposition states. The simplified basic equations of the excited State are finally obtained through time and space discretization. The basic theory of excited state fluid dynamics is established, providing new ideas for the innovation and application of flow control, fluid mechanical engineering design, and other aspects of research work.
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Saravanakumar, Sri Manikandan, e Paul-Vahe Cicek. "Microfluidic Mixing: A Physics-Oriented Review". Micromachines 14, n. 10 (25 settembre 2023): 1827. http://dx.doi.org/10.3390/mi14101827.

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This comprehensive review paper focuses on the intricate physics of microfluidics and their application in micromixing techniques. Various methods for enhancing mixing in microchannels are explored, with a keen emphasis on the underlying fluid dynamics principles. Geometrical micromixers employ complex channel designs to induce fluid–fluid interface distortions, yielding efficient mixing while retaining manufacturing simplicity. These methods synergize effectively with external techniques, showcasing promising potential. Electrohydrodynamics harnesses electrokinetic phenomena like electroosmosis, electrophoresis, and electrothermal effects. These methods offer dynamic control over mixing parameters via applied voltage, frequency, and electrode positioning, although power consumption and heating can be drawbacks. Acoustofluidics leverages acoustic waves to drive microstreaming, offering localized yet far-reaching effects. Magnetohydrodynamics, though limited in applicability to certain fluids, showcases potential by utilizing magnetic fields to propel mixing. Selecting an approach hinges on trade-offs among complexity, efficiency, and compatibility with fluid properties. Understanding the physics of fluid behavior and rationalizing these techniques aids in tailoring the most suitable micromixing solution. In a rapidly advancing field, this paper provides a consolidated understanding of these techniques, facilitating the informed choice of approach for specific microfluidic mixing needs.
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Elsaady, Wael, S. Olutunde Oyadiji e Adel Nasser. "A review on multi-physics numerical modelling in different applications of magnetorheological fluids". Journal of Intelligent Material Systems and Structures 31, n. 16 (7 luglio 2020): 1855–97. http://dx.doi.org/10.1177/1045389x20935632.

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Magnetorheological fluids involve multi-physics phenomena which are manifested by interactions between structural mechanics, electromagnetism and rheological fluid flow. In comparison with analytical models, numerical models employed for magnetorheological fluid applications are thought to be more advantageous, as they can predict more phenomena, more parameters of design, and involve fewer model assumptions. On that basis, the state-of-the-art numerical methods that investigate the multi-physics behaviour of magnetorheological fluids in different applications are reviewed in this article. Theories, characteristics, limitations and considerations employed in numerical models are discussed. Modelling of magnetic field has been found to be rather an uncomplicated affair in comparison to modelling of fluid flow field which is rather complicated. This is because, the former involves essentially one phenomenon/mechanism, whereas the latter involves a plethora of phenomena/mechanisms such as laminar versus turbulent rheological flow, incompressible versus compressible flow, and single- versus two-phase flow. Moreover, some models are shown to be still incapable of predicting the rheological nonlinear behaviour of magnetorheological fluids although they can predict the dynamic characteristics of the system.
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Papanastasiou, Tasos C., Dionissios G. Kiriakidis e Theodore G. Nikoleris. "Extrudate Swelling: Physics, Models, and Computations". Applied Mechanics Reviews 48, n. 10 (1 ottobre 1995): 689–95. http://dx.doi.org/10.1115/1.3005050.

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Viscous, viscoelastic, or elastic normal stresses are superimposed to pressure within flowing fluids. These stresses act normal to the boundaries of the flow that may deform depending on their modulus or viscosity. At absolutely rigid boundaries of infinite modulus of elasticity any boundary deformation and therefore any fluid expansion or swelling is surpressed (eg, flow in rigid pipes, annuli, channels). Elastic boundaries (eg, flow in veins and arteries, flow by membranes, around inflating/deflating balloons) deform under the action of normal stresses, allowing expansion or swelling of fluid. The same mechanism prevails in lubrication, where pressure and superimposed normal viscoelastic stresses keep surfaces in relative motion apart, with simultaneous increase in load capacity. Viscous boundaries (eg, liquid jet in air or in immiscible liquid, slow extrusion of viscoelastic liquids from dies, expanding/collapsing air-bubbles or liquid-droplets) are displaced by flowing adjacent immiscible fluids, allowing swelling or imposing contraction depending on relative rheological characteristics. Thus, the kind of swelling examined here is independent of density, ie, incompressible, and is due to the action of normal stresses against the boundary that is imposed either by adjacent deformable obstacles or else by surface tension. The resulting swelling is dynamic (ie, it initiates, changes and ceases with the flow) and can be made permanent by solidification, crystallization or glassification. The most profound form of incompressible swelling is the extrude swelling that controls the ultimate shape of extruded parts. Incompressible swelling is enhanced by the ability of macromolecules to deform and recover (eg, viscoelastic) and by the design of flow conduits to impose sharp transitions of deformation modes (eg, singular exit flows). The same swelling is reduced by the ability of molecules (or fibers in fiber-suspensions) to align with the flow streamines, as well as any tendency of solid-like structure formulation (eg, viscoplastic).
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Serrano, Jean Carlos, Satish Kumar Gupta, Roger D. Kamm e Ming Guo. "In Pursuit of Designing Multicellular Engineered Living Systems: A Fluid Mechanical Perspective". Annual Review of Fluid Mechanics 53, n. 1 (5 gennaio 2021): 411–37. http://dx.doi.org/10.1146/annurev-fluid-072220-013845.

