On the Mechanism of Head Breakdown in Cavitating Inducers

Jakobsen, Jakob

doi:10.1115/1.3653066

Cited by 59 publications

(26 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally, we should mention one other process that may be at work in the closure region. In the case of predominantly vapor-filled cavities Jakobsen (1964) has suggested that a condensation shock provides a mechanism for cavity closure (simple shocks of this kind were analysed in Section 6.9). This last suggestion deserves more study than it has received to date.…”

mentioning

confidence: 99%

Cavitation and Bubble Dynamics

Brennen

2013

1,048

597

View full text Add to dashboard Cite

Cavitation and Bubble Dynamics deals with the fundamental physical processes of bubble dynamics and the phenomenon of cavitation. It is ideal for graduate students and research engineers and scientists, and a basic knowledge of fluid flow and heat transfer is assumed. The analytical methods presented are developed from basic principles. The book begins with a chapter on nucleation and describes both the theory and observations in flowing and non-flowing systems. Three chapters provide a systematic treatment of the dynamics and growth, collapse, or oscillation of individual bubbles in otherwise quiescent fluids. The following chapters summarise the motion of bubbles in liquids, describe some of the phenomena that occur in homogeneous bubbly flows, with emphasis on cloud cavitation, and summarise some of the experimental observations of cavitating flows. The last chapter provides a review of free streamline methods used to treat separated cavity flows with large attached cavities.

show abstract

mentioning

confidence: 99%

Cavitation and Bubble Dynamics

Brennen

2013

1,048

597

View full text Add to dashboard Cite

show abstract

“…The velocity of the reentrant motion is estimated about V j = 13.4 m/s ± 1.2 m/s from the slope of the line C as just mentioned before. The velocity V s at an attached cavity surface, on the other hand, was approximated by Jakobsen [12] based on the Bernoulli's theorem as follow,…”

Section: Image Analysis Results For Unsteady Behavior Of Cloud Cavitamentioning

confidence: 99%

“…Kawanami et al [11] reported that an obstacle was installed on a hydrofoil surface to stop the reentrant motion from flowing toward its leading edge and obtained the result on the suppression of a large cloud shedding and the reduction of cavitation noise. However, some researchers suggested that there can be other mechanisms for the reentrant motion, such as existence of a condensation shock [12] and a collapse of cloud with a shock wave [13]. Thus the cause of the reentrant motion has yet to be completely elucidated.…”

Section: Introductionmentioning

confidence: 99%

Unsteady Behavior of Cavitating Waterjet in an Axisymmetric Convergent-Divergent Nozzle: High Speed Observation and Image Analysis Based on Frame Difference Method

Hayashi¹,

Sato²

2014

JFCMV

View full text Add to dashboard Cite

Although it is well known that cloud cavitation shows unsteady behavior with the growing motion of an attached cavity, the shedding motion of a cloud, the collapsing motion of the cloud shed downstream and a reentrant motion in flow fields such as on a 2-D hydrofoil and in a convergentdivergent channel with a rectangular cross-section, observations for the periodic behavior of cloud cavitation in a cylindrical nozzle with a convergent-divergent part, which is mainly used in an industrial field, have hardly been conducted. From engineering viewpoints, it is important to elucidate the mechanism of periodic cavitation behavior in a cylindrical nozzle. In this study, a high-speed observation technique with an image analysis technique was applied to the cloud cavitation behavior in the nozzle to make clear the mechanism of unsteady behavior. As a result, it was observed in the nozzle that the periodic behavior occurs in the cloud cavitation and pressure waves form at the collapse of clouds shed downstream. Also, it was found through the image analysis based on the present technique that the pressure wave plays a role as a trigger mechanism to cause a reentrant motion at the downstream end of an attached cavity.

show abstract

“…Actually, the speed of sound in a two-phase mixture is about a hundred or a thousand times smaller than in pure vapor or liquid, respectively. 35 In order to better understand the behavior of the cavitating turbulent structures, it was necessary to discriminate the compressibility effect and the vapor phase effects. For this reason, the present study attempts to compare the compressibility effect on one-phase supersonic mixing layers to that on this cavitating mixing layer.…”

Section: B Cavitating Shear Layermentioning

confidence: 99%

Velocity field analysis in an experimental cavitating mixing layer

2011

View full text Add to dashboard Cite

International audienceThe present study was carried out on a 2D shear layer test bed where no wall effect interfered with the flow. The objective was to obtain refined database and informations concerning the behavior of the liquid phase under different cavitation levels. This reference test has provided us a well documented test case to be used for numerical simulations of the complex turbulent two-phase flow and in order to quantify the turbulence-cavitation interactions

show abstract

On the Mechanism of Head Breakdown in Cavitating Inducers

Cited by 59 publications

References 0 publications

Cavitation and Bubble Dynamics

Cavitation and Bubble Dynamics

Unsteady Behavior of Cavitating Waterjet in an Axisymmetric Convergent-Divergent Nozzle: High Speed Observation and Image Analysis Based on Frame Difference Method

Velocity field analysis in an experimental cavitating mixing layer

Contact Info

Product

Resources

About