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Monday, May 11, 2020 | History

2 edition of Power disturbances close to hydrodynamic instability in natural circulation two-phase flow found in the catalog.

Power disturbances close to hydrodynamic instability in natural circulation two-phase flow

Ragnar P. Mathisen

Power disturbances close to hydrodynamic instability in natural circulation two-phase flow

by Ragnar P. Mathisen

  • 133 Want to read
  • 6 Currently reading

Published by Aktiebolaget Atomenergi in Stockholm .
Written in English

    Subjects:
  • Two phase flow.,
  • Boiling water reactors.

  • Edition Notes

    Bibliography: p. 10.

    Statement[by] R. P. Mathisen and O. Eklind.
    SeriesAtomenergi, Aktiebolaget. AE-, 285, AE (Series) (Stockholm, Sweden) ;, 285.
    ContributionsEklind, Olov, 1939- joint author.
    Classifications
    LC ClassificationsTK9008 .A77 no. 285
    The Physical Object
    Pagination19 p.
    Number of Pages19
    ID Numbers
    Open LibraryOL5380058M
    LC Control Number72395398

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    The ocean circulation is a cause and consequence of fluid scale interactions ranging from millimeters to more t km. Although the wind field produces a large energy input to the ocean, all but approximately 10% appears to be dissipated within about m of the sea surface, rendering observations of the energy divergence necessary to maintain the full water-column Cited by:   As an example in geophysical fluid dynamics, we use Eady’s model to study the behavior of small disturbances around a basic zonal flow in the case of baroclinic instability. We show that for a set of special parameters our method with some dominant modes captures the formation of coherent structures.

    Hydrodynamic numerical modelling has an important role to play in the assessment of these effects and the comparative evaluation of different layouts. The SUNTANS coastal model, developed by Stanford University, has already been implemented to investigate the hydrodynamic characteristics of tidal flow in the Pentland Firth. Introduction In this chapter, recommended correlations for the single-phase side (or sides) of heat exchangers are given. In many two-phase-flow heat exchangers, such as boilers, nuclear steam generators, power condensers, and air conditioning and refrigeration evaporators and condensers, one side has single-phase flow while the other side.


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Power disturbances close to hydrodynamic instability in natural circulation two-phase flow by Ragnar P. Mathisen Download PDF EPUB FB2

Introduction. Historically, the study of two-phase flow instabilities started with the pioneering article of l decades later, aroundthe development of industrial high-power-density boilers and boiling water reactors (BWR) turned the attention of many researchers into this kind of phenomena occurring in two-phase flow by:Flow Excursions and Oscillations in Boiling Two Phase Flow Systems with Heat Addition, EURA- TOM Report, Proc.

Symp. on Two-phase flow dynamics, Eindhoven (). [62] and rd, Hydraulic Instability in a Natural Circulation Loop with Net Steam Generation at psia, GEAP (). [63]Cited by: The investigation was centred on torque converters with two-phase flows, namely oil–air.

There are proposed theoretical, numerical models and an experimental facility, testing rig, was erected. The obtained results are in the hydrodynamic field (velocities and pressures) in the torus and the characteristic curves of the two-phase flow Author: rgl, zan, C.

Velescu, T. Milo, A. Manea, E. Dobând, C. Stroi. Review of research on flow instabilities in natural circulation boiling systems Article in Progress in Nuclear Energy 49(6) August with Reads How we measure 'reads'.

Two-phase flows are encountered in a wide range of industrial application. In the present work, two-phase computational fluid dynamics (CFD) calculations, using Eulerian–Eulerian model and commercial CFD package FLUENTwere employed to calculate pressure drops caused by abrupt flow area contraction in small circular pipes for two-phase flow of air and water mixtures Author: Ibtissem Belgacem, Y.

Salhi, E-K. Si-Ahmed. The studies on the analysis of two-phase flow instabilities by Ledinegg () created considerable interest concerning the phenomenon of thermally induced flow instability in two-phase flow systems. on torque converters with two-phase flows, namely oil–air.

There are proposed theoretical, numerical models and an experimental facility, testing rig, was erected. The obtained results are in the hydrodynamic field (velocities and pressures) in the torus and the characteristic curves of the two-phase flow hydrodynamic transmission.

