Numerical Modelling of Cavitation: Validation and Parametric Studies

Margot, Xandra; Hoyas, Sergio; Megías, Antonio Gil; Patouna, Stavroula

doi:10.1080/19942060.2012.11015399

Cited by 24 publications

(20 citation statements)

References 16 publications

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“…A vast amount of literature is dedicated to study the heat transfer and flow field characteristics for the mixed convection case and numerical modeling in real case studies [1][2][3][4][5][6][7][8]. Saeidi and Khodadadi [3] have studied the unsteady laminar flow with an square enclosure with two ventilation ports.…”

Section: Introductionmentioning

confidence: 99%

Effects of an adiabatic fin on the mixed convection heat transfer in a square cavity with two ventilation ports

Selimefendigil

Oztop

2014

THERM SCI

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In this study, a square cavity with two ventilation ports in the presence of an adiabatic fin of different lengths placed on the walls of the cavity is numerically analyzed for the mixed convection case for a range of Richardson numbers (Ri = 0.1, 1, 10, 100) and at Reynolds number of 300. The effect of the fin height, placement of the fin on each of the four walls of the cavity and Richardson number on the heat transfer and fluid flow characteristics is numerically analyzed. The results are presented in terms of streamlines, isotherm plots, and averaged Nusselt number plots. It is observed that for the convection dominated case, fin length and its position on the one of the four walls of the cavity do not alter the thermal performance whereas when the buoyancy effects become important thermal performance increases for high fin length.

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Section: Introductionmentioning

confidence: 99%

Effects of an adiabatic fin on the mixed convection heat transfer in a square cavity with two ventilation ports

Selimefendigil

Oztop

2014

THERM SCI

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“…calculations, and because the results are quite independent of the turbulence model, as demonstrated in [33]. The mesh used is a 3D mesh with around 57,000 cells, and it is shown in Fig.…”

Section: Analysis Of the Effect Of Local Variations In Vapor Mass Framentioning

confidence: 99%

A comprehensive study on the effect of cavitation on injection velocity in diesel nozzles

López

Salvador

Garza

et al. 2012

Energy Conversion and Management

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Arregle, JJP. (2012). A comprehensive study on the effect of cavitation on injection velocity in diesel nozzles. Energy Conversion and Management. 64:415-423. doi:10.1016/j.enconman.2012.03.032. A comprehensive study on the effect of cavitation on injection velocity in diesel nozzles AbstractResults when testing cavitating injection nozzles show a strong reduction in mass flow rate when cavitation appears (the flow is choked), while the momentum flux is reduced to a lesser extent, resulting in an increase in effective injection velocity. So as to better understand the origin of this increase in effective injection velocity, the basic equations for mass and momentum conservation were applied to an injection nozzle in simplified conditions. The study demonstrated that the increase in injection velocity provoked by cavitation is not a direct effect of the latter, but an indirect effect. In fact, the vapor appearance inside the injection hole produces a decrease in the viscosity of the fluid near the wall. This leads to lower momentum flux losses and to a change in the velocity profile, transforming it into a more "top hat" profile type. This change in the profile shape allows explaining why the momentum flux reduction is not so important compared to that of the mass flow rate, thus explaining why the effective injection velocity increases.

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“…Meanwhile, Bernad and Susan-Resiga (2012) set up a numerical model of hydraulic poppet valves and investigated the cavitation flow inside the cavity. Margot et al (2012) also presented validation and parametric studies of a numerical modelling of cavitation. Chern et al (2013) carried out a numerical study on cavitation occurrence in a globe valve.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of flow and cavitation characteristics in a pilot-control globe valve with different valve core displacements

Qian

Jin

2016

JZUS-A

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Abstract:The pilot-control globe valve (PCGV) is a novel globe valve with a piston-type valve core and a small pilot valve. It can utilize a pressure difference to control the state of the main valve by the pilot valve. In this paper, a mathematical model of PCGV is established and a computational fluid dynamics (CFD) method is used to numerically simulate its flow and cavitation characteristics. Analysis of the pressure difference between the upside and downside of the valve core and comparison with similar previous work increase the reliability of the simulation. Then an analysis of flow and cavitation characteristics is carried out with three comparisons: a comparison between opened and closed states, a comparison between different inlet velocities, and a comparison between different valve core displacements. The results demonstrate that the vapor volume fraction reaches its peak point at the valve seat near the outlet tube, and that a higher inlet velocity or smaller valve core displacement can cause greater cavitation damage. This study can help further design work for optimization and engineering applications of PCGV.

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Numerical Modelling of Cavitation: Validation and Parametric Studies

Cited by 24 publications

References 16 publications

Effects of an adiabatic fin on the mixed convection heat transfer in a square cavity with two ventilation ports

Effects of an adiabatic fin on the mixed convection heat transfer in a square cavity with two ventilation ports

A comprehensive study on the effect of cavitation on injection velocity in diesel nozzles

Numerical analysis of flow and cavitation characteristics in a pilot-control globe valve with different valve core displacements

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