Measurements of Cavitation Inception.

Sato, Keiichi; Kakutani, Kazuto

doi:10.1299/jsmeb.37.306

Cited by 9 publications

(6 citation statements)

References 2 publications

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“…Recently there were many attempts to predict the magnitude of the cavitation erosion for example Pereira et al [12], Matevˇz Dular et al, [13] and Keiichi Sato. [14] Proposed a relation between the volume of transient cavities and its rate of production to the material deformation energy. Finally Hua et al [15] studied the effect of the bubble size on the cavitation erosion.…”

Section: M30mentioning

confidence: 99%

A study on Cavitation erosion and its effect on metals

Hamouda

Aziz

Baz

2020

Engineering Research Journal

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This paper devoted to the mass and volume losses of metals subjected to cavitation. It studies the Relation between the Cavitation index, operating condition, time elapsed and the mass loss. Three venturies with different throttling area were used to generate cavitation. Aluminum sheet (0.9 mm) and stainless steel sheet were subjected to the cavitation and they were weighted before and after the experiment using 0.001 accuracy Balance. Using the curves in this paper, the life time of the alloy can be predicted. During the experiment the mass loss increased by 25 % when the Cavitation decreased by 30%. And the effect of material hardness and Reynolds number was studied.

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Section: M30mentioning

confidence: 99%

A study on Cavitation erosion and its effect on metals

Hamouda

Aziz

Baz

2020

Engineering Research Journal

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“…As far as the definition of cavitation inception in the fluid is concerned, it is relatively difficult to consider the explosive bubble growth that is accidentally caused by large freestream nuclei and/or large pressure fluctuations as the cavitation inception point [110]. Cavitation inception is verified when repeatable vapour bubble occurrences take place, that is, when the number of vapour bubble occurrences per unit time exceeds a certain threshold value.…”

Section: (A) the Rayleigh-plesset Equation For Single-bubble Dynamicsmentioning

confidence: 99%

“…In the presence of a real liquid, where gaseous nuclei of different sizes exist simultaneously, it is important to consider the fluctuations in the pressure and the number of nuclei with a larger radius than the Blake radius. As far as the definition of cavitation inception in the fluid is concerned, it is relatively difficult to consider the explosive bubble growth that is accidentally caused by large freestream nuclei and/or large pressure fluctuations as the cavitation inception point [110]. Cavitation inception is verified when repeatable vapour bubble occurrences take place, that is, when the number of vapour bubble occurrences per unit time exceeds a certain threshold value.…”

Section: (A) the Rayleigh-plesset Equation For Single-bubble Dynamicsmentioning

confidence: 99%

Fluid dynamics of acoustic and hydrodynamic cavitation in hydraulic power systems

Ferrari¹

2017

Proc. R. Soc. A.

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Cavitation is the transition from a liquid to a vapour phase, due to a drop in pressure to the level of the vapour tension of the fluid. Two kinds of cavitation have been reviewed here: acoustic cavitation and hydrodynamic cavitation. As acoustic cavitation in engineering systems is related to the propagation of waves through a region subjected to liquid vaporization, the available expressions of the sound speed are discussed. One of the main effects of hydrodynamic cavitation in the nozzles and orifices of hydraulic power systems is a reduction in flow permeability. Different discharge coefficient formulae are analysed in this paper: the Reynolds number and the cavitation number result to be the key fluid dynamical parameters for liquid and cavitating flows, respectively. The latest advances in the characterization of different cavitation regimes in a nozzle, as the cavitation number reduces, are presented. The physical cause of choked flows is explained, and an analogy between cavitation and supersonic aerodynamic flows is proposed. The main approaches to cavitation modelling in hydraulic power systems are also reviewed: these are divided into homogeneous-mixture and twophase models. The homogeneous-mixture models are further subdivided into barotropic and baroclinic models. The advantages and disadvantages of an implementation of the complete Rayleigh-Plesset equation are examined.

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“…The experiment was conducted using a closed-type cavitation tunnel [11] with a nozzle-type venturi tube (upstream diameter 40mm, throat diameter 10mm) as shown in Fig. 1.…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

Inception and Dynamics of Traveling-Bubble-Type Cavitation in a Venturi

Sato

Hachino

Saito

2003

Volume 1: Fora, Parts A, B, C, and D

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The inception of cavitation is basically caused by a bubble nucleus which flows into the low pressure region in the liquid flow. Therefore the phenomenon is dependent on the tensile strength or the nuclei concentration of tested water. The cavitation susceptibility of water which controls the cavitation inception point has been made clear though various methods were proposed to measure the nuclei concentration. Cavitation susceptibility meter using a small venturi tube is also one of the methods to measure the nuclei concentration. It is pointed out that this method can be directly related to active nuclei for cavitation inception and gives a useful and simple device to estimate the tensile strength of water. In the present paper, to establish a measurement method of cavitation susceptibility using a venturi tube, the following points are investigated, such as; the relation between the occurrence, count rate of cavitation bubbles and cavitation number, the measurement of positions and local pressure of bubble occurrence and the high-speed video observation of bubble aspects from inception to collapse. As the result, the main points obtained are as follows. A traveling-bubble cavitation appears dominantly in a nozzle-type venturi tube with little possibility of flow separation. Cavitation aspects and the bubble occurrence count rate change with cavitation number and water quality (dissolved gas content). Unstable sheet cavitation can be also observed near the venturi diffuser and at relatively low cavitation number. The various behaviors of traveling bubble cavitation in a venturi are observed from inception to collapse using a high-speed video camera system.

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Measurements of Cavitation Inception.

Cited by 9 publications

References 2 publications

A study on Cavitation erosion and its effect on metals

A study on Cavitation erosion and its effect on metals

Fluid dynamics of acoustic and hydrodynamic cavitation in hydraulic power systems

Inception and Dynamics of Traveling-Bubble-Type Cavitation in a Venturi

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