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From intracellular protein signaling to embryonic symmetry-breaking, fluid transport ubiquitously drives biological events in living systems. We provide an overview of the fundamental fluid mechanics and transport phenomena across a range of length scales in cellular systems, with emphasis on how cellular functions are influenced by fluid transport. We also highlight how understanding the physical basis of these fluid dynamic phenomena can be implemented to engineer increasingly complex multicellular systems that recapitulate tissue-level functions. Examples discussed include the manipulation of intracellular fluid volume to achieve cell differentiation/dedifferentiation and the use of microfluidic systems to control the spatial and temporal distribution of morphogens and fluid forces to generate vascularized organoids.
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ZHANG, CHENGYUAN, XIAOYAN LIU, DAOYING XI e QUANSHENG LIU. "AN ROCK-PHYSICS-BASED COMPLEX PORE-FLUID-DISTRIBUTION MODEL TO SEISMIC DYNAMICAL RESPONSE". International Journal of Modern Physics B 22, n. 09n11 (30 aprile 2008): 1437–42. http://dx.doi.org/10.1142/s021797920804689x.

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It is very important to know how the reservoir rock and its fluid properties are linked to seismic dynamic response. Literatures show that there are a variety of rock-physics models such as the most famous Biot-Gassmann equation aimed at the relationship between seismic velocity and liquid saturation. Most of these models make a fundamental assumption of one fluid phase or homogeneous phase within the pore volume. In this paper, we discuss possible seismic velocities change in a two immiscible pore fluids (i.e. water-gas) saturated reservoir with patchy saturation distribution. It is found that P-wave velocity of a reservoir rock with the same saturation but different pore fluid distribution exhibits noticeable variation and deviate overall from Gassmann's results. We use DEM theory to explain this phenomenon. It belongs to hybrid approach in rock-physics modeling and can handle complex pore-fluid-distribution cases. Based on the modeling study, we found that various fluid-distribution models may significantly affect the modulus and P-wave velocity. The seismic reflection time, amplitude and phase characteristics may change with the choice of pore-fluid-distribution models. Relevant rock mechanical experiments indicate the same trend of seismic responses. It also be proven by seismic reservoir monitoring experiment (time lapse study) that incorrect conclusion may be drawn about the strong seismic reflection in pure Utsira Sand if the microscopic pore-fluid-distribution effects are not taken into account.
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Siagian, Mutiara. "PENGARUH PENGUASAAN HUKUM KEKEKALAN ENERGI MEKANIK TERHADAP HASIL BELAJAR FISIKA MATERI POKOK MEKANIKA FLUIDA DI KELAS XI SMA NEGERI PADANGSIDIMPUAN". JURNAL PhysEdu (PHYSICS EDUCATION) 5, n. 1 (31 marzo 2023): 22–28. http://dx.doi.org/10.37081/physedu.v5i1.4933.

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This study aimed to determine a general idea of mastering the law of conservation of mechanical energy and fluid mechanics, and then I see the influence of the law of conservation of mechanical energy mastery of the learning outcomes of the subject matter of physics of fluid mechanics in class XI of SMAN 8 Padangsidimpuan. The research was conducted using descriptive method.The population is all class XI student are 45 students. The sample is 45 students which are taken by total sampling technique. The data is collected by using test as an instrument. The writer uses statistic processes in analyzing data. They are descriptive analysis and inferential analysis by using the formula of “r” Product Moment and the formula of t test. After collecting the data, it is found the average of mastering the law of conservation of mechanical energy,can be categorized “pretty” .While the average value of the subject matter of physics learning outcomes of fluid mechanics 68.17 can be categorized “pretty”. The result of the analyzed data shows the score of ttest > ttable (2,0 > 1,67) . in other words, the score of ttest is bigger than ttable. So, the hypothesis is accepted. It means there is the influence of the law of conservation of mechanical energy mastery of the learning outcomes of the subject matter of physics of fluid mechanics in class XI of SMAN 8 Padangsidimpuan
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Deng, Wubing, e Igor B. Morozov. "Macroscopic mechanical properties of porous rock with one saturating fluid". GEOPHYSICS 84, n. 6 (1 novembre 2019): MR223—MR239. http://dx.doi.org/10.1190/geo2018-0602.1.

