scholarly journals A new cavitation model based on bubble-bubble interactions

2018 ◽  
Vol 30 (12) ◽  
pp. 123301 ◽  
Author(s):  
M. Adama Maiga ◽  
O. Coutier-Delgosha ◽  
D. Buisine
Keyword(s):  
Cavitation Model ◽  
Bubble Interactions ◽  
Model Based

A New Cavitation Model Based on Evaporation and Condensation Theory

2009 ◽  
Author(s):  
Gang Chen ◽  
Shuhong Liu ◽  
Guangjun Cao ◽  
Yulin Wu ◽  
Suhong Fu ◽  
...  
Keyword(s):  
Surface Tension ◽  
Aerodynamic Drag ◽  
Water Pressure ◽  
Bubble Diameter ◽  
Simulation Models ◽  
Cavitation Model ◽  
Local Pressure ◽  
Two Phase ◽  
Evaporation And Condensation ◽  
Model Based

Cavitation is a phenomenon which occurs where the local pressure falls off under the vapor pressure. Over the past few years, numerical simulation models for cavitation have been developed significantly in order to investigate the mechanism of cavitation. In the paper, A local homogeneous cavitation model based on the theory of evaporation and condensation has been deduced, which is used to describe the phase change between water and vapor. The RNG k–ε turbulence model is used to simulate the turbulent flow and the finite volume method is employed to discrete the governing equations. The effects of surface tension of water, pressure fluctuations and non-condensable gases are included in the mass transfer cavitation model. Also in order to neglect the effects of the quantities such as the bubble number and bubble diameter, which is difficult to measure, the relations between the aerodynamic drag and surface tension forces is used to describe the bubble diameter. In order to evaluate the new cavitation model, the two phase cavitation flows around a NACA0015 hydrofoil at different attack angle and different cavitation number are simulated by the new cavitation model, and compared with references, which showed good agreement with the experiments.

scholarly journals Surrogate model-based strategy for cryogenic cavitation model validation and sensitivity evaluation

2008 ◽  
Vol 58 (9) ◽  
pp. 969-1007 ◽  
Author(s):  
Tushar Goel ◽  
Siddharth Thakur ◽  
Raphael T. Haftka ◽  
Wei Shyy ◽  
Jinhui Zhao
Keyword(s):  
Model Validation ◽  
Surrogate Model ◽  
Cavitation Model ◽  
Model Based ◽  
Sensitivity Evaluation

Cavitation in Hydraulic Tools Based on Thermodynamic Properties of Liquid and Gas

2002 ◽  
Vol 124 (4) ◽  
pp. 1011-1017 ◽  
Author(s):  
U. Iben ◽  
F. Wrona ◽  
C.-D. Munz ◽  
M. Beck
Keyword(s):  
Thermodynamic Properties ◽  
Mass Flow ◽  
Wave Motion ◽  
Cavitation Model ◽  
Model Based ◽  
Physical Phenomena

The simulation of cavitation phenomena plays an important role for development of modern hydraulic tools and injection systems. Cavitation leads to a reduction of mass flow and influences the wave motion in hydraulic components significantly. The article deals with the simulation of a homogeneous cavitation model based on thermodynamic properties of the liquid and steam to understand basic physical phenomena.

Cavitation Mechanism of Oil-Film Bearing and Development of a New Gaseous Cavitation Model Based on Air Solubility

2012 ◽  
Vol 134 (3) ◽  
Author(s):  
Xue-song Li ◽  
Yin Song ◽  
Zeng-rong Hao ◽  
Chun-wei Gu
Keyword(s):  
Reynolds Equation ◽  
Journal Bearing ◽  
Published Data ◽  
Cavitation Model ◽  
Heavy Load ◽  
New Model ◽  
Oil Film ◽  
Model Based ◽  
Cavitation Phenomenon ◽  
Good Agreement

Cavitation phenomenon in lubricants significantly influences the performance of associated machinery. In this paper, the cavitation mechanism of an oil-film bearing is attributed to gaseous cavitation, and a new gaseous cavitation model based on air solubility in the lubricant is presented. The model is validated using the Reynolds equation algorithm for fixed-geometry oil-film journal bearing, and the predicted results at different eccentricity ratios show good agreement with published data. The analyses show that gaseous mechanism can explain the cavitation phenomena that occur in the bearing except for very heavy load cases. In particular, this new model is compatible with the Jakobsson–Floberg–Olsson condition. Therefore, the new model has an explicit physical meaning, can produce good results, can identify whether vaporous cavitation occurs, and more importantly, can provide a novel means of developing cavitation models for low-vapor-pressure lubricants.

Numerical Prediction of Impact Force in Cavitating Flows

2010 ◽  
Vol 132 (10) ◽  
Author(s):  
Hong Wang ◽  
Baoshan Zhu
Keyword(s):  
Numerical Method ◽  
Cavitation Bubble ◽  
Bubble Dynamics ◽  
Impact Force ◽  
Quantitative Agreement ◽  
Bubble Collapse ◽  
Cavitating Flows ◽  
Cavitation Model ◽  
Model Based ◽  
The Impact

A numerical method including a macroscopic cavitation model based on the homogeneous flow theory and a microscopic cavitation model based on the bubble dynamics is proposed for the prediction of the impact force caused by cavitation bubble collapse in cavitating flows. A large eddy simulation solver, which is incorporated with a macroscopic cavitation model, is applied to simulate the unsteady cavitating flows. Based on the simulated flow field, the evolution of the cavitation bubbles is determined by a microscopic cavitation model from the resolution of a Rayleigh–Plesset equation including the effects of the surface tension, the viscosity and compressibility of fluid, the thermal conduction and radiation, the phase transition of water vapor at the interface, and the chemical reactions. The cavitation flow around a hydrofoil is simulated to validate the macroscopic cavitation model. A good quantitative agreement is obtained between the prediction and the experiment. The proposed numerical method is applied to predict the impact force at cavitation bubble collapse on a KT section in cavitating flows. It is found that the shock pressure caused by cavitation bubble collapse is very high. The impact force is predicted qualitatively compared with the experimental data.

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