An improved cavitation model with thermodynamic effect and multiple cavitation regimes

Li, Wenguang; Yu, Zhibin; Kadam, Sambhaji T.

doi:10.1016/j.ijheatmasstransfer.2023.123854

Cited by 13 publications

(3 citation statements)

References 176 publications

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“…Li W.G. et al [16] proposed a new cavitation model that considers thermodynamic effects and is applicable for numerical calculations of various cavitation mechanisms. Moreover, due to the complexity of cavitation mechanisms, the evolution of bubbles is closely related to multiscale vortex motion.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Thermodynamic Effects on the Characteristics of Liquid Nitrogen Cavitating Flow around Hydrofoils

Fu,

Gao,

et al. 2023

Symmetry

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Cryogenic cavitation exhibits complexities primarily represented by the coupled interactions of thermodynamic effects, vortices, and cavities during the cavitation process. To further investigate this coupling mechanism, this study employed the DDES turbulence model and Sauer–Schnerr cavitation model to perform unsteady numerical simulations of liquid nitrogen cavitation flow around the NACA0015 Hydrofoil. Numerical validation of the model utilized a symmetrical Hord hydrofoil. The results reveal that the upstream development of the recirculation flow under inverse pressure gradients is the fundamental cause of the detachment in the primary cavitation region. At a cavitation number of 0.616, thermodynamic effects noticeably suppress the formation of cavities and alter the range of adverse pressure gradients, consequently influencing the detachment behavior in the primary cavitation region.

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Section: Introductionmentioning

confidence: 99%

Study on the Influence of Thermodynamic Effects on the Characteristics of Liquid Nitrogen Cavitating Flow around Hydrofoils

Fu,

Gao,

et al. 2023

Symmetry

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“…These studies are of great significance in industrial production. Li et al [29] developed a cavitation model consisting of vapor bubble growth rate and vapor bubble number density. Surface tension-controlled, inertia-controlled, intermediate, and heat transfer-controlled cavitation regimes are also included in the model.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cavitation on the Heat Transfer of High-Speed Mechanical Seal with Textured Side Wall

Yu,

Peng,

Meng

et al. 2023

Lubricants

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By setting textures on the side walls of a rotor, based on SST k-ω turbulence and the mixture model, the effects of depth-to-diameter ratio, shape, and rotational speed on interface temperature are analyzed. Local Nu number, flow field in textures, and gas distribution are used to verify the conclusion. When rotational speed increases, there are three different stages on the surface: liquid-dominated, mixed two-phase, and gas-dominated. This leads to a big difference in heat transfer on the side wall and causes the temperature on the seal face to increase when cavitation is considered. The distribution of the gas phase is explained through drag reduction, which has a high correlation with the velocity gradient near the surface. For several common shapes, heat transfer enhancement of textures is compared under high speed. The key influencing factor is the depth-to-diameter ratio, which causes flow stratification and reduces heat transfer. Flow stratification leads to different results of maximum temperature on the seal face when cavitation is considered. Results show that at high speed, a deep, circular texture is better when cavitation does not occur, and a shallow triangular texture is recommended when cavitation occurs; a textured side wall can reduce the maximum temperature of the seal face by about 10 °C.

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“…Li W.G. et al [12] proposed a new cavitation model that considers thermodynamic effects and is applicable for numerical calculations of various cavitation mechanisms. Moreover, due to the complexity of cavitation mechanisms, the evolution of bubbles is closely related to multiscale vortex motion.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Thermodynamic Effects on the Characteristics of Liquid Nitrogen Cavitating Flow around Hydrofoils

Fu,

Gao,

et al. 2023

Preprint

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The cavitation behavior of cryogenic liquids in the field of cryogenic engineering is distinct, showcasing fundamental differences from the cavitation behavior observed in ambient temperature water. Cavitation occurrence imposes severe limitations on the operational stability of cryogenic media transportation equipment, leading to safety concerns and increased manufacturing costs. Investigating the spatiotemporal characteristics of cavitation in cryogenic fluids holds significant value for both academia and engineering. The complexity of cavitation in cryogenic fluids primarily manifests through the coupled effects of thermodynamics, vortices, and bubbles during the cavitation process. In order to further explore the coupling mechanism, numerical simulations employing the Delayed Detached Eddy Simulation (DDES) turbulence model and Sauer-Schnerr cavitation model are conducted to validate the accuracy of the numerical calculations using the Hord experiment hydrofoil as a benchmark. Subsequently, the unsteady cavitation flow of liquid nitrogen around the NACA 0015 hydrofoil is simulated by the same numerical calculation method. The results indicate that the simulated results best coincide with experimental results when the bubble number density in the Sauer-Schnerr cavitation model reaches 108. The upstream development of the re-entrant jet under the driving force of inverse pressure gradient is the fundamental reason for the detachment of the primary cavitation zone. Under the same inflow cavitation number, the thermodynamic effect significantly inhibits the generation of bubbles and changes the range of the inverse pressure gradient, thus affecting the separation behavior of the primary cavitation zone.

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An improved cavitation model with thermodynamic effect and multiple cavitation regimes

Cited by 13 publications

References 176 publications

Study on the Influence of Thermodynamic Effects on the Characteristics of Liquid Nitrogen Cavitating Flow around Hydrofoils

Study on the Influence of Thermodynamic Effects on the Characteristics of Liquid Nitrogen Cavitating Flow around Hydrofoils

Influence of Cavitation on the Heat Transfer of High-Speed Mechanical Seal with Textured Side Wall

Study on the Influence of Thermodynamic Effects on the Characteristics of Liquid Nitrogen Cavitating Flow around Hydrofoils

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