Investigations on Particle Behavior at the Stagnation Zone for a Suspension Particle Jet in Plasma Spray Conditions

Dolmaire, Alice; Goutier, Simon; Vardelle, Michel; Geffroy, Pierre-Marie; Joulia, Aurélien

doi:10.1007/s11666-021-01174-2

Cited by 10 publications

(3 citation statements)

References 26 publications

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“…This strongly indicates a high-quality mesh, conducive to the stability and accuracy of the simulation. [21]. At this zone, the flow completely stops, thereby converting its kinetic energy into pressure; this is shown in Figure 9b, in which the pressure value reaches the maximum at the center of the bottom discharge gap.…”

Section: Dynamic Mesh Establishing and Parameter Settings For Gap Flo...mentioning

confidence: 94%

“…Ultrasonic vibration causes large fluctuations in the flow layer at the corner position, the liquid always forms a vortex around the corner. The center of the bottom discharge gap where the local velocity of the fluid is almost zero is called the stagnation zone [21]. At this zone, the flow completely stops, thereby converting its kinetic energy into pressure; this is shown in Figure 9b, in which the pressure value reaches the maximum at the center of the bottom discharge gap.…”

Section: Dynamic Mesh Establishing and Parameter Settings For Gap Flo...mentioning

confidence: 99%

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In Situ Observation of Bubbles and the Effect of Ultrasonic Vibration on Bubble Behavior in EDM

Wang,

Sasaki,

Hirao

2023

Materials

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Accumulation and concentration of debris in deep hole electrical discharge machining (EDM) significantly hinder its machining efficiency and accuracy. It is believed that the movement of bubbles associated with the discharge gap flow field play a pivotal role in debris removal and influence the discharge conditions. Ultrasonic vibration (USV) of the electrode is thought to be an effective method for improving EDM-generated bubbles and debris exclusion. In this study, we first elucidated the behavior of bubbles during EDM of holes with varying aspect ratios. Subsequently, USV was introduced to EDM. The behavior of dielectric fluid flow under the influence of ultrasonic vibration was analyzed using computational fluid dynamics (CFD), which revealed time-varying changes in discharge gap flow pressure and velocity. The velocity of the dielectric flow field near the electrode’s side face was found to reach a maximum of approximately 15.2 m/s, greatly facilitating debris removal. High-speed camera observations revealed that bubbles were dispersed within the side gap, with most of them adhering to the electrode’s wall. Furthermore, the bubbles exhibited a tendency to continuously break up and coalesce near the hole’s outlet before escaping in the USV-assisted EDM. These observed characteristics of bubble behavior under the influence of USV are expected to significantly enhance debris removal and promote efficient dielectric exchange.

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Section: Dynamic Mesh Establishing and Parameter Settings For Gap Flo...mentioning

confidence: 94%

Section: Dynamic Mesh Establishing and Parameter Settings For Gap Flo...mentioning

confidence: 99%

In Situ Observation of Bubbles and the Effect of Ultrasonic Vibration on Bubble Behavior in EDM

Wang,

Sasaki,

Hirao

2023

Materials

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“…Zhang et al 17 compared the flow field characteristics of the dynamic impinging stream and steady‐state impinging stream by numerical simulation, and the results showed that turbulence kinetic energy was higher in the dynamic impinging stream, which could enhance the fluid mixing effect. The unsteady impinging stream is of great significance for prolonging the residence time of particles and strengthening the mixing of the flow field 12, 13. Therefore, the mixing mechanism of the dynamic impinging stream and the relationship between flow pattern and mixing characteristics need to be further studied to improve the fluid dynamics theory of the impinging stream.…”

Section: Introductionmentioning

confidence: 99%

Flow Pattern and Mixing Performance of a Dynamic Impinging Stream Reactor

Zhang

Rui

et al. 2023

Chem Eng & Technol

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The mixing process of a dynamic impinging stream reactor was measured by planar laser induced fluorescence. The fluid flow pattern and mixing characteristics were studied under different conditions. The flow field was divided into the following regions by flow pattern: free jet region, impingement region, radial jet region, and radial vortex region. The mixing characteristics were analyzed under different operational conditions. The mixing time first decreased and then increased with increasing nozzle spacing. The mixing time decreased with increasing outlet velocity difference and outlet average velocity, and the optimal working conditions were nozzle spacing L = 4d, where d is nozzle diameter, outlet velocity difference vd = 1 m s−1, and outlet average velocity vp = 1.7 m s−1.

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Designed Modification of Torch for Air-Plasma Spraying

2022

Lecture Notes in Mechanical Engineering

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Investigations on Particle Behavior at the Stagnation Zone for a Suspension Particle Jet in Plasma Spray Conditions

Cited by 10 publications

References 26 publications

In Situ Observation of Bubbles and the Effect of Ultrasonic Vibration on Bubble Behavior in EDM

In Situ Observation of Bubbles and the Effect of Ultrasonic Vibration on Bubble Behavior in EDM

Flow Pattern and Mixing Performance of a Dynamic Impinging Stream Reactor

Designed Modification of Torch for Air-Plasma Spraying

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