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

Mlela, Masoud Kamoleka; Xu, He; Sun, Feng; Wang, Haihang; Madenge, Gabriel Donald

doi:10.3390/ma13020453

Cited by 15 publications

(7 citation statements)

References 47 publications

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“…The choice of this set was dictated by the properties and popularity of these methods. These methods and their modifications found an application in many different domains such as sustainability assessment [34][35][36], logistics [37][38][39], supplier selection [7,40,41], manufacturing [42][43][44], environment management [45][46][47], waste management [48,49], energy management [50][51][52][53][54][55], chemical engineering [56][57][58], and many more [59,60]. The choice of a group of TOPSIS, VIKOR, and COPRAS methods is justified, as they form a coherent group of methods of the American MCDA school and are based on the same principles, using the concepts of the so-called reference points.…”

Section: Introductionmentioning

confidence: 99%

Are MCDA Methods Benchmarkable? A Comparative Study of TOPSIS, VIKOR, COPRAS, and PROMETHEE II Methods

2020

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Multi-Criteria Decision-Analysis (MCDA) methods are successfully applied in different fields and disciplines. However, in many studies, the problem of selecting the proper methods and parameters for the decision problems is raised. The paper undertakes an attempt to benchmark selected Multi-Criteria Decision Analysis (MCDA) methods. To achieve that, a set of feasible MCDA methods was identified. Based on reference literature guidelines, a simulation experiment was planned. The formal foundations of the authors’ approach provide a reference set of MCDA methods ( Technique for Order Preference by Similarity to Ideal Solution (TOPSIS), VlseKriterijumska Optimizacija I Kompromisno Resenje (VIKOR), Complex Proportional Assessment (COPRAS), and PROMETHEE II: Preference Ranking Organization Method for Enrichment of Evaluations) along with their similarity coefficients (Spearman correlation coefficients and WS coefficient). This allowed the generation of a set of models differentiated by the number of attributes and decision variants, as well as similarity research for the obtained rankings sets. As the authors aim to build a complex benchmarking model, additional dimensions were taken into account during the simulation experiments. The aspects of the performed analysis and benchmarking methods include various weighing methods (results obtained using entropy and standard deviation methods) and varied techniques of normalization of MCDA model input data. Comparative analyses showed the detailed influence of values of particular parameters on the final form and a similarity of the final rankings obtained by different MCDA methods.

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Section: Introductionmentioning

confidence: 99%

Are MCDA Methods Benchmarkable? A Comparative Study of TOPSIS, VIKOR, COPRAS, and PROMETHEE II Methods

2020

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“…Liang et al [12] and Han et al [13] investigated the cavitation phenomenon in a water-hydraulic valve through the CFD simulation based on the realizable k-ε turbulence model. Xu et al [14] and Mlela et al [15] optimized the structure of a water-hydraulic valve to decrease the erosion effect of cavitation through the CFD simulation. The RNG k-ε turbulence model with 30 μm wall roughness height was selected to conduct the simulation.…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis and Experimental Research on Mechanical Properties of Water-Hydraulic Ball Valve

Yang

Zhang

Chen

et al. 2022

Preprint

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The working performance of a hydraulic system depends on the control valves, and the working performance of the control valves depends on their mechanical properties. Compared with the oil-hydraulic control valves, the water-hydraulic control valves are featured by strict sealing requirements, poor lubricity, and more complicated friction properties . In order to precisely control the valves, the fluid force and friction acting on the valve core are investigated through the methods of finite element analysis and experimental research. The results show that the realizable k-ε turbulence model with an appropriate wall roughness height could accurately reflect the state of fluid force. The fluid force increases as the valve opening and the pressure difference increase. Moreover, the friction is affected by the motion state of the valve core, and the reason is investigated. In addition, the phenomenon of mechanical properties variation is discussed, and an assumption is presented to explain the causation. This research can help understand some mechanical properties of water hydraulic valves and establish a more accurate mechanical model. Furthermore, the study also has guiding significance for controlling water hydraulic valves.

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“…They believe that the polymer chain may have different configurations in space that contribute to better or worse stability in research, based on its length. Mlela et al [7] aimed to match Cr 2 O 3 , Al 2 O 3 , and Ti 2 O 3 with the most appropriate polymer coating. Through using the Preference Ranking Organization Method for Enrichment Evaluations (PROMETHEE), the most robust obtained polymer in a watery environment valve with an evaluated efficiency attribute is polytetrafluoroethylene with a greater outranking (0.5932052).…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Study of Anti-Wear Erosion and Corrosion Protection of PTFE/Al2O3 (010) Coating Composite in Water Hydraulic Valves

Mlela

Wang

2020

Coatings

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Cavitation erosion and corrosion commonly occur on the surface of fluid dynamic system components, mostly water hydraulic valves, causing the failure of metal parts. Coating of polytetrafluoroethylene (PTFE) on Al2O3 (010) was created by varying the chain length of polytetrafluoroethylene. Calculations were conducted by molecular dynamic (MD) simulations. This study shows that the K10 and K20 chain lengths’ mechanical properties possess negative elastic, shear, and bulk modulus values. We have found that the K10 chain length composition shows the high results of binding energy and negative bulk modulus of 6267.16 kJ/mol and −3709.54 GPa, respectively. The K10 chain length was observed to possess a higher cohesive energy density (CED) and solubility parameter of (6.885 ± 0.00076) × 109 J/m3 and (82.974 ± 0.005) (J/cm3)0.5, respectively. It was also found that increasing the chain length contributes to decreasing the binding energy and solubility parameter of PTFE/Al2O3 (010) composition. These results are vital for overcoming the repetitive regime of high compressive strength of water microjets on the valves’ material surface. Improved values of the cohesive energy density and solubility parameters imply the water’s superior hydrophobic effect.

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

Cited by 15 publications

References 47 publications

Are MCDA Methods Benchmarkable? A Comparative Study of TOPSIS, VIKOR, COPRAS, and PROMETHEE II Methods

Are MCDA Methods Benchmarkable? A Comparative Study of TOPSIS, VIKOR, COPRAS, and PROMETHEE II Methods

Simulation Analysis and Experimental Research on Mechanical Properties of Water-Hydraulic Ball Valve

Molecular Dynamics Study of Anti-Wear Erosion and Corrosion Protection of PTFE/Al2O3 (010) Coating Composite in Water Hydraulic Valves

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