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Effective frequency-dependent moduli and [Formula: see text]-factors are broadly used for characterizing the behavior of earth media in laboratory and field seismic observations. However, such properties are wavemode- and experiment-dependent and are often incomplete and/or inaccurate for modeling realistic situations. For example, viscoelastic moduli for porous fluid-saturated rock are usually derived for primary waves, but they may not apply to cases in which secondary waves are important, such as reflections in finely layered poroelastic media or quasistatic pore-fluid flows in laboratory experiments. To obtain a model applicable to all cases, equations of mechanics should be used, and mechanical properties of the material must be identified. To reveal and measure such properties for fluid-saturated porous rock, we have developed a Biot-consistent model based on Lagrangian continuum mechanics. The model is “minimal,” purely macroscopic, and independent of the macrostructure or patterns of pore-fluid flows; thus, it could represent many existing wave-induced fluid-flow (WIFF) as well as non-WIFF models. Due to its mechanical definition, the model should be applicable to all rock-physics experiments (linear creep, pore flow, low-frequency, resonant, or ultrasonic), any waves in the field (primary, secondary, standing, surface, etc.) under arbitrary boundary conditions, and also finite-difference and finite-element numerical modeling. When based on this model, numerical simulations require no integral equations, fractional derivatives, memory variables, or additional kinetic equations. We further use the model to invert for detailed elastic and viscous properties of fluid-saturated Berea and Fontainebleau sandstones from recently published low-frequency laboratory experiments. All rock properties inferred in the model are time- and frequency-independent, comparable to other physical observations, and the model closely predicts the data. The model can be approximately pore-fluid independent, which allows performing rigorous fluid substitution with viscous pore fluids. As an illustration, P-wave velocity dispersion and attenuation in water-, oil-, and gas-saturated sandstone are simulated.
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Zhao, Yueqiang, Zhengming Wu e Weiwei Liu. "Statistical mechanical theory of fluid mixtures". Physica A: Statistical Mechanics and its Applications 393 (gennaio 2014): 62–75. http://dx.doi.org/10.1016/j.physa.2013.08.062.

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Tesi sul tema "Mechanical physics - fluid"

1

Newton, Michael James. "Experimental mechanical and fluid mechanical investigations of the brass instrument lip-reed and the human vocal folds". Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/3140.

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The mechanical properties of the lips are of crucial importance to the function of a brass instrument. The natural resonance modes must be able to usefully interact with the instrument air column in order to sustain oscillations. Mechanical frequency responses of human and arti cial lips used to play a brass instrument were measured using a high-speed digital video technique in an attempt to classify the true nature of the lipreed. The results revealed the presence of at least two lip modes that exhibited the characteristic outward-inward striking behaviour seen in many in vitro replica lip-reed measurements. The Q-values of the human lip resonances were considerably lower than those seen for the replica lips. Transverse mechanical response measurements were also performed on an in vitro lip-reed to investigate the coupling between the outward and inward striking modes. The two dimensional motion of the lips during full oscillations was investigated. It is shown that a computational four degree-of-freedom model would be required to fully simulate the observed mechanical motion. The uid behaviour downstream from an in vitro vocal fold model was investigated using particle image velocimetry (PIV). A `free jet' con guration with no downstream acoustical coupling was rst investigated. The measurements revealed an unsteady glottal jet ow, consisting of a high velocity jet core, a transitional region of high jet deceleration and a turbulent mixing region. The jet was consistently skewed at angles to the glottal centreline, and appeared to oscillate back and forth across the centreline during the glottal cycle. The behaviour of the jet core was investigated in detail. A temporal asymmetry was observed in the mean velocity across the jet core such that the highest jet velocities were encountered during the closing phase of the vocal folds. The overall jet behaviour also showed a strong turbulent asymmetry between the opening and closing phases. High levels of vorticity and turbulent motion encountered during the closing phase were associated with the deceleration of the jet. Three vocal fold con gurations that included static replicas of the ventricular bands were nally investigated with the aim of characterising the aerodynamic interaction between the ventricular bands and the vocal folds. A marked e ect on the glottal jet was observed for all con gurations. The most physically realistic con guration appeared to stabilise the glottal jet, leading to a reattachment of the jet to the ventricular bands and a subsequent secondary ow separation from the downstream end. The implications of the aerodynamic interaction is discussed, with particular note to its possible relevance to the lip-reed and mouthpiece interaction in brass playing.
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Dhruv, Akash. "A Multiphase Solver for High-Fidelity Phase-Change Simulations over Complex Geometries". Thesis, The George Washington University, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=28256871.

