Validation of full cavitation model in cryogenic fluids

Cao, XiaoLi; Zhang, Xiaobin; Qiu, Limin; Gan, Zhihua

doi:10.1007/s11434-009-0253-9

Cited by 23 publications

(9 citation statements)

References 18 publications

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“…Overall, the agreement with experimental data in the case 349 is better in terms of the surface temperature than pressure. The pressure profiles inside the cavity and particularly in the closure regions are more inconsistent and showing larger differences, but it is better than the results of Cao [10] . Fig.6 shows that the maximum pressure depression is 22.54%, and the maximum temperature depression is 0.51K.…”

Section: Dcontrasting

confidence: 53%

“…And for the latter, the pressure and temperature predictions showed inconsistent agreement with the experimental data, especially at the cavity closure region. Cao [10] validates Singhal cavitation model in cryogenic cavitation flows and gets the pressure and temperature distribution, but the pressure is not obtained well with the experiment. In the present study, the modified Merkle cavitation model and variable thermal properties of the fluid are realized via a UDF (user defined function) that is compiled and linked to the solver.…”

Section: Introductionmentioning

confidence: 93%

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Thermal Effects on Cryogenic Cavitating Flows around an Axisymmetric Ogive

Shi

Wang

2010

International Journal of Fluid Machinery and Systems

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Cavitation in cryogenic fluids generates substantial thermal effects and strong variations in fluid properties, which in turn alter the cavity characteristics. In order to investigate the cavitation characteristics in cryogenic fluids, numerical simulations are conducted around an axisymmetric ogive in liquid nitrogen and hydrogen respectively. The modified Merkle cavitation model and energy equation which accounts for the influence of cavitation are used, and variable thermal properties of the fluid are updated with software. A good agreement between the numerical results and experimental data are obtained. The results show that vapor production in cavitation extracts the latent heat of evaporation from the surrounding liquid, which decreases the local temperature, and hence the local vapor pressure in the vicinity of cavity becomes lower. The cavitation characteristics in cryogenic fluids are obtained that the cavity seems frothy and the cavitation intense is lower. It is also found that when the fluid is operating close to its critical temperature, thermal effects of cavitation are more obviously in cryogenic fluids. The thermal effect on cavitation in liquid hydrogen is more distinctively compared with that in liquid nitrogen due to the changes of density ratio, vapour pressure gradient and other variable properties of the fluid.

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Section: Dcontrasting

confidence: 53%

Section: Introductionmentioning

confidence: 93%

Thermal Effects on Cryogenic Cavitating Flows around an Axisymmetric Ogive

Shi

Wang

2010

International Journal of Fluid Machinery and Systems

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“…Another popular approach is the transport equation-based model (TEM) [7][8][9][10][11][12]. The transport equation for either mass or volume fraction is solved, with appropriate source terms to regulate the mass between phases in the TEM.…”

mentioning

confidence: 99%

“…Merkle et al [8] and Kunz et al [9] em-ployed the artificial compressibility method with special attention given to the preconditioning formulation. Singhal et al [10] and Cao et al [11] considered the effect of noncondensable gas in their "full cavitation model". Senocak and Shyy [12] developed an interfacial dynamics-basedcavitation model (IDM), which offers direct interpretation of the empirical parameters in the existing transport-equationbased models.…”

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confidence: 99%

A modified density based cavitation model for time dependent turbulent cavitating flow computations

Huang

Wang

2011

Chin. Sci. Bull.

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The predictive capability of transport equation-based cavitation models including the Kubota cavitation model (Model-1) and interfacial dynamics cavitation model (Model-2), is evaluated for the attached turbulent cavitating flows. In this study, the test problem is the unsteady cloud cavitating flows around a Clark-Y hydrofoil. Based on the evaluations of existing models, we identified the differences between these two vaporization and condensation processes in the affected region, and provided a modified density based cavitation model (Model-3). The numerical results of the cavity shapes, velocity distributions and dynamics of the cavity oscillations were compared to existing experimental data. Compared with the other cavitation models, a significant improvement for the numerical results of unsteady cavitating flows has been obtained with the new model. Our study provides the information for further modeling development. CFD, cavitating flows, cavitation model Citation:Huang B, Wang G Y. A modified density based cavitation model for time dependent turbulent cavitating flow computations.

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“…Study of bubble growth in an extensive pool of liquid provides considerable insight into the mechanisms that play a role in bubble growth near heated surfaces and in the cavitation phenomenon [1][2][3]. If a liquid in a large container is uniformly heated under constant pressure, when the temperature approaches saturation corresponding to the pressure, its surface will begin to boil.…”

mentioning

confidence: 99%

Effects of surface tension on bubble growth in an extensive uniformly superheated liquid

et al. 2011

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The study of bubble growth in an extensive pool of liquid provides considerable insight into the mechanisms that play a role in bubble growth near a heated surface and in the cavitation phenomenon. This work focuses on analyzing the effects of surface tension on the growth rate for the thermally controlled stage of a single bubble in such a liquid. The conservation of energy equations, including the internal energy term for the bubble and that within boundary layer around it, are numerically solved. The complete temporal variations of the bubble in water and liquid nitrogen are investigated based on the assumption that the bubble growth is controlled only in sequence by inertia and heat. Thus, the two stages are subject to the continuity of the bubble growth, while the inertia-controlled stage is only formulated by the well-known Rayleigh solution. The thickness of the boundary layer around the bubble is also determined. The results are comparable with the Plesset-Zwick models and Forster-Zuber models, as well as available experimental data. It is found that the influence of internal energy on the rate of bubble growth is small enough to be ignored; however, the accumulative effects of the surface tension are significant and increase with a decrease in the degree of superheat.

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Validation of full cavitation model in cryogenic fluids

Cited by 23 publications

References 18 publications

Thermal Effects on Cryogenic Cavitating Flows around an Axisymmetric Ogive

Thermal Effects on Cryogenic Cavitating Flows around an Axisymmetric Ogive

A modified density based cavitation model for time dependent turbulent cavitating flow computations

Effects of surface tension on bubble growth in an extensive uniformly superheated liquid

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