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Monday, May 11, 2020 | History

3 edition of study of cavitating and flashing flows. found in the catalog.

study of cavitating and flashing flows.

J. M. Stephenson

study of cavitating and flashing flows.

by J. M. Stephenson

  • 211 Want to read
  • 15 Currently reading

Published by Technical Extension Service, Washington State University in Pullman .
Written in English

    Subjects:
  • Cavitation,
  • Jets -- Fluid dynamics

  • Edition Notes

    SeriesWashington State Institute of Technology. Bulletin 290
    Classifications
    LC ClassificationsT7 .W252 no. 290
    The Physical Object
    Paginationvi, 63 l.
    Number of Pages63
    ID Numbers
    Open LibraryOL5479104M
    LC Control Number73200043

    In this study, we deal with numerical simulation of a cavitating hydrogen flow in a Venturi orifice. This configuration has been widely studied experimentally by Hord, who obtained experimental temperature and pressure profiles of several cases at different operating numerical domain considered in this study is shown in Fig. 1 and consists of an axial-symmetric geometry that Cited by: the study of the evolution of a free-surface in a partially cavitating/condensing liquid column, to verify the conservativeness and boundedness while phase-fraction equations are solved with phase-change; 3) a cavitating flow evolving inside an injector nozzle,. Bubble rising in a liquid columnCited by: 1. Liquid choked flow in control valves results in either flashing, or more often, cavitation. The classical approach to explaining choked flow is by assuming that flow increases linearly with the square root of pressure drop, ∆P, until ∆P reaches the choked pressure drop, ∆P choked, and then immediately becomes fully choked with no further increase in flow. An Erosion Aggressiveness Index (EAI) Based on Pressure Load Estimation Due to Bubble Collapse in Cavitating Flows Within the RANS Solvers. SAE International Journal of Engines, 8(5), pp. doi: / Book Section.

    The results of this study are applied to the cavitating pump impeller and inducer data published by the NASA Lewis Research Center. Fxisting techniques for predicting the cavitating ‘ performance of pumping machinery are extended to include variations in flow coefficient, cavita- . D. Fuster, A Review of Models for Bubble Clusters in Cavitating Flows, Flow, Turbulence and Combustion, /s, (). Crossref Volume , Issue 13Cited by: Mechanical engineer here, former US Navy nuke. The textbook definition of cavitation is, from my nuclear training: "The formation and subsequent collapse of vapor bubbles as the suction pressure falls below and then rises above saturation pressure.". This definition is referring to the suction pressure as in a pump, but I would say more generally and apparently against most of the other. Papers: Schmidt, D.P, Nouar, I., Senecal, P.K., Hoffman, J., Rutland, C.J., Martin, J.K., Reitz, R.D., "Pressure-Swirl Atomization in the Near Field," SAE Paper.

    Saurel R, Petitpas F, Abgrall R. Modelling phase transition in metastable liquids: application to cavitating and flashing flows. J Fluid Mech ; – Scardina P, Edwards M. Air binding in granular media filters. J Environ Eng ; Scardina P, . A collocated finite volume method for predicting flows at all speeds. Comparative evaluation of phase-change mechanisms for the prediction of flashing flows, International Journal of Multiphase Flow, 95, () Numerical study of cavitating flow inside a flush valve, Mécanique & Industries, 12, 6, (), (). Crossref. Plesset, M.S. and Prosperetti, A. (). Bubble dynamics and cavitation. Ann. Rev. Fluid Mech., 9, Prosperetti, A. and Lezzi, A. (19 86). Bubble dynamics. [Oxford Engineering Science Series] Christopher E. Brennen - Cavitation and bubble dynamics(linked HTML version) ( Oxford University Press USA).pdf.


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study of cavitating and flashing flows. by J. M. Stephenson Download PDF EPUB FB2

Study of cavitating and flashing flows. Pullman: Technical Extension Study of cavitating and flashing flows. book, Washington State University, (OCoLC) Material Type: Thesis/dissertation: Document Type: Book: All Authors / Contributors: J M Stephenson.

Some differences in the cavitating flow pattern and the void fraction are found between He II and He I cavitating flows. The PIV result indicates that the void fraction for He II flow is larger than that for He I flow.

The development of voids in nonequilibrium flashing flows is shown to be dependent on threemore The study of cavitation. In the present study, viscous silicone oils are used within a small scale Venturi geometry to investigate attached cavitation into laminar separated flows for Reynolds numbers from to @article{osti_, title = {Transient characteristics of a cavitating centrifugal pump system at rapid change in flow rate}, author = study of cavitating and flashing flows.

book, Hiroshi and Tanaka, Teiichi}, abstractNote = {A series of studies on dynamic characteristics of noncavitating centrifugal pump under a variety of unsteady operations were extended to the cavitating case.

Cavitation is a phenomenon in which rapid changes of pressure in a liquid lead to study of cavitating and flashing flows. book formation of small vapor-filled cavities in places where the pressure is relatively low.