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Complex interactions between solid, liquid and gas occur in many practical engineering applications, and are often difficult to quantify experimentally. A few examples include boiling over solid heaters, solidification melt-dynamics in metal casting, and convective cooling of electronic components. With the availability of scalable computational tools, high-fidelity simulations can provide new insight into these phenomena and answer open questions. In the present work, a multiphase solver is presented which can simulate problems involving phase transition over complex geometries. The dynamics of liquid-gas interface are modeled using a level-set technique, which utilizes Ghost Fluid Method (GFM) to account for sharp jump in pressure, velocity, and temperature across the multiphase boundary. The fluid-solid interactions are modeled using an Immersed Boundary Method (IBM) which uses a Moving Least Squared (MLS) reconstruction to calculate fluid-flow around the solid, along with an additional GFM forcing to model its effect on pressure, temperature and Conjugate Heat Transfer (CHT). The resulting three dimensional solver is fully explicit in time and uses a fractional step method for Navier-Stokes, energy, and mass transfer equations. Validation and verification cases are presented to demonstrate the accuracy of the solver in comparison to experimental and analytical problems, and results of high fidelity pool boiling simulations in varying gravity environments are discussed in detail.
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Emmanuelli, Gustavo. "An Assessment of State Equations of Air for Modeling a Blast Load Simulator". Thesis, Mississippi State University, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=10979719.

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When an explosive detonates above ground, air is principally the only material involved in the transmission of shock waves that can result in damage. Hydrodynamic codes that simulate these explosions use equations of state (EOSs) for modeling the behavior of air at these high-pressure, high-velocity conditions. An investigation is made into the effect that the EOS selection for air has on the calculated overpressure-time waveforms of a blast event. Specifically, the ideal gas, Doan-Nickel, and SESAME EOSs in the SHAMRC code were used to reproduce experiments conducted at the Blast Load Simulator (BLS), a large-scale shock tube operated by the U.S. Army Engineer Research and Development Center, that consisted of subjecting an instrumented rigid box at three angles of orientation inside the BLS to a blast environment. Numerical comparisons were made against experimentally-derived confidence intervals using peak values and several error metrics, and an attempt was made to rank the EOS based on performance. Issues were noted with the duration of decay from maximum pressure to negative phase that resulted in a general underprediction of the integrated impulse regardless of EOS, while the largest errors were noted for gages on faces at 45 to 90 degrees from the initial flow direction. Although no significant differences were noticed in the pressure histories from different EOSs, the ideal gas consistently ranked last in terms of the error metrics considered and simultaneously required the least computing resources. Similarly, the Doan-Nickel EOS slightly performed better than SESAME while requiring additional wallclock time. The study showed that the Doan-Nickel and SESAME EOSs can produce blast signatures with less errors and more matches in peak pressure and impulse than the ideal gas EOS at the expense of more computational requirements.

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Faletra, Melissa Kathleen. "Segregation of Particles of Variable Size and Density in Falling Suspension Droplets". ScholarWorks @ UVM, 2014. http://scholarworks.uvm.edu/graddis/265.

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The problem of the falling under gravity suspension droplet was examined for cases where the droplet contains particles with different densities and different sizes. Cases examined include droplets composed of uniform-size particles with two different densities, of uniform-density particles of two different sizes, and of a distribution of particles of different densities. The study was conducted using both simulations based on Oseenlet particle interactions and laboratory experiments. It is observed that when the particles in the suspension droplet have different sizes and densities, an interesting segregation phenomenon occurs in which lighter/smaller particles are transported downward with the droplet and preferentially leave the droplet by entering into the droplet tail, whereas heavier/larger particles remain for longer periods of time in the droplet. When computations are performed with two particle densities or two particle sizes, a point is eventually reached where all of the lighter/smaller particles have been ejected from the droplet, and the droplet continues to fall with only the heavier/larger particles. A simple model explaining three stages of this segregation process is presented.
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Tourbier, Dietmar 1964. "Numerical investigation of transitional and turbulent compressible axisymmetric wakes". Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/282242.

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A numerical method has been developed for solving the complete compressible Navier-Stokes equations. The method is applicable for Direct Numerical Simulations (DNS) and Large-Eddy Simulations (LES) and was used here to study the evolution of three-dimensional disturbances in the laminar and turbulent near wake of axisymmetric bluff bodies with a blunt base in supersonic flows. The main objective of this research is to investigate the time dependent behavior of these disturbances and their influence on and interaction with the global flow field. The equations are solved in a cylindrical coordinate system using finite difference approximations of fourth-order accuracy in axial and radial directions and and a fourth-order accurate explicit Runge-Kutta scheme for the time integration. A pseudo-spectral method is employed in the azimuthal direction. Direct Numerical Simulations (DNS) were performed for a subsonic free stream Mach number of M ͚ = 0.2 and for supersonic free stream Mach numbers of M ͚ = 1.2 and M ͚ = 2.46. Large-Eddy Simulations (LES) were carried out for a subsonic free stream Mach number of M ͚ = 0.2 and a global Reynolds number of ReD = 2,000 and for a supersonic free stream Mach number of M ͚ = 2.46 and global Reynolds numbers of ReD = 30,000 and ReD = 100,000. Comparison of the instantaneous flow field for subsonic calculations with water channel experiments and incompressible simulations show good qualitative agreement. An absolute instability with regard to helical disturbances was found for the subsonic flow at ReD = 1,000 and for the supersonic flows for M ͚ = 1.2 and ReD ≥ 4,000 and for M ͚ = 2.46 and ReD ≥ 30,000. Small disturbances appear in the flow field near the corner of the base. As the disturbances are propagating downstream they grow and form intense vortical structures. These structures have a strong influence on the flow field, which results in a drastic change of the base pressure distribution and thus of the base drag.
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Chemama, Michael Leopold. "Flames, Splashes and Microdroplets: A Mathematical Approach to Three Fluid Dynamics Problems". Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:14226101.

