scholarly journals Effects of Long Standoff Distance and Material Temperature on Water Jet Penetration to Hot Refractory Material.

1998 ◽  
Vol 7 ◽  
pp. 1475-1477
Author(s):  
H. Kiyohashi
Keyword(s):  
Refractory Material ◽  
Water Jet ◽  
Standoff Distance ◽  
Jet Penetration ◽  
Material Temperature

Erosion Experimental Study on Organ-Pipe Nozzles in Air

2012 ◽  
Vol 602-604 ◽  
pp. 1667-1671
Author(s):  
Feng Li ◽  
Duan Feng Han
Keyword(s):  
Experimental Study ◽  
Water Jet ◽  
Standoff Distance ◽  
Water Jets ◽  
Aluminum Block ◽  
Pipe Water ◽  
Nozzle Configuration ◽  
Organ Pipe

Experiment of aluminum block erosion using organ-pipe nozzle was carried out in air. The erosion effects of water jet were used to evaluate the performance of organ-pipe nozzle. The experiment and corresponding data were used to analyze the effects of nozzle configuration, jet pressure, standoff distance. Results have shown that the organ-pipe water jets are much more effective in aluminum block erosion.

scholarly journals Investigation into the Water Jet Erosion Efficiency of Hydrate-Bearing Sediments Based on the Arbitrary Lagrangian-Eulerian Method

2019 ◽  
Vol 9 (1) ◽  
pp. 182 ◽  
Author(s):  
Chen Chen ◽  
Dongbin Pan ◽  
Lin Yang ◽  
Han Zhang ◽  
Bing Li ◽  
...  
Keyword(s):  
Fine Particles ◽  
Numerical Models ◽  
Water Jet ◽  
Nozzle Diameter ◽  
Standoff Distance ◽  
Arbitrary Lagrangian Eulerian ◽  
Threshold Velocity ◽  
Orthogonal Experiments ◽  
Erosion Efficiency ◽  
Jet Velocity

As an innovative way to exploit marine natural gas hydrates (NGH), the solid fluidization exploitation method is to erode hydrate-bearing sediment (HBS) into fine particles by a water jet and transport the particles to an offshore platform. To investigate the water jet erosion efficiency of HBS under various work parameters, such as jet velocity, standoff distance, and nozzle diameter, the Arbitrary Lagrangian–Eulerian (ALE) method was adopted to establish numerical models based on the characteristics of HBS in the South China Sea, and orthogonal experiments were performed to optimize the work parameters. The results show that the water jet erosion efficiency of HBS increases with the increase in jet velocity and nozzle diameter, however it decreases with the increase in standoff distance. The jet velocity is the most significant factor for the erosion efficiency and there exists a threshold velocity which describes the minimum jet velocity required to erode HBS. In addition, comprehensive analysis of the results of the orthogonal experiments indicates that, when the jet velocity is 150 m·s−1, the standoff distance is 0.5 cm, and the nozzle diameter is 2.5 mm, the maximum erosion volume can be obtained, which is 6.0329 cm3. This research provides valuable theoretical support for the solid fluidization exploitation of marine NGH.

scholarly journals Parameter Optimization and Effect Analysis of Low-Pressure Abrasive Water Jet (LPAWJ) for Paint Removal of Remanufacturing Cleaning

2021 ◽  
Vol 13 (5) ◽  
pp. 2900
Author(s):  
Sheng Xiong ◽  
Xiujie Jia ◽  
Shuangshuang Wu ◽  
Fangyi Li ◽  
Mingliang Ma ◽  
...  
Keyword(s):  
Feed Rate ◽  
Water Pressure ◽  
Low Pressure ◽  
Water Jet ◽  
Standoff Distance ◽  
Dominant Factor ◽  
Abrasive Water Jet ◽  
Rate Condition ◽  
Cleaning Performance ◽  
Paint Removal

As an environmentally friendly method, water jet (WJ) technology plays a significant role in the field of remanufacturing cleaning. The cleaning capacity of a WJ is severely restricted by the water pressure, while the impact force will be too large and may damage the cleaned substrate as well as cause energy waste if the pressure is too high. However, by adding abrasives, the cleaning capacity of a low-pressure water jet (LPWJ) will be considerably improved. Although abrasive water jet (AWJ) technology has been used in mechanical machining for decades, very limited research work can be found in the literature for remanufacturing cleaning. In this paper, the role of abrasives in low-pressure abrasive water jet (LPAWJ) cleaning was described. Cleaning performance with different parameters (abrasive feed rate condition, water pressure and standoff distance) in paint removal was experimentally investigated by using the Taguchi design of experiment. The experimental results indicated that the water pressure was the most dominant factor and the optimal parameter combination was the second feed rate condition, 9 MPa water pressure and 300 mm standoff distance. The influence law between the cleaning performance and various factors was explored, which can provide remanufacturers with directions in selection of the optimal parameters in the LPAWJ cleaning process. By designing contrast experiments, the results showed that the cleaning capacity of an LPAWJ is better than that of a pure LPWJ and the residual effect in terms of changes in surface roughness, residual stress and morphology is a little larger.

