Plastic deformation and modification of surface characteristics in nano- and micro-levels and enhancement of electric field of FCC materials using cavitation phenomenon

Hutli, Ezddin; Bonyár, Attila; Oszetzky, Dániel; Nedeljković, Miloš

doi:10.1016/j.mechmat.2015.10.006

Cited by 17 publications

(10 citation statements)

References 15 publications

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“…In order to improve the performance of high speed waterjet while at the same time keep the supplying pressure relatively low, cavitating and pulsed waterjets have been put forward. In terms of a cavitating waterjet, the collapse of cavitation bubbles in the free shear layer produces not only mechanical impact but also high temperature spots, which can cause serious damage to the nearby solid surface [4][5][6] . For a pulsed waterjet, the highly enhanced destructive effect comes from the high-intensity and short-duration water hammers with transient pressure pulses caused by a series of discrete water slugs [7] .…”

Section: Introduction mentioning

confidence: 99%

Effects of area discontinuity at nozzle inlet on the characteristics of self-resonating cavitating waterjet

Kang

Ding

et al. 2016

Chin. J. Mech. Eng.

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The current research on self-resonating cavitating waterjet(SRCW) mainly focuses on the generation mechanism and structure optimization. Researches relating to the influences of disturbances at nozzle inlet on the characteristics of the jet are rarely available. In order to further improve the performance of SRCW, effects of area discontinuity(enlargement and contraction) are experimentally investigated using three organ-pipe nozzles. Axial pressure oscillation peak and amplitude as well as aggressive erosion intensity of the jet are used to evaluate the effects. The results reveal that area enlargement and contraction affect the peak differently, depending on the inlet pressure, nozzle geometry, and standoff distance; while area contraction always improves the amplitude regardless of these factors. At inlet pressures of 10 MPa and 20 MPa, area discontinuity improves the peak at almost all the testing standoff distances, while this only happens at smaller standoff distances with the inlet pressure increased to 30 MPa. The capability of area discontinuity for improving the amplitude is enhancing with increasing inlet pressure. Moreover, the cavitation erosion ability of the jet can be largely enhanced around the optimum standoff distance, depending on the type of area discontinuity and nozzle geometry. A preliminary analysis of the influence of area discontinuity on the disturbance waves in the flow is also performed. The proposed research provides a new method for effectively enhancing the performance of SRCW.

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Section: Introduction mentioning

confidence: 99%

Effects of area discontinuity at nozzle inlet on the characteristics of self-resonating cavitating waterjet

Kang

Ding

et al. 2016

Chin. J. Mech. Eng.

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“…We demonstrated that cavitation could be utilized as a tool to purposefully modify the surface characteristics of these materials (in other worlds increase their surface roughness in a controllable fashion) in the micro-and nano-levels [52,53]. The relation between the behavior of the cavitation erosion process and the geometrical parameters of the generator (e.g.…”

Section: Micro-and Nano-scale Materials Characterizationmentioning

confidence: 99%

BME VIK Annual Research Report on Electrical Engineering and Computer Science 2016

Charaf

Harsányi

Poppe

et al. 2017

Period. Polytech. Elec. Eng. Comp. Sci.

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Preface Since being established in 1949, the Faculty of Electrical Engineering and Informatics (VIK) BME has played a flagship role in the development of electronics, IT and computer science in Hungary.We László Jakab (dean, BME VIK) János Levendovszky (vice-dean in charge of scientific affairs, BME VIK) are proud of combining engineering applications with sound scientific results, which is the assurance of high-level industrial collaboration leading to novel results and innovation. The various collaborations with our industrial partners has made it clear that the industry expects methods and results which make their industrial processes more effective and increase productivity and quality. Thus, participation in these collaborations give a competitive edge and ensure the continuous development of VIK. These factors have positioned our Department of Automation and Applied InformaticsDepartment of Automation and Applied Informatics (AUT) is one of the largest and dynamically developing departments at BME with diverse scope competences such as control theory, embedded systems, software modelling, applied software development, Internet of Things, power electronics, mechatronics, and many others. The department's main activities are education, research and development. Training versatile electrical and software engineers with solid practical knowledge is our top priority. Our profile also includes developing high quality software and hardware solutions for industry partners. All of our activities are backed by strong research background.In 2016, the department organized and hosted a number of domestic and international events. In cooperation with the industry, AUT has organized the IoT4U conference. It was dedicated to Internet of Things, cloud and data management as well as the integration of IoT into various formats. RobonAUT, the yearly domestic amateur robotics contest was organized by the department in February 2016. The yearly contest is open to teams of students, organized either in student projects within the department or independent research teams.The next sections summarize the key research results of the department in year 2016. Software Development Methods and Mobile PlatformsThe diversity of mobile platforms necessitates the development of the same mobile application for all major mobile platforms, what requires considerable development effort. Mobile application developers are multiplatform developers, but they still prioritize the platforms, therefore, not all platforms are equally important for them. Appropriate methods, processes and tools are required to support the development in order to achieve better productivity.The research on educational mobile applications that adapt to the mental state of the user required a method for estimating the difficulty of tasks found in the serious games. There are generated or random assignments where the effort required from the user is not known or cannot be estimated in advance.61 (2) IoT and Smart CityThe Internet of Things (IoT) is transforming the surroun...

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“…On the other hand, the destructive power of cavitation can be deliberately used to modify and enhance the surface or mechanical properties of target materials, e. g. for cleaning, cutting or peening with relatively low energy consumption. Cavitating water jets have received much attention also in the environmental industry for the possibility to use them for the decomposition of toxic substances and the water treatment [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Until now many experimental --------------studies on cavitating water jets have been made concerning jet driven pressure, shape and size of a nozzle, cavitation number, etc. [1,2,[5][6][7]. However, the structure of the cavitating jet and the behavior of the unsteady cavitation bubbles are still in question, mostly due to the difficulty to observe the interior of cavitating flows [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…If the relationship between the cavitation intensity and the cavitation damage of materials would be investigated precisely, the key parameter for the prediction of the cavitation damage stages (plastic, crackers, erosion, etc.) may be clarified [5,7,12]. The flow through a nozzle can be controlled by the operating conditions, orifice geometry, and flow properties.…”

Section: Introductionmentioning

confidence: 99%

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Study and analysis of the cavitating and non-cavitating jets - Part two: Parameters controlling the jet action and a new formula for cavitation number calculation

2020

Self Cite

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This part of the paper presents the relation between the working conditions, nozzle geometry, nozzle diameter, and jet behavior. Experimental work has been made by impinging the submerged jets on the copper specimen as a target for a period of time. The mass loss and erosion rate at various conditions were measured, calculated and analyzed. For the visualization, a high-speed camera was used and the obtained data were processed to measure parameters which are used to characterize the clouds. Correlations among the jet dynamic power, the cavity length, erosion rate, and the pertinent experimental parameters are apparent. In addition, formulas are proposed to conveniently compare the efficiency of jetting systems based on working conditions. Based on the mathematical analyses of the obtained results a new form for cavitation number calculation is proposed.

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Plastic deformation and modification of surface characteristics in nano- and micro-levels and enhancement of electric field of FCC materials using cavitation phenomenon

Cited by 17 publications

References 15 publications

Effects of area discontinuity at nozzle inlet on the characteristics of self-resonating cavitating waterjet

Effects of area discontinuity at nozzle inlet on the characteristics of self-resonating cavitating waterjet

BME VIK Annual Research Report on Electrical Engineering and Computer Science 2016

Study and analysis of the cavitating and non-cavitating jets - Part two: Parameters controlling the jet action and a new formula for cavitation number calculation

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