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Three different problems in fluid mechanics are presented in this thesis. The first one deals with the mechanism behind the extinction of a flame by an alternating electric field. A simple model for the interaction between the field and the ions produced by the reaction is presented, which agrees quantitatively with the experiments. It also indicates that charges diffusion is responsible for the non-zero time averaged force on the flame. The second problem focuses on the role of viscosity during the splash of liquid droplets. We show that contrary to what was done in previous theoretical studies, the role of viscosity cannot be investigated within the framework of a boundary layer approximation. Rather, the full viscous term must be included in the equations. Finally, we present the theory behind a new microfluidic device (called centipede) which produces microdroplets at a very high rate without relying on any active element to precipitate the detachment of the drops. We clearly show that the drops detach through a Rayleigh-Plateau instability in an otherwise quasi-static flow. We also predict how the throughput and size of the drops are affected by the geometrical parameters of the device.
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Akbari, Mohammad Hadi. "Bluff-body flow simulations using vortex methods". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq55294.pdf.

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Laradji, Mohamed. "Ternary mixtures of water, oil and surfactants : equilibrium and dynamics". Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39483.

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The equilibrium phase behaviour of ternary mixtures of water, oil and surfactants is examined using both a lattice-gas model and a Ginzburg-Landau model. The lattice model is based on the Blume-Capel model with additional orientational degrees of freedom for surfactants, and the Ginzburg-Landau model is based on two local scalar fields. When the concentrations of water and oil are equal the following phases are observed: a water and oil rich phase, a lamellar phase, and a disordered phase which is divided into an ordinary disordered fluid and a microemulsion region. In the lattice model, a square phase is also observed. The effects of fluctuations on the lattice model is studied via Monte-Carlo simulations and by the Langevin approach in the Ginzburg-Landau model. In both cases, we found that in the vicinity of the water/oil coexistence region, the lamellar phase becomes unstable against the microemulsion.
Furthermore, we have studied the effects of surfactants on the dynamics of phase separation of two immiscible fluids, and found a drastic alteration in the kinetics. In particular, we found that surfactants slow down the growth to a non-algebraic one leading eventually to a microphase separation.
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Hausner, Alejo. "Non-linear effects in pulsating pipe flow". Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61228.

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The present thesis considers the phenomenon of flow-rate enhancement of polymer solutions in a pipe due to pulsating pressure gradients. It presents an historical review of the problem. The unexplained experimental dependence of enhancement on pulsation frequency reported by Barnes et al is examined, as are later theoretical attempts to reproduce their results. We find that the results can be reproduced only by omitting the important inertial term. The Modified Moment Method is applied to the problem. The results confirm the predictions of other models. The enhancement is of second order in the pulsation amplitude, exhibits a maximum when the pressure gradient is varied, and declines with increasing pulsation frequency. An expansion in powers of the pulsation amplitude gives a satisfactory approximation. Less power is consumed at the same rate of flow if the pressure gradient is constant and not pulsated.
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Elkouh, Nabil. "Laminar natural convection and interfacial heat flux distributions in pure water-ice systems". Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40347.

