Numerical investigation on the internal flow and the particle movement in the abrasive waterjet nozzle

Long, Xinping; Ruan, Xiaofeng; Liu, Qi; Chen, Zhengwen; Shengxiong, Xue; Wu, Ziquan

doi:10.1016/j.powtec.2016.09.089

Cited by 41 publications

(19 citation statements)

References 20 publications

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“…As shown in Figure 10d, with a small water flow rate, the distance traveled was short, because the terminal velocity decreased due to the low fluid momentum. The theoretical results obtained using the developed acceleration model (Equations (18) and (21)) according to the mentioned abrasive properties led to the same conclusions as those obtained from previous theoretical [53], numerical [54], and experimental [55] results obtained by other researchers.…”

Section: Abrasive Particle Acceleration Parameterssupporting

confidence: 82%

Waterjet Erosion Model for Rock-Like Material Considering Properties of Abrasive and Target Materials

Cha

Cho

2019

Applied Sciences

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In this study, we investigated the characteristics of abrasive erosion considering the material properties of abrasives and targets. An abrasive particle erosion model considering energy transfer due to hardness differences was developed based on energy conservation using the correlation between volume removal and effective kinetic energy. To obtain the effective erosion kinetic energy of an abrasive, an acceleration model was derived for the abrasive particles, including terms describing the properties of the abrasive and fluid. The applicability of the suggested model was verified by comparing the brittle erosion results obtained using a previous theoretical approach to those of the present numerical analysis. The results obtained using the developed model exhibited good qualitative agreement with the brittle material erosion results. By evaluating acceleration and the erosion characteristics of an abrasive, the erosion performance could be predicted and optimized.

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Section: Abrasive Particle Acceleration Parameterssupporting

confidence: 82%

Waterjet Erosion Model for Rock-Like Material Considering Properties of Abrasive and Target Materials

Cha

Cho

2019

Applied Sciences

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“…Due to the selfstructure limitation of the cutting head, the standoff distances between the waterjet and the rock surface for cutting heads II and III were greater than that of the linear rock cutting experiments by conical pick with high-pressure waterjet assistance, and waterjet diffusion into the air also decreased the rock stresses by waterjet impact. e waterjet velocity field in the air was determined by using a fluid mechanics numerical simulation method [31,32], when the nozzle diameter and shrinking angle were equal to 0.7 mm and 13°, respectively. e waterjet velocity distribution in the air is shown in Figure 12(a), and it indicated that the waterjet velocity from the nozzle outlet quickly attenuated.…”

Section: Advances In Materials Science and Engineeringmentioning

confidence: 99%

Experimental Research on the Specific Energy Consumption of Rock Breakage Using Different Waterjet‐Assisted Cutting Heads

Jiang

Meng

2018

Advances in Materials Science and Engineering

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To investigate the specific energy consumption (SE) of rock breakage by cutting heads assisted by different types of waterjet and to identify optimal waterjet parameters and assistance types, rock cutting with and without waterjets was carried on a rock fragmentation test bed. SE is a comprehensive evaluation index and was developed according to the applied load on cutting head, and the SE under different cutting conditions was compared and analyzed. e results show that the SE of rock breakage without waterjet assistance increased with the increasing of rock compressive strength (R CS ) but that the limited drilling depth decreased.e effect of the waterjet pressure on the SE of rock breakage by the cutting head I was marked, and SE decreased by 30∼40% when the ratio between R CS and waterjet pressure was less than 1. However, the function of the waterjet assistance was poor; therefore, a ratio of 1 could be used to distinguish the rock breakage effect of cutting head I. For cutting head II, the rock damage from the waterjet impact was limited due to the large waterjet standoff distance; thus the rock breakage performance of cutting head II was also limited. e waterjet impacting at the tip of the conical pick using cutting head III could enter into the cracks caused by the mechanical pick and fracture the rock. erefore, the rock breakage performance of cutting head III was better than that of cutting head II.

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“…Therefore, the AWJ has been widely applied in numerous fields [1][2][3][4]. Recently, the potential of the AWJ technology for high precision cutting or manufacturing of hard-to-machine materials has made the AWJ again receive much attention [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…Momber investigated the energy transfer during the high-speed waterjet formation process and also the abrasive particle mixing and Figure 1. The AWJ cutting system and AWJ nozzle [6].…”

Section: Introductionmentioning

confidence: 99%

“…Long et al conducted numerical simulations to investigate the particle movement inside the AWJ nozzle using different particle shape factors. The results revealed that a smaller particle shape factor could enhance the overall particle acceleration process [6]. Yang et al numerically studied the abrasive particle motions and the corresponding erosion rate inside the AWJ nozzle at the pressures beyond 300 MPa.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of the Liquid-Gas-Solid Three Phase Flow Inside AWJ Nozzle

Long¹,

Liu²

2018

Abrasive Technology - Characteristics and Applications

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The multiphase flows inside the two abrasive waterjet (AWJ) nozzles with different abrasive inlet tube angles are simulated using the standard k-ε turbulence model based on the Euler-Lagrangian approach. The volume of fluid (VOF) method is employed to simulate the water-air multiphase flows. And, the abrasive particles are treated as dilute dispersed phase and tracked with the discrete particle method (DPM). The results indicate that the abrasive inlet tube angle has little impact on the water-phase flows. Further analysis shows that a larger abrasive inlet tube angle can enhance the particle accelerations. The particle number independence analysis is conducted, and the results indicate that sufficient particles should be tracked in order to obtain statistically representative results. The effects of particle initial velocities, particle shape factors, and the restitution coefficients on the predicted particle movements are further analyzed for the two nozzles with abrasive inlet tube angles of 45° and 60°. The results reveal that at the current velocity range, the particle initial velocities have little impact on the predicted particle velocities. However, both the shape factors and the restitution coefficients play an important role on the calculated particle velocities. The results provide a deeper understanding of particle acceleration performance inside the AWJ nozzles with different abrasive inlet tube angles.

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Numerical investigation on the internal flow and the particle movement in the abrasive waterjet nozzle

Cited by 41 publications

References 20 publications

Waterjet Erosion Model for Rock-Like Material Considering Properties of Abrasive and Target Materials

Waterjet Erosion Model for Rock-Like Material Considering Properties of Abrasive and Target Materials

Experimental Research on the Specific Energy Consumption of Rock Breakage Using Different Waterjet‐Assisted Cutting Heads

Numerical Analysis of the Liquid-Gas-Solid Three Phase Flow Inside AWJ Nozzle

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