When subjected to higher pressure, these cavities, called "bubbles" or "voids", collapse and can generate shock wave that is strong very close to the bubble, but rapidly weakens as it propagates away from the bubble.

The simulation of cavitating flows is a challenging problem both in terms of modelling the thermodynamic path during the phase transition and the complex interaction with the turbulence.

Based on a one-fluid compressible Reynolds-Averaged Navier-Stokes (RANS) solver, a numerical study is proposed to investigate and to compare different Author: Eric Goncalves, Eric Goncalves.

We employ a barotropic two-phase/two-fluid model to study the primary break-up of cavitating liquid jets emanating from a rectangular nozzle, which resembles a high aspect-ratio slot flow. All components (i.e., gas, liquid, and vapor) are represented by a homogeneous mixture approach.

The cavitating fluid model is based on a thermodynamic-equilibrium by: The hydrodynamic cavitation in a Venturi tube is studied both theoretically and experimentally.

A lumped parameter model was developed to describe the accumulation and dissipation of energy in the biphasic flow as a function of the bubble population characteristics (mean volume, standard deviation, and Cited by: 1.

It is crucial to study the cavitating flows of thermo-fluids for the practical significance in superconductive magnets, fuel supply system for engines and the apparatus for electronics cooling.

We use the same test problems on metastable liquids as in Saurel et al. Saurel, F. Petitpas, R. Abgrall, Modeling phase transition in metastable liquids: application to cavitating and flashing.

A dynamical study of a bubbly flows in a transversal varying section duct (Venturi), is modeled by the use of the mass and momentum phases equations, which are coupled with the Rayleigh-Plesset equation of the bubbles dynamics.

The effects of the throat dimension and the upstream void fraction on flow parameters are investigated. The numerical resolution of the previous equations set let us. Suggested Citation:"5 Cavitation and Bubbly Flows." National Research Council.

Twenty-Second Symposium on Naval Hydrodynamics. Washington, DC: The National Academies Press. doi: / Understanding such bubbly flow and shock wave processes is important because these flow structures.

The thermodynamic effect on cryogenic cavitating flow characteristics of pressurized liquid nitrogen in a horizontal rectangular nozzle is precisely investigated by numerical analysis based on an unsteady thermal nonequilibrium two-fluid model and by flow visualization by: 7.

Liquid flows between the impeller and the housing at very high velocity, causing a vacuum at the housing wall and the formation of bubbles. As with suction cavitation, the implosion of those bubbles triggers intense shockwaves, causing premature wear of the impeller tips and pump housing.

Cavitation is the formation of vapour cavities in a liquid, small liquid-free zones ("bubbles" or "voids"), that are the consequence of forces acting upon the liquid. It usually occurs when a liquid is subjected to rapid changes of pressure that cause the formation of cavities in the liquid where the pressure is relatively low.

When subjected to higher pressure, the voids implode and can. The capability to investigate cavitation with a numerical code is of great benefit in the design and operation of many engineering systems.

However, the simulation of cavitating flow is a challenging problem both in terms of developing robust numerical methodologies and modeling the physics. Cavitating flows are characterized by considerable variations of the local density and speed of sound Cited by: Finally, the third part of the book illustrates the alternative approaches for the simulation of cavitating flows, with emphasis on both modeling and numerical aspects.

Examples of applications to the simulation of unsteady cavitation in internal flows through hydraulic machinery are illustrated in detail. INTRODUCTION. In the preceding chapter some of the equations of bubble dynamics were developed and applied to problems of bubble growth.

In this chapter we continue the discussion of bubble dynamics but switch attention to the dynamics of collapse and, in particular, consider the consequences of the violent collapse of vapor-filled cavitation bubbles.

Abstract. A hyperbolic two-phase flow model involving five partial differential equations is built for liquid-gas interface modelling. The model is able to deal with interfaces of simple contact where normal velocity and pressure are continuous as well as transition fronts where heat and mass transfer occur, involving pressure and velocity by: 1.

() Modelling phase transition in metastable liquids: application to cavitating and flashing flows. Journal of Fluid Mechanics () The sharp-interface approach for fluids with phase change: Riemann problems and ghost fluid by:.

flashing/cavitating pdf is that when the gas bubbles form, they occupy much more volume than the liquid phase which causes a closing off of the flow passages inside the valve thereby reducing the capacity.

This reduction in capacity is very design dependent so File Size: 1MB.appropriate. This book is download pdf at graduate students and researchers at the cutting edge of investigationsinto the fundamental nature of multiphase flows; it is intended as a reference book for the basic methods used in the treatment of multiphase flows.

I am deeply grateful to all my many friends and fellow researchers in theFile Size: 6MB.Ebook propeller model in a water tunnel experiment. High-speed jet of fluid impact on a fixed surface. Cavitation ebook on a valve plate for an axial piston hydraulic pump. This video shows cavitation in a gear pump.

Cavitation is a phenomenon in which rapid changes of pressure in a liquid lead to the formation of small vapor-filled cavities, in places where the pressure is relatively low.