Acoustic chamber length performance analysis in ultrasonic pulsating water jet erosion of ductile material

Nag, Akash; Hloch, Sergej; Čuha, Dominik; Dixit, Amit Rai; Tozan, Hakan; Petrů, Jana; Hromasová, Monika; Müller, Miroslav

doi:10.1016/j.jmapro.2019.10.008

Cited by 31 publications

(10 citation statements)

References 20 publications

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“…Therefore, experiments previously carried out at the optimal standoff distance and the results obtained are somewhat questionable. In previous studies [ 19 , 25 ], standoff distance was determined using the incline trajectory, where the vertical component of velocity ( v y = v.sinα mm/s) was neglected. This resulted in the decrement in the actual velocity ( v = v PWJ − v y ) of the PWJ, leading to reduction in the impact force.…”

Section: Methodsmentioning

confidence: 99%

“…The acoustic chamber was found to be the most important parameter as it controls the variable axial jet speeds [ 19 ]. The relationship between the acoustic chamber length and standoff distance was studied on AW 6060 aluminum alloy.…”

Section: Introductionmentioning

confidence: 99%

“…The previous studies [ 8 , 10 , 19 , 25 ] that have been reported in Table 1 used stationary or inclined trajectory movement of the PWJ head to determine the optimal standoff distance corresponding to the maximum depth of disintegration. However, in the present article, a new methodology in the form of staircase trajectory movement has been used to include the vertical component of the traverse speed ( v y = v ·sin α mm/s; α is the angle of inclination of the inclined path), which was omitted in the previous studies.…”

Section: Introductionmentioning

confidence: 99%

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Standoff Distance in Ultrasonic Pulsating Water Jet

et al. 2020

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The water hammer effect is the basis of technologies which is artificially responsible for the decay of continuous jets. A recently developed technique enhances the pressure fluctuations using an acoustic chamber, leading to enhanced erosion effects for various water volume flow rates. The optimum standoff distance for an ultrasonic enhanced water jet is not appropriately estimated using an inclined trajectory. The objective of this study is to comprehend the true nature of the interaction of the standoff distance following the stair trajectory and traverse speed of the nozzle on the erosion depth. Additionally, it also critically compares the new method (staircase trajectory) that obeys the variation in frequency of the impingements for defined volume flow rates with the inclined trajectory. In this study, at constant pressure (p = 70 MPa), the role of impingement distribution with the variation of traverse speed (v = 5–35 mm/s) along the centerline of the footprint was investigated. The maximum erosion depth corresponding to each traverse speed is observed at approximately same standoff distance (65 ± 5 mm) and decreases with the increment in traverse speed (h = 1042 and 47 µm at v = 5 and 35 mm/s, respectively). The results are attributed to the variation in the number of impingements per unit length. The surface and morphology analysis of the cross-section using SEM manifested the presence of erosion characteristics (micro-cracks, cavities, voids, and upheaved surface). By varying the water cluster, different impingement densities can be achieved that are suitable for technological operations such as surface peening, material disintegration, or surface roughening.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Standoff Distance in Ultrasonic Pulsating Water Jet

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“…Due to the many advantages of waterjet technology, for instance; absence of thermal damage caused by temperature, absence of structural change of material, sharp and clean cut, controlled fluid pressure, absence of deformation, and reduction of blood loss, usage of water jet technology applications in healthcare drew attention of researchers. There are many search fields for water jet machining to be developed with many experiments (Nag et al, 2019;Tozan, 2011;Valíček et al, 2015). WJT can be used for resection of tissues, tumors, liver, and kidney, cleaning the traumatic wounds, releasing fat cells and saving nerves and blood vessels, removing dead skin as it is called hydro abrasive in dermatology, cholecystectomy surgery, neurosurgery, ophthalmology, oncology and dental applications.…”

Section: Water Jet Machining In Healthcarementioning

confidence: 99%

Nontraditional Machining Process In Healthcare Applications

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Turan

Himtaş

et al. 2021

Journal of Health Systems and Policies

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Although continuous progress in technical advancement, the conventional machining process has became unsatisfactory in healthcare due to its disadvantages. This inadequacy has led researches to consider using the application of nontraditional machining that can machine extremely hard and brittle materials into complicated shapes in healthcare. Researches have proved that diverse NTM applications of Water Jet Machining (WJM), Ultrasonic Machining

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“…The height of the cavity exhibited no time-pressure dependence over the effective and safe range. It even decreased while increasing the water jet pressure, which meant that the surface compressive residual stress could be decreased as a result of increasing the water jet pressure [34,35]. Furthermore, in the initial contact of the water jet and enamel, the interaction process was idealized as the impact of a water column…”

Section: Plos Onementioning

confidence: 99%

Water jet as a novel technique for enamel drilling ex vivo

et al. 2021

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To investigate the usage of a water jet for enamel drilling ex vivo, 210 individual extracted molars without lesions or fillings were collected. Then, the specimens were drilled by a water jet or a high-speed dental drill. The cavities of 50 teeth were reconstructed digitally by micro-computed tomography (micro-CT) to measure the height and width. The cavities of 10 teeth were longitudinally incised and their surfaces were observed by scanning electronic microscopy (SEM). After the cavities were filled, 50 fillings were vertically incised. The bonding interface between tooth and filling was observed by SEM. 50 teeth with fillings were stained in 0.1% rhodamine B solution, and then the dye penetration between tooth and filling was observed under the stereomicroscope and confocal laser scanning microscopy (CLSM). The bonding strength between enamel and filling of 50 teeth was simulated and predicted with finite element analysis (FEA). At 140–150 MPa and for 2–3 s, cavities were made with a depth of approximately 764 μm in each tooth. SEM showed the cavity surface in the water jet group had a more irregular concave and convex structure than that in the high-speed dental drill group. There was a trend that the microleakage and bonding width was smaller in the water jet group than in the high-speed dental drill group. FEA indicated that the stress on the resin surface was greater than on the enamel surface in the water jet group. Compared with the tooth drilled by a high-speed dental drill, the tooth drilled by a water jet gained better retention of the filling material and suffered less bonding strength on the enamel surface. Water jet drilling is effective for enamel drilling.

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Acoustic chamber length performance analysis in ultrasonic pulsating water jet erosion of ductile material

Cited by 31 publications

References 20 publications

Standoff Distance in Ultrasonic Pulsating Water Jet

Standoff Distance in Ultrasonic Pulsating Water Jet

Nontraditional Machining Process In Healthcare Applications

Water jet as a novel technique for enamel drilling ex vivo

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