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Tuesday, May 5, 2020 | History

2 edition of Dynamics of face and annular seals with two-phase flow found in the catalog.

Dynamics of face and annular seals with two-phase flow

Dynamics of face and annular seals with two-phase flow

  • 127 Want to read
  • 23 Currently reading

Published by National Aeronautics and Space Administration, Scientific and Technical Information Division, National Technical Information Service, distributor] in [Washington, DC], [Springfield, Va .
Written in English

    Subjects:
  • Sealing (Technology),
  • Two-phase flow.

  • Edition Notes

    StatementWilliam F. Hughes ... [et al.].
    SeriesNASA contractor report -- 4256., NASA contractor report -- NASA CR-4256.
    ContributionsHughes, William F. 1930-, United States. National Aeronautics and Space Administration. Scientific and Technical Information Division.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15396101M

    on the rotor's dynamics. Value and direction of forces arising up in non-contact seals is determined by their geometrical parameters of annular seal, pressure drop, properties of the pumped environment, frequency of rotation of rotor. There are basic geometrical parameters of annular seals (gap, taper), properties of the pumped.   An up-to-date and unparalleled in-depth treatment of all kinds of flow phenomena encountered in centrifugal pumps is given, including the complex interactions of fluid flow with vibrations and wear of materials. The scope includes all aspects of hydraulic design, 3D-flow phenomena and partload operation, cavitation, numerical flow calculations, hydraulic forces, pressure pulsations, noise 5/5(2).

      Testing of seals facing two-phase flow () for an annular seal with 2-phase flow. There has been recent interest in measuring the rotordynamic coefficients of a representative seal in 2-phase-flow conditions to examine the model’s accuracy. A validated 2-phase annular seal model would be of obvious value in predicting the rotordynamic. The tests were conducted with an inlet pressure/exit pressure ratio equal to and a rotor surface speed of m/s ( krpm), similar to conditions in a pump neck wear ring seal. The CFD two-phase flow model, first to be anchored to test data, uses an Euler-Euler formulation and delivers information on the precise evolution of the GVF and.

    The gas-water two-phase flow is very common in the industrial processes. the deep understanding of the two-phase flow state is to achieve the production equipment design and safe operation. In the measurement of gas-water two-phase flow, the differential pressure sensor is widely used, and some measurement model of multiphase flow have been : Pengcheng Ji, Feng Dong. The new analysis technique of Annular Flow Dynamics is a simple, practical way to predict and control rheology and hydraulics in drilling fluid systems. It is based on field experience in the sloughing shale areas of Canada and on a recently developed method of calculating annular pressure losses with greater accuracy and more simplicity than Cited by: 2.


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Dynamics of face and annular seals with two-phase flow Download PDF EPUB FB2

Work has been the dynamic analysis of axial motion of two-phase face seals, principally the determination of axial stiffness, and the steady behavior of two-phase annular seals.

The main conclusions are that seals with two-phase flow may be unstable if improperly balanced. Detailed theoretical analyses of low (laminar) and high (turbulent). Get this from a library.

Dynamics of face and annular seals with two-phase flow. [William F Hughes; United States. National Aeronautics and Space Administration. The main thrust was the dynamic analysis of axial motion of two-phase face seals, principally the determination of axial stiffness, and the steady behavior of two-phase annular seals.

The main conclusions are that seals with two-phase flow may be unstable if improperly balanced. Get this from a library. Dynamics of face and annular seals with two-phase flow. [William F Hughes; United States. National Aeronautics and Space Administration.;]. Annular Two-Phase Flow 1st Edition by G.F.

Hewitt (Author) › Visit Amazon's G.F. Hewitt Page. Find all the books, read about the author, and more. See search results for this author. Are you an author. Learn about Author Central. G Cited by: Annular Two-Phase Flow presents the wide range of industrial applications of annular two-phase flow regimes.

This book discusses the fluid dynamics and heat transfer aspects of the flow pattern. Organized into 12 chapters, this book begins with an overview of the classification of the various types of interface distribution observed in practice.

Annular Two-Phase Flow presents the wide range of industrial applications of annular two-phase flow regimes. This book discusses the fluid dynamics and heat transfer aspects of the flow pattern. Organized into 12 chapters, this book begins with an overview of the classification of the various types of interface distribution observed in practice.