Cambridge Core - Thermal-Fluids Engineering - Two-Phase Flow, Boiling, and Condensation - by S. Mostafa GhiaasiaanAuthor: S. Mostafa Ghiaasiaan. This paper is devoted to the numerical approximation of the solutions of a system of conservation laws arising in the modeling of two-phase flows in pipelines.

The PDEs are closed by two highly nonlinear algebraic relations, namely, a pressure law and a hydrodynamic one. The severe nonlinearities encoded in these laws make the classical approximate Riemann solvers Cited by: Oct. Brandstätter, Adel Ragab and S.

Shalaby: “Modeling of Two-Phase Flow and Slug Flow Characteristics in Horizontal/Inclined Pipelines using CFD,” Presented at SPE Romanian Conference Years of the Romanian Petroleum Industry, Tradition & challenges, held in Athénée Hilton Hotel-Bucharest Oct.

Author: Adel Ragab. To investigate two-phase effects, we conduct a similar simula-tion with nearly pure fluids, with a very lower volume fraction gas (water) evenly distributed in original pure water (gas), re-Figure 3: The evolution of the density at times of. Erratum to: “Hydrodynamic stability of the two-phase nonisothermal flow in a countercurrent spray dryer”Cited by: 3.

DEVELOPMENT OF A HYDRODYNAMIC MODEL FOR AIR-LIFT REACTORS. ho 1*, sa 1, o 1, Filho 1, ues 2 3, 3, 3, 3 and ard 4 1 School of Chemical Engineering, Campinas State University, Laboratory of Optimization, Design and Advanced Control (LOPCA), CPCEP.

The phase change from single-phase flow to two-phase flow initiates two-phase flow instabilities, whose phenomenology is known in both natural and forced circulation systems.

The instability mechanisms are associated with the propagation of perturbation in a two-phase flow due to feedback effects, which involve delays [ 74 ].Cited by: 1.

Hongtao Li, Ruoming Chen, Xiaojun Li, Yingfeng Meng, Li Zhu and Jibin Zhao, Investigation of pressure wave propagation and attenuation characteristics in wellbore gas-liquid two-phase flow, Journal of Natural Gas Science and Engineering, 35, (), ().Cited by: This book analyzes cells in slow and fast, one- and two-fluid flows and describes the mechanisms of cell generation: (a) minimal energy dissipation, (b) competing forces, (c) jet entrainment, and (d) swirl decay.

The book explains the vortex breakdown appearance, discusses its features, and indicates means of its by: 2. The Yearbook divides the project descriptions into three sections, one for each laboratory: the Laboratory for Heat and Power, the Laboratory.

An important topic in fluid dynamics is multiphase flows. Multiphase flows can be found in numerous fields in engineering, e.g. aerospace, biomedical, chemical, electrical, environmental, mechanical, materials, nuclear and naval engineering.

There is an enormous variation in applications, e.g. rocket engines, chemical reactors, contamination spreading, multiphase. Fluid dynamics is a discipline with many relevant applications in our modern world, most notably because it contains the study of aerodynamics, and also because it comprises part of weather prediction.

A typical fluid dynamics problem may include such variables as velocity, temperature, and density. The typical flow patterns for two-phase flow in a horizontal round tube are illustrated in Figure The characteristics of two-phase flow pattern are de fined as follows (Carey, ): Bubbly flow: The vapor bubbles te nd to flow the upper portion of the horizontal tube due to their buoyancy effect at the very low quality.

Flow patterns in downward two-phase flow Downward simultaneous flow of gas and liquid, although rare, is important in the chemical process industry and also in petroleum production. An example of two-phase down flow is the injection of wet steam in thermal recovery.Deendarlianto, Andinusa Rahmandhika, Arif Widyatama, Okto Dinaryanto, Adhika Widyaparaga and Indarto, Experimental study on the hydrodynamic behavior of gas-liquid air-water two-phase flow near the transition to slug flow in horizontal pipes, International Journal of Heat and Mass Transfer, /masstransfer,(Gajewski, “Electrostatic Nonintrusive Method for Measuring the Electric Charge, Mass Flow Rate, and Velocity of Particulates in the Two-Phase Gas–Solid Pipe Flows—Its Only or as Many as