scholarly journals Influence of Abrasive Water Jet (AWJ) on Surface Roughness

2021 ◽  
Vol 6 (3) ◽  
pp. 132-140
Author(s):  
Ameer Jalil Nader ◽  
K. Shather Saad
Keyword(s):  
Surface Roughness ◽  
Feed Rate ◽  
Water Jet ◽  
Standoff Distance ◽  
Abrasive Water Jet ◽  
Average Surface Roughness ◽  
Machining Processes ◽  
Average Surface ◽  
Water Jet Cutting ◽  
Abrasive Water Jet Cutting

Abrasive water jet (AWJ) is one of the most advanced and valuable non-traditional machining processes because of its massive advantages of removing metals ranging from hard to soft. This paper focused on studying the influence of jet pressure, feed rate and standoff distance on surface roughness during cutting carbon steel using abrasive water jet cutting. A surface roughness device assessed the surface roughness by performing sixteen experiments to identify the distinct texture of the surface. Based on the experiences, the best surface roughness value was 3.14 μm at jet pressure 300 MPa, standoff distance 4mm and feed rate 30 mm/min. The Taguchi method was introduced to implement the experiments and indicate the most influential process parameters on average surface roughness. The experimental results reveal that feed rate has a significant effect on average surface roughness.

Water Veil Effect to Control Splashing from the Pulsed Water Jet Device: Minimizing the Potential Risk of Dissemination Using Surgical Aspirators

2018 ◽  
Vol 79 (04) ◽  
pp. 309-315 ◽  
Author(s):  
Atsushi Nakayashiki ◽  
Atsuhiro Nakagawa ◽  
Motohiko Sato ◽  
Fusako Mochizuki ◽  
Toshiki Endo ◽  
...  
Keyword(s):  
Water Flow ◽  
Potential Risk ◽  
Input Voltage ◽  
Water Jet ◽  
Standoff Distance ◽  
Suction Pressure ◽  
Porcine Brain ◽  
Additional Water ◽  
Pulsed Water Jet ◽  
Brain Phantom

Objective Maximum resection with minimum damage to normal structures is required for a better clinical outcome. Several efficient surgical devices such as the Cavitron ultrasonic surgical aspirator are available. Our group developed the actuator-driven pulsed water jet (ADPJ) to dissect soft tissue with vessel preservation. Although these devices are very effective for resection, tumor seeding is a potential risk. The present study investigated the control of splashing during ADPJ use. We demonstrate the effect of additional water flow around the instrument tip to veil the splashing. Methods Pulsed water jet was ejected from the tip of the ADPJ nozzle. Effects of ADPJ parameters such as input voltage, suction pressure, and distance between the nozzle and the target (standoff distance) on the amount of splashing were analyzed. Methylene blue solution was ejected on photo paper, gelatin brain phantom, and porcine brain harvested and subsequently immersed into physiologic saline to quantify the amount of splashing. Results High-input voltage and a long standoff distance had significant correlations with large amounts of splashing (r > 0.5; p < 0.01). However, suction pressure had no correlation (r = 0.23). Additional water flow combined with the ADPJ decreased the amount of splashing. A high-speed camera recording revealed that the additional water flow formed a water veil that prevented droplet dispersion, as confirmed with experiments using the brain phantom and porcine brain, in which the irregularity and elasticity are specific. Conclusions The veil effect of additional water flow is important to reduce splashing during ADPJ use and can minimize the potential risk of dissemination and enhance the safety of the ADPJ.

Numerical Simulation in Nozzle Outflow of Post-Mixed Water-Jet Peening

2013 ◽  
Vol 448-453 ◽  
pp. 1173-1178 ◽  
Author(s):  
Xing Dong ◽  
Wei Yang ◽  
Hai Lu Zhang
Keyword(s):  
Flow Field ◽  
Water Flow ◽  
Axial Velocity ◽  
Dynamic Pressure ◽  
Water Jet ◽  
Standoff Distance ◽  
Turbulent Characteristics ◽  
Euler Model ◽  
Two Phases ◽  
Mixed Water

In order to achieve movement rule of post-mixed water jet outflow field, post-mixed water jet peening nozzle flow field were simulated by FLUENT software, according to their turbulent characteristics, the mathematical model adopted Euler model, turbulence model adopted the standard kε model. Analyzed the peening pressure and peening standoff distance on the influence of outflow field of liquid-solid two phases-flow axial dynamic pressure and axial velocity, the results show that in different peening pressure, water flow field and pill flow field of axial velocity and the axial dynamic pressure both are symmetrical distribution, and their value increased with the increase of peening pressure to raise, decreases with the increase of peening standoff distance, even, with the increase of length of pill nozzle water flow field of axial velocity decreases, and pill flow field of axial velocity increases. When the peening pressure is 14 MPa, peening standoff distance is 30 mm, length of pill nozzle is 55 mm, maximum axial dynamic pressure of the outflow field is 3.18 MPa, the maximum axial velocity of water flow field and pill flow field respectively are 71.3 m/s and 69.6 m/s.

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