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Experimental and numerical investigations of laminar natural convection and interfacial heat flux distributions in pure water-ice systems are presented. The main goals are: (i) Resolution of several issues related to steady, two-dimensional, laminar natural convection in pure water near its density inversion temperature; and (ii) development, testing, and demonstration of a nonintrusive experimental/numerical method for the determination of interfacial heat flux distributions in steady, two-dimensional, pure water-ice systems.
Attention was found on pure water and water-ice systems contained in a long cylindrical enclosure of square cross-section. One wall was maintained at a constant temperature equal to or less than $0 sp circ$C; the opposite wall was maintained at a constant temperature above the density inversion temperature of water; the other two walls of the cross-section were essentially adiabatic. Several angles of inclination, $ Theta ,$ of the hot and cold walls, with respect to the gravitational acceleration vector, were considered: $ Theta = 0 sp circ , 30 sp circ , 45 sp circ ,$ and ${-}45 sp circ .$ For these conditions, the natural convection in water is governed by three nondimensional parameters: the Rayleigh number, Ra; a density inversion parameter, R; and the Prandtl number, Pr. The following ranges of these parameters were investigated: $10 sp3 le Ra le 3.37 times 10 sp7; 0.1 le R le 0.9;$ and $6.74 le Pr le 12.4.$
A complete rig was designed and constructed. The water-ice interface positions were obtained using shadowgraphy and computer-aided image processing techniques. In the complementary numerical work, a staggered-grid finite volume method (FVM) and a co-located, equal-order, control-volume finite element method (CVFEM) were formulated and used.
In the first investigation, variable- and constant-property models (VPM and CPM) were used. Results of the VPM and CPM were found to be similar, except when the values of R are in the vicinity of 0.5, where significant differences in the flow patterns, but only minor changes in the overall Nusselt number, $ overline{Nu},$ were observed. It was demonstrated that the fluid flow is extremely sensitive to changes in the value of R in the vincinity of 0.5. A correlation that gives the $ overline{Nu}$ as a function of Ra and R has been proposed for the vertical enclosure $( Theta = 0 sp circ ).$
In the proposed experimental/numerical technique to determine the interfacial heat flux distributions, the interface position obtained by the shadowgraphy and image processing techniques was used as an input to the CVFEM. The CVFEM was then used to solve the heat conduction problem in the ice and obtain the interfacial heat flux distribution. It was found that if the raw digitized interface position data are directly inputted to the CVFEM simulations of heat conduction in the ice, the interfacial heat flux distributions exhibit physically untenable fluctuations. The reasons for this difficulty were identified and successfully overcome using appropriate data filtering techniques. (Abstract shortened by UMI.)
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Libri sul tema "Mechanical physics - fluid"

1

Tucker, Paul G. Computation of Unsteady Internal Flows: Fundamental Methods with Case Studies. Boston, MA: Springer US, 2001.

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2

Bashkirov, Andrei G. Nonequilibrium statistical mechanics of heterogeneous fluid systems. Boca Raton, FL: CRC Press, 1995.

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3

Gatignol, Renée. Mechanical and thermodynamical modeling of fluid interfaces. Singapore: World Scientific, 2001.

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4

M, Cohen Ira, e Dowling David R, a cura di. Fluid mechanics. 5a ed. Waltham, MA: Academic Press, 2012.

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5

Leutloff, Dieter. Computational Fluid Dynamics: Selected Topics. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995.

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6

Pozrikidis, C. Fluid dynamics: Theory, computation, and numerical simulation. 2a ed. New York: Springer, 2009.

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7

Çengel, Yunus A. Fundamentals of thermal-fluid sciences. 2a ed. Boston: McGraw-Hill Companies, 2005.

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8

Chanson, Hubert. Applied hydrodynamics: An introduction to ideal and real fluid flows. Boca Raton: CRC Press, 2009.

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Johns, L. E. Interfacial instabily. New York: Springer, 2002.

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Fasel, Hermann F. Laminar-Turbulent Transition: IUTAM Symposium, Sedona/AZ September 13 - 17, 1999. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000.

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Capitoli di libri sul tema "Mechanical physics - fluid"

1

Zheng, Shaokai, Dario Carugo, Francesco Clavica, Ali Mosayyebi e Sarah Waters. "Flow Dynamics in Stented Ureter". In Urinary Stents, 149–58. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-04484-7_13.

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AbstractUrinary flow is governed by the principles of fluid mechanics. Urodynamic studies have revealed the fundamental kinematics and dynamics of urinary flow in various physiological and pathological conditions, which are cornerstones for future development of diagnostic knowledge and innovative devices. There are three primary approaches to study the fluid mechanical characteristics of urinary flow: reduced order, computational, and experimental methods. Reduced-order methods exploit the disparate length scales inherent in the system to reveal the key dominant physics. Computational models can simulate fully three-dimensional, time-dependent flows in physiologically-inspired anatomical domains. Finally, experimental models provide an excellent counterpart to reduced and computational models by providing physical tests under various physiological and pathological conditions. While the interdisciplinary approaches to date have provided a wealth of insight into the fluid mechanical properties of the stented ureter, the next challenge is to develop new theoretical, computational and experimental models to capture the complex interplay between the fluid dynamics in stented ureters and biofilm/encrustation growth. Such studies will (1) enable identification of clinically relevant scenarios to improve patients’ treatment, and (2) provide physical guidelines for next-generation stent design.
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Stell, G., G. N. Patey e J. S. Høye. "Dielectric Constants of Fluid Models: Statistical Mechanical Theory and its Quantitative Implementation". In Advances in Chemical Physics, 183–328. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470142684.ch3.

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Scotognella, Francesco. "Fluid Mechanics". In Undergraduate Texts in Physics, 75–80. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-35074-0_8.

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Soldati, Alfredo, e Cristian Marchioli. "Physical Models for Friction Forces". In Fluid Mechanics for Mechanical Engineers, 33–67. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-53950-3_2.

