A numerical investigation in characteristics of flow force under cavitation state inside the water hydraulic poppet valves

Han, Mingxing; Liu, Yinshui; Wu, Defa; Zhao, Xufeng; Tan, Huaijiang

doi:10.1016/j.ijheatmasstransfer.2017.03.100

Cited by 82 publications

(48 citation statements)

References 21 publications

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“…The periodic layer of the amorphous polytetrafluoroethylene cell (PTFE) was constructed and the structure was geometrically refined from the atactic polymer used in this work. This was pre-constructed, manufactured from the 50-chain length repeat-unit tetrafluoroethylene with a number of configurations set to 1.0, the final design goal density agreed to 2 g/cm 3 . The next step was to build a layer with a vacuum of 70 × 10 −10 m. Minimized polytetrafluoroethylene was deposited on the matched metal oxide slabs of Cr 2 O 3 , Al 2 O 3 , and Ti 2 O 3 .…”

Section: Molecular Dynamics Simulation To Predict the Substrate And Smentioning

confidence: 99%

“…They also have a lower viscosity (less than 1/30 at 50 • C mineral oil) and higher specific heat capacity (multiple of 2.2 higher than mineral oil). All of the above benefits make water hydraulics particularly interesting for robotics for high-performance actuation techniques, in addition to improving people's awareness of environmental protection and sustainable development requirements [2][3][4][5]. Hydraulic systems that utilize water as a pressure medium could be the correct solution for the environmental and safety problems of most oil hydraulic systems [6].…”

Section: Introductionmentioning

confidence: 99%

“…Hydraulic systems that utilize water as a pressure medium could be the correct solution for the environmental and safety problems of most oil hydraulic systems [6]. Water hydraulic systems have been widely used in the fields of steel and glass production, ocean exploration, food and medicine processing, and coal mining [3,7]. Water-based systems are highly and time-consuming task because of the presence of a large number of materials with different attributes.…”

Section: Introductionmentioning

confidence: 99%

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Material Analysis and Molecular Dynamics Simulation for Cavitation Erosion and Corrosion Suppression in Water Hydraulic Valves

Mlela

Sun

et al. 2020

Materials

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In the milestone of straggling to make water hydraulics more advantageous, the choice of coating polymer for water hydraulics valves plays an essential role in alleviating the impact of cavitation erosion and corrosion, and this is a critical task for designers. Fulfilling the appropriate selection, we conflicted properties that are vital for erosion and corrosion inhibitors, as well as the tribology in the sense of coefficient of friction. This article aimed to choose the best alternative polymer for coating on the selected substrate, that is, Cr2O3, Al2O3, Ti2O3. By applying PROMETHEE (Preference Ranking Organization Method for Enrichment Evaluations), the best polymer obtained with an analyzed performance attribute is Polytetrafluoroethylene (PTFE) that comes up with higher outranking (0.5932052). A Molecular Dynamics (MD) simulation was conducted to identify the stronger bonding with the regards of the better cleave plane between Polytetrafluoroethylene (PTFE) and the selected substrate. Polytetrafluoroethylene (PTFE)/Al2O3 cleaved in (010) plane was observed to be the strongest bond in terms of binding energy (3188 kJ/mol) suitable for further studies.

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Section: Molecular Dynamics Simulation To Predict the Substrate And Smentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Material Analysis and Molecular Dynamics Simulation for Cavitation Erosion and Corrosion Suppression in Water Hydraulic Valves

Mlela

Sun

et al. 2020

Materials

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“…Computational Fluid Dynamics (CFD) is generally used for modeling and approximating the Navier-Stokes Equations to characterize flow through a valve. CFD analysis performed on poppet valves has been used to predict the behavior of these valves with relative errors below 8% [26,27]. Nevertheless, it is important to note that is has also been demonstrated that errors are related to many factors, such as geometry and that some configurations are more challenging for the mathematical models [28].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Design of a Poppet Valve by Transitory Simulation

et al. 2019

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This article contains the results and analysis of the dynamic behavior of a poppet valve through CFD simulation. A computational model based on the finite volume method was developed to characterize the flow at the interior of the valve while it is moving. The model was validated using published data from the valve manufacturer. This data was in accordance with the experimental model. The model was used to predict the behavior of the device as it is operated at high frequencies. Non-dimensional parameters for generalizing and analyzing the effects of the properties of the fluid were used. It was found that it is possible to enhance the dynamic behavior of the valve by altering the viscosity of the working fluid. Finally, using the generated model, the influence of the angle of the poppet was analyzed. It was found that angle has a minimal effect on pressure. However, flow forces increase as angle decreases. Therefore, reducing poppet angle is undesirable because it increases power requirements for valve actuation.

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“…Under the cavitation condition, pressure variation from cavitation behavior generates a large fluctuation in flow force, and thus causes difficulties in control stability (Amirante, Distaso, & Tamburrano, 2014). Han, Liu, Wu, Zhao, and Tan (2017) performed a numerical study on cavitation effect on flow force due to cavitating flow inside a poppet valve. The results revealed that flow force under the condition of cavitation is highly dependent on geometric structure, and a two-stage configuration is superior in cavitation suppression but suffers from larger flow force.…”

Section: Introductionmentioning

confidence: 99%

Comparison of compressible and incompressible numerical methods in simulation of a cavitating jet through a poppet valve

Yuan

Jun

Liu

2018

Engineering Applications of Computational Fluid Mechanics

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The regime of compressible flow generally refers to the super/subsonic case. However, several remarkable cases with low Mach number could not be appropriately described with the incompressible method. It is a similar case for a cavitating jet inside a poppet valve. In order to comprehensively address the discrepancy between incompressible and compressible methods, both non-cavitating and cavitating cases are performed in experiment and calculation based on OpenFOAM. Experiment reveals a transition in flow pattern in both non-cavitating and cavitating flow. For example, for 0.7 mm openness and 30-degree poppet angle, transition happens at approximately 29 and 27 bar pressure drop for the two cases, respectively. In general, results from the compressible method exhibit better agreement with experiment regarding both flow performance and flow structure. By contrast, the incompressible method could not provide an accurate description for the transition process under the applied flow condition. A series of studies are carried out with emphasis on such discrepancy. Firstly, the deviation in flow performance is addressed based on velocity profile and turbulence level. Secondly, the disparity in flow structure is illustrated and the mechanism for cavitation inception is discussed, which combined provide an interpretation of the deficiency of the incompressible method. Thirdly, different inlet boundary conditions are applied, and the results confirm the independence of deficiency of the incompressible method for inlet fluctuation. Finally, a re-examination is proposed concerning traditional notion of compressible flow as well as the applicability of incompressible numerical method.

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A numerical investigation in characteristics of flow force under cavitation state inside the water hydraulic poppet valves

Cited by 82 publications

References 21 publications

Material Analysis and Molecular Dynamics Simulation for Cavitation Erosion and Corrosion Suppression in Water Hydraulic Valves

Material Analysis and Molecular Dynamics Simulation for Cavitation Erosion and Corrosion Suppression in Water Hydraulic Valves

Analysis of the Design of a Poppet Valve by Transitory Simulation

Comparison of compressible and incompressible numerical methods in simulation of a cavitating jet through a poppet valve

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