This text then examines the various regimes of two-phase flow Book Edition: 1. Two-Phase Flow in Annular Pressure Seals and Face Seals The theoretical treatment of multi-phase flow in annular seal applications is only recent. Several analysis present modifications to the classical lubrication theory in order to account for the multi-phase phenomena.

This book is intended to be an introduction to the theory of thermo-fluid dynamics of two-phase flow for graduate students, scientists and practicing engineers seriously involved in the subject. It can be used as a text book at the graduate level courses focused on the two-phase flow in Nuclear.

reliable, accurate two-phase flow simulation results. The second project goal was to complete a two-phase flow simulation and compare the results for flow regime, pressure drop, liquid holdup, and axial dispersion to the experimental results of Vonortas et al. ANSYS was the primary CFD program chosen for this project, however due File Size: 3MB.

This book should serve as a handbook regarding mechanical interaction in multiphase flow dynamics. The up-dating of the information in this revised edition satisfies the need of researchers, who can refer to the book during their investigations.” (S.

Rajvanshi, Zentralblatt MATH, Vol.)Brand: Springer-Verlag Berlin Heidelberg. from book Nuclear Thermal Hydraulics Basics of fluid dynamics were discussed in former chapters. Air/water and vapor/freon were utilized to scale and simulate annular two-phase flow for. annular seals. Nelson and Nguyen (a, b) extended the perturbation technique to handle two-phase flows in seals and analyzed the rotordynamic coefficients of incompressible flows with a relative rough surface.

Scharrer and Nuez () presented an analysis for an in-compressible flow in a centered annual seal with a deformed surface. annular seal was first given by A.A. Lomakin in [5]. The earlier work where seals influence on the rotors dynamics was investigated is work of Rudis and Marcinkovskiy.

[6]. Black was the first person abroad who explained influence of forces in an annular seal on dynamics of the turbine compressor rotor and obtained. A two-fluid model for annular two-phase flow is presented, which incorporates realistic phase interaction terms corresponding to turbulence in the gas phase, interphase pressure differences, and profile effects (nonuniform velocity profiles); this model avoids the conundrum of illposedness associated with the simplest averaged model [D.

Drew, Continuum modelling of two-phase flows, in Cited by: A new mathematical theory for the analysis of leakage rate behavior of annular shaft seals operating in the two-phase regime is presented which is based on the stratified flow of the boiling liquid and vapor phases.

The flow is presumed to be axisymmetric, steady, and so rapid as to be by: 8. The present study concerns the leakage predictions in pressure annular centered seals operating in a two-phase (gas–liquid) smooth stratified flow pattern.

In such systems, the liquid experiences centrifugal forces typically 3–4 orders of magnitude larger than the standard earth : Gioacchino Grimaldi, Giuseppe Pascazio, Giuseppe Vannini, Luciano Afferrante.

To improve the annular seal behavior and increase the rotor stability, high-precision results of leakage flow rates and rotordynamic force coefficients are needed for annular gas seals in wet gas. Multi-phase flows are part of our natural environment such as tornadoes, typhoons, air and water pollution and volcanic activities as well as part of industrial technology such as power plants, combustion engines, propulsion systems, or chemical and biological industry.

The industrial use of Brand: Springer-Verlag Berlin Heidelberg. Numerical simulation using computational fluid dynamics (CFD) has been carried out to study air and water two-phase flow in a small horizontal pipe of an inner diameter of mm, in order to investigate unsteady flow pattern transition behaviours and underlying physical : Jun Yao, Yufeng Yao, Antonino Arini, Stuart Mciiwain, Timothy Gordon.

Thermo-Fluid Dynamics of Two-Phase Flow, Second Edition is a must have reference for graduate students, scientists and engineers who need in-depth theoretical foundations to solve two-phase flow problems in various technological systems.The nonlinear dynamics of the concentric, two-phase flow of two immiscible fluids in a circular tube is studied when the viscosity ratio of the fluid in the annulus to that in the core of the tube, μ, is larger than or equal to unity.

For these values of the viscosity ratio the perfect core-annular flow (CAF) is linearly unstable and it is necessary to keep the ratio of the thickness of the Cited by: Two Phase Flow. Abdul Basit Ahmad ME02 IIT Patna Two Phase Flow Special case of Multiphase flow A gas-liquid flow is called two phase flow Large scale power systems most commonly studied case Also in refrigeration, heat pumps and air conditioning5/5(1).