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Honerkamp, Josef, e Hartmann Römer. "Elements of Fluid Mechanics". In Theoretical Physics, 333–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-77984-8_9.

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Gudehus, Gerd. "Pore fluid". In Physical Soil Mechanics, 293–312. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-36354-5_6.

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Licata, Ignazio, Leonardo Chiatti e Elmo Benedetto. "Point, Fluid and Wave Mechanics". In SpringerBriefs in Physics, 41–65. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52271-5_4.

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Cessenat, Michel. "Fluid Mechanics Modelling". In Mathematical Modelling of Physical Systems, 335–405. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-94758-7_3.

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De Blasio, Fabio Vittorio. "Introduction to Fluid Mechanics". In Introduction to the Physics of Landslides, 53–87. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1122-8_3.

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Monson, P. A., e G. P. Morriss. "Recent Progress in the Statistical Mechanical Mechanics of Interaction Site Fluids". In Advances in Chemical Physics, 451–550. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470141267.ch8.

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Atti di convegni sul tema "Mechanical physics - fluid"

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Shiva Prasad, B. G., Philip Moeller e John Sheridan. "Thermo-Fluid Mechanics of Fluid Injection and Refrigeration System Performance Improvement". In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-44058.

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Injecting a fluid into a flowing stream is a common and powerful flow control technique to improve the flow process or performance of downstream components and machinery. This paper presents an application of such a technique to scroll compressors for improving the cooling capacity and efficiency of refrigerators and other heat pumps. It provides some insights into the physics of fluid injection and suggests methods for maximizing the benefits. Further, it discusses the need for CFD in system design and optimization and illustrates its application.
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Bielen, Jeroen, Jiri Stulemeijer, Deepak Ganjoo, Dale Ostergaard e Sander Noijen. "Fluid-electrostatic-mechanical modeling of the dynamic response of RF-MEMS capacitive switches". In Multi-Physics simulation and Experiments in Microelectronics. IEEE, 2008. http://dx.doi.org/10.1109/esime.2008.4525083.

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Pidugu, S. B., e T. Bayraktar. "Flow Physics in Microchannels". In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-80561.

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Even though microfluidic devices are slowly becoming commercial reality (e.g. Inkjet printers), the challenges in the design of microfluidic devices remain since not all aspects of fluid flow in microchannels have been fully understood yet. This paper presents an extensive review of studies on flow physics for both pressure-driven and electrokinetic flows in microchannels. The primary goal of the present paper is to provide a wide overview of findings on underlying principles of microflow physics. The issues discussed include the effect of pressure drop and friction measurements; mixing and flow control methods for microfluidic systems; and joule heating and viscous dissipation effects in microchannel flows. No agreement has been found among studies focusing on the characterization of friction factor/pressure drop for microflow systems. Further investigation requires understanding how entrance effects differ in the case of microflows when compared to macro scale flow. There is a clear need to investigate characteristics of non-Newtonian fluid flow in microchannels.
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Sharma, K. D., Rajneesh Kumar, Mohit Kumar Kakkar e Renu Bala. "Mechanical interaction at boundary surface of micropolar viscoelastic with voids and inviscid fluid". In DIDACTIC TRANSFER OF PHYSICS KNOWLEDGE THROUGH DISTANCE EDUCATION: DIDFYZ 2021. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0080966.

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Abda, Mohammed, e Frederick P. Gosselin. "Time-invariant hp-variational physics informed neural network to solve the pipe conveying fluid equation". In Canadian Society for Mechanical Engineering International Congress 2023. Sherbrooke, Canada: Université de Sherbrooke. Faculté de génie, 2023. http://dx.doi.org/10.17118/11143/21031.

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6

Berthet, Lucas, Hamid R. Karbasian, Bruno Blais e Frédérick P. Gosselin. "Physics-informed neural network-based modeling of the static reconfiguration of a plate under fluid flow". In Canadian Society for Mechanical Engineering International Congress 2023. Sherbrooke, Canada: Université de Sherbrooke. Faculté de génie, 2023. http://dx.doi.org/10.17118/11143/21033.

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Wong, K. L., e A. J. Baker. "A Modular Finite Element Parallel Fluid Applications Simulator". In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-1238.

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Abstract With the rapid advances in high-performance computing technology in recent years, researchers at the University of Tennessee have initiated a collaborative project to address the theoretical, algorithmic, and numerical implementation issues of computational mechanics simulations. To meet the challenge, a Parallel Interoperable Computational Mechanics Simulator System (PICMSS) has been established. Such effort entails the development of a modular finite element platform capable of admitting diverse CFD formulations, as well as closure models for physics phenomena, as required/derived by the users operating on supercomputers and networks of PC clusters. Incompressible Navier Stokes Benchmark solutions via a velocity-vorticity formulation are proposed to examine the integrity and scalability of PICMSS.
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Salary, Roozbeh (Ross), Jack P. Lombardi, Darshana L. Weerawarne, Prahalad K. Rao e Mark D. Poliks. "A Computational Fluid Dynamics (CFD) Study of Pneumatic Atomization in Aerosol Jet Printing (AJP) Process". In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-12027.

