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Wednesday, April 22, 2020 | History

1 edition of Entrainment modelling of buoyant momentum jets in water found in the catalog.

Entrainment modelling of buoyant momentum jets in water

David Stuart Hilder

Entrainment modelling of buoyant momentum jets in water

  • 382 Want to read
  • 2 Currently reading

Published by Naval Postgraduate School in Monterey, CA .
Written in English

    Subjects:
  • Mechanical engineering

  • Edition Notes

    SeriesNPS-69-81-006
    ID Numbers
    Open LibraryOL25518341M

    The Scientific Problem That Must Be Experienced: To understand turbulence we need the intuitive perspective of art. - Read online for free. When the German physicist Arnold Sommerfeld assigned his most brilliant student a subject for his doctoral thesis in , he admitted that “I would not have proposed a topic of this difficulty to any of my other pupils.”. The time scales in these definitions are fundamental, but vary by an order of magnitude, a function of context and application. On the short end, it takes minutes for air in a buoyant updraft to rise from a strongly heated surface to m above ground, where it can deposit pollutants or form a cloud; over a h period, the temperature in the boundary layer varies more strongly than the air Cited by: 1. Shaky life of a water drop in an anise oil-rich environment D. Robles, O.R. Enríquez, P. Peñas-López, and J. Rodríguez Rodríguez Phys. Rev. Fluids 4, () BibTeΧ: Multiphase buoyant plumes with soluble drops or bubbles S. Chu and A. Prosperetti Phys. Rev. Fluids 4, () BibTeΧ: Violent expansion of a rising Taylor bubble. The influence of subgrid-scale modelling on the performance of a new non-equilibrium wall-model for large-eddy simulation. Proceedings - 15th European Turbulence Conference, ETC VerHulst C, Meneveau C (). Altering kinetic energy entrainment in large eddy simulations of large wind farms using unconventional wind turbine actuator forcing.

    Get this from a library! Sustainable hydraulics in the era of global change: advances in water engineering and research: proceedings of the 4th IAHR Europe Congress, Liege, Belgium, July [Sébastien Erpicum; Benjamin Dewals; Pierre Archambeau; Michel Pirotton;] -- In an increasingly urbanized world, water systems must be designed and operated according to innovative standards in.


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Entrainment modelling of buoyant momentum jets in water by David Stuart Hilder Download PDF EPUB FB2

Increase of flow occurs through entrainment of ambient water. πsi dQ rv dx =2 ΔπΔQrvx=2 si Mass balance equation for water: max. i π s vQ u Dr = 0 ≅ 0 1 2 Using previous expression for flow: Entrainment velocity is about 5% of velocity at jet axis Plane Jet Rectangular slot with large width in relation to Size: 1MB.

Experimental studies of turbulent entrainment into jets and buoyant plumes in which particles contribute only to mean physical properties of the mixture, such as density, have a long Entrainment modelling of buoyant momentum jets in water book.

Modelling and experimental investigation of horizontal buoyant gas jets injected into stagnant uniform ambient liquid Article in International Journal of Multiphase Flow 93 May with Reads. In hydrodynamics, a plume or a column is a vertical body of one fluid moving through another.

Several effects control the motion of the fluid, including momentum (inertia), diffusion and buoyancy (density differences). Pure jets and pure plumes define flows that are driven entirely by momentum and buoyancy effects, respectively. Flows between these two limits are usually described as forced.

Mechanics of Turbulent Buoyant Jets and Plumes 15 The primary impetus to the more recent work on the large scale structure in the near field region of jets has been to relate the vortex nature of the flow to pressure fluctuations.

More specifically, investigations have Cited by: An experimental study was performed to investigate the behavior of inclined negatively buoyant jets. Such jets arise when brine is discharged from desalination plants. A turbulent jet with a specific salinity was discharged through a circular nozzle at an angle to the horizontal into a tank with fresh water and the spatial evolution of the jet was by: 8.

Similarly to single-phase buoyant jets (see Papanicolaou and List ), L describes the relative importance of momentum and buoyancy fluxes. Figs. Figs.

5(a, b) show, respectively, the normalized centerline velocity inverse M 0 1 / 2 / (u m z) and the normalized liquid jet radius b / L as a function of a normalized distance from the source.

Turbulent Buoyant Jets in Shallow Fluid Layers The l a t t e r expression i s b e t t e r normalized by t a k i n g the fluxes per u n i t width, m0 and p 0, so t h a t Hp2/3 c ° = m o (75b) The critical depth in the intermediate range is a more general function of the dis charge by: In some outfall systems, wastewaters are discharged into ambient water bodies using rosette-type diffusers in the form of multiple buoyant jets, and it is essential to simulate their mixing characteristics for practical applications and optimal design purposes.