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Abstract Aerosol jet printing (AJP) is a direct-write additive manufacturing method, which has been utilized particularly for the fabrication of flexible and hybrid electronics (FHE). In spite of the advantages of AJP — e.g., high-resolution material deposition on nonplanar surfaces and accommodation of a wide renege of ink viscosity — AJP inherently is a complex process, prone to nonlinear process changes. Consequently, real-time process monitoring and control (with an understanding of the physics behind aerosol generation and transport) are inevitable. The overarching goal of this work is to establish a physics-based framework for process monitoring and closed-loop control (for correction) in AJP. In pursuit of this goal, the objective is to forward a CFD model to explain the underlying physical phenomena behind aerosol nebulization in AJP. To realize this objective, a 3D compressible, turbulent multi-phase flow CFD model is forwarded. The geometry of the pneumatic atomizer is modeled based on X-ray computed tomography (CT) imaging. The boundary conditions of the problem are defined based on experimental observations. The outcome of this study paves the way for understanding the complex mechanisms of aerosol generation in AJP and also design of efficient atomizers.
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Pepper, Darrell W., e Joseph M. Lombardo. "High-Performance Computing for Fluid Flow and Heat Transfer". In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32825.

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The use of computers in heat transfer and fluid flow has become so commonplace today that no one would consider working in either field without some knowledge of computing. Problems are now being solved on a daily basis that even a few years ago were considered intractable. While we once thought that a problem with a few million nodes was huge a few years ago, researchers are now addressing problems with over 100 million nodes. At such levels of detail, one can begin to model processes at the micro level of physics. When researchers are able to quickly analyze these gigantic data sets and can generate insightful graphical displays, the understanding of fundamental processes and governing relations will escalate tremendously.
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Estejab, Bahareh, e Francine Battaglia. "Modeling of Coal-Biomass Fluidization Using Computational Fluid Dynamics". In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63339.

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In an effort to assess the fluidization characteristics of coal-biomass mixtures, computational fluid dynamics (CFD) was used and validated. The gas and solids phases were modeled using an Eulerian-Eulerian approach to efficiently simulate the physics. The computational platform Multiphase Flow with Interphase eXchanges (MFIX) was employed to simulate the particle-particle interactions of coal-biomass mixtures and compare the predictions with experimental data. The coal-biomass mixtures included sub-bituminous coal and hybrid poplar wood. Particles properties of both materials fall within the Geldart A classification. Of particular interest to this study was predicting particle mixing in fluidized beds and biomass hydrodynamics. Both materials and two mass ratio mixtures were studied and pressure drop across the bed for various gas inlet velocities and bed height were analyzed and compared to the experiments.
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Rapporti di organizzazioni sul tema "Mechanical physics - fluid"

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Martinez-Sanchez, Manuel. Physical Fluid Mechanics in MPD Thrusters. Fort Belvoir, VA: Defense Technical Information Center, settembre 1987. http://dx.doi.org/10.21236/ada190309.

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Klammler, Harald. Introduction to the Mechanics of Flow and Transport for Groundwater Scientists. The Groundwater Project, 2023. http://dx.doi.org/10.21083/gxat7083.

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Starting from Newton’s laws of motion and viscosity, this book is an introduction to fundamental aspects of fluid dynamics that are most relevant to groundwater scientists. Based on a perspective of driving versus resisting forces that govern the motion of a fluid, the author derives Darcy’s law for flow through porous media by drawing an analogy to Bernoulli’s law for fluid with negligible viscosity. By combining the effects of gravity and pressure, the author identifies hydraulic head as a convenient numerical quantity to represent the force driving groundwater flow. In contrast to the physical derivation of hydraulic head, hydraulic conductivity emerges as a parameter related to the resisting frictional forces between the mobile fluid and the stationary porous medium. These frictional seepage forces also affect the effective stress state of the porous medium, thus establishing a link to soil stability and quicksand formation. Combining Darcy’s law with the law of mass conservation leads the reader to the fundamental equations of saturated groundwater flow. Finally, the effects of capillary forces are included to establish the governing equations for unsaturated and multi-phase flow. Throughout the book, the author focuses on thoroughly illustrating and deriving the equations while applying order of magnitude analyses. This approach makes it possible to extract the most information, for example in terms of the scale of response time, without requiring explicit solutions. A number of boxes and solved exercises contain further details and links to practical applications such as the water table ratio that reflects ‘fullness’ of an aquifer and the performance of slug tests for in situ measurement of hydraulic conductivity. This book makes an important contribution to groundwater science by providing a progressive introductory explanation of the physical mechanics of groundwater flow and the accompanying socioeconomic and ecological problems that may arise.
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