The mixing processes of a rosette jet group are more complicated than single jets and multiple horizontal or vertical jets, and thus Author: Xiaohui Yan, Abdolmajid Mohammadian, Xin Chen.

This study presents a simple model to predict the liquid volume flux induced by round bubbly jets. The model is based on the classical integral equations for bubble plumes, but also accounts for th. This process is particularly important in the dynamics of convective plumes.

The concept of entrainment was been formalised by Morton et al., who introduced entrainment velocity in their simplified steady 1D model of buoyant plumes. Entrainment is a process linked to turbulence and is thus inherently three-dimensional (3D) and by: 3. Thus in general glacial meltwater rises as a positively buoyant forced plume as it enters the saline water of a fjord.

The trajectory of the glacial meltwater discharge once it enters the ocean depends on whether the plume emerges from an englacial or subglacial position and whether its flow is dominated by buoyancy or momentum forces [ Powell Cited by: Relativistic fluid dynamics: physics for many different scales N.

Andersson School of Mathematics University of Southampton phenomenon that arises naturally is the so-called entrainment effect, which plays a crucial role in The two fluids air and water are. For dispersion modelling a very wide range of scenarios can be considered.

Distinction can be made between momentum (un-pressurised or pressurised releases), time-dependency (steady-state, finite-duration, instantaneous or time-varying dispersion), buoyancy. TAMOC includes capabilities to model major blowouts or ruptures and the transition to a buoyant bubble or droplet plume as entrainment and ebullition occur.

31, 34 For our purposes of modeling a CO 2 well blowout, we make use of TAMOC's built‐in equation of state model 32 and the default TAMOC database including CO 2 chemical properties that. (flashing propane jets), experiments by the Von Karman Institute (flashing RA jets), and water and butane experiments carried out by Ecole des Mines and INERIS].

It also includes validation of the rainout against the CCPS experiments (flashing jets of water, CFC, chlorine, cyclohexane, monomethylamine). Fan LN: Turbulent Buoyant Jets into Stratified or Flowing Ambient Fluids. W.M. Keck Laboratory for Hydraulics and Water Resources, California Institute of Technology, Report No.

KH. In other fields of geophysics, buoyant plumes and jets are known to play important roles in oceanic mixing processes, both at the relatively large scale (as in deep water formation by convective sinking) and at the relatively small scale (as with plume formation beneath ice leads, for example).

Finally, specific features of buoyant spreading and diffusion processes in the far-field are discussed. Buoyant Plane Jet Processes in Deep Water The effluent leaving the diffuser ports behaves as a series of round buoyant jets (see FigureHolley and Jirka, ) and hence round buoyant jet analysis can be used for prediction.

Turbulent entrainment in a gravity current M. Holzner, M. van Reeuwijk & H. Jonker. Remote sensing and coastal morphodynamic modelling: A review of current approaches and future perspectives M. Benincasa, F. Falcini, C. Adduce & R. Santoleri. A comparison of simple buoyant jet models with CFD analysis of overflow dredging plumes.

Lee (civil engineering, U. of Hong Kong) and Chu (civil engineering and applied mechanics, McGill U., Canada) develop a Lagrangian approach to model turbulent jets and plumes, beginning with simple problems, and advancing toward the practical case of a turbulent buoyant jet. head above datum/water depth (m) j o.

buoyancy flux per diffuser length, j o = g′q o (m 3 /s 2) J o. buoyancy flux (m 4 /s 3) h o. height of discharge port (m) ℓ. riser spacing (m) L. length of the considered pipe section (m) L M. momentum length scale (m) ℓ M. slot jet/plume transition length scale ℓ M = m o /j o 2/3 (m) ℓ m Author: Tobias Bleninger, Robin Morelissen.

This book aims at fulfilling the need for a handbook at undergraduate and starting researcher level on fire and smoke dynamics in enclosures, giving fluid mechanics aspects a central role. Fluid mechanics are essential at the level of combustion, heat transfer and fire suppression, but they are described only cursorily in most of the existing.

For dispersion modelling a very wide range of scenarios can be considered. Distinction can be made between momentum (un-pressurised or pressurised releases), time-dependency (steady-state, finite-duration, instantaneous or time-varying dispersion), buoyancy (buoyant.

On the highly unsteady dynamics of multiple thermal buoyant jets in cross flows Physics of Flu ( “ Turbulent entrainment in jets with arbitrary buoyancy,” J.

Fluid Mech. “ 3D numerical simulation of ambient discharge of Author: Marcello Lappa. Wind Tunnel Modelling of Buoyant Chimney Plumes. 3rd Australasian Conference on Hydraulics and Fluid Mechanics, The Institution of Engineers, Australia.

Paper No. Meroney, R. The Fraser River plume is the brackish surface layer formed when the Fraser River discharges into the Strait of Georgia. Two approaches to understanding the dynamics of the plume are discussed. Initially, a series of field observations was carried out in the plume.

These consisted mainly of CSTD profiles and current profiles in the upper meters of the water column. Also, a surface. A computational fluid dynamic model that can solve the Reynolds-averaged Navier-Stokes equations and the species transport equation is developed to simulate two coalescing turbulent forced plumes, which are released with initial momentum and buoyancy flux.

Proceedings of the 6th International Symposium on Enviornmental Hydraulics, Athens, Greece, June Environmental Hydraulics, Two Volume Set Spreading of buoyant jets and fountains in a calm, linearly density-stratified fluid Spatial water quality modelling using unstructured cellular automata for spiked pollution loading in Author: Anastasios Stamou.

Below is a collection of technical papers in our Water & Environmental Bibliography. All of these papers feature FLOW-3D more about how FLOW-3D can be used to successfully simulate applications for the Water & Environmental Industry.

Hamidreza Samma, Amir Khosrojerdi, Masoumeh Rostam-Abadi, Mojtaba Mehraein and Yovanni Cataño-Lopera, Numerical simulation of. In contrast, most studies find that V up ∝ Q 1/3 for strong plumes, 23,39 where the synergy of bubbles in close proximity produces significant hydrodynamic interactions.

41 Fluid entrainment (acceleration of low momentum, ambient fluid causing plume growth and driven by the buoyancy flux) is usually parameterized as proportional to V up. POTENTIAL ENVIRONMENTAL EFFECTS OF AN OFFSHORE SUBMERGED NUCLEAR POWER PLANT VOLUME 1 by GENERAL DYNAMICS Electric Boat Division Groton, Connecticut, U for the WATER QUALITY RESEARCH OFFICE ENVIRONMENTAL PROTECTION AGENCY Program GFI Contract June For sale by the Superintendent of Documents, U.S.

Government. The behaviour and movement of pulpmill pollutants discharged into the Northern Fraser River is of significant concern due to their potential impact on this valuable aquatic ecosystem. The shallow receiving water can influence the mixing and subsequent dilution of these discharges.

The association of contaminants with suspended sediment, either by direct adsorption or flocculation of. Ocean modelling for coastal management – Case studies with MOHID M. Mateus and R. Neves (eds.), IST Press, ACKNOWLEDGEMENTS M.

Mateus • R. Neves The editors would like to thank the authors who contributed to this book for their enthusi-asm and willingness to share their own work and experience as MOHID users. The MOHID. "Merci and Beji's new book on fire dynamics with emphasis on the fluids mechanics aspects is a solid contribution to the literature in the field.

Its comprehensive discussion of fluid mechanics principles applied to plumes, fire behavior in enclosures and CFD models is : Taylor & Francis Ltd. A high velocity jet fire can cause catastrophic failure due to flame impingement or radiation.

The scenario becomes more complicated when multiple jet fires exist following ignition of release from pressure relief valves (PRV) as the thermal effect not only distorts the individual jet flame but also changes the flame height and temperature profile and such kind of high velocity jet flames have Author: T.

Ho, S. Fu, Christopher Y. Chao, Sharad Gupta. 3 from vessels and/or short pipes including amongst others the above cases.

Figure 3 illustrates the comparison for the Phast model against sub- cooled water jets. The Phast long pipeline model has been validated for propane two-phase releases [Isle of Grain experiments (Cowley and Tam, ; Webber et al., )].

The filling box model was first introduced by Baines and Turner () who examined and quantified the time-dependent stratification in an unventilated cylindrical compartment of radius R and height H, with an initially uniform environment, established by a single turbulent plume from a localised buoyancy source located centrally at the base (z = 0) of the by: 1.

Fluid Mechanics Aspects Of Fire And Smoke Dynamics In Enclosures è un libro di Merci Bart, Beji Tarek edito da Crc Press a marzo - EAN puoi acquistarlo sul. Cambridge Core - Mathematical Physics - The Turbulent Ocean - by S.

Thorpe Skip to main content Accessibility help We use cookies to distinguish you from other users and to provide you with a better experience on our : S. Thorpe. This study focuses on a numerical model of turbidity currents with reversing buoyancy, i.e., flows that are rendered heavier than the ambient water due to the presence of suspended sediment but that Cited by: This book aims at fulfilling the need for a handbook at undergraduate and starting researcher level on fire and smoke dynamics in enclosures, giving fluid mechanics aspects a central role.

Fluid mechanics are essential at the level of combustion, heat transfer and fire suppression, but they are desc.Numerical modelling of meandering jets in shallow rectangular reservoir using two different turbulent closures Y.

Peltier, S. Erpicum, P. Archambeau, M. Pirotton & B. Dewals. Turbulent momentum exchange over a natural gravel bed C. Miozzo, A. Marion, A. .