scholarly journals Experimental Study on the Coating Removing Characteristics of High-Pressure Water Jet by Micro Jet Flow

Micromachines ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 173
Author(s):  
Dayong Ning ◽  
Qibo Wang ◽  
Jinxin Tian ◽  
Yongjun Gong ◽  
Hongwei Du ◽  
...  
Keyword(s):  
Rigid Wall ◽  
Jet Flow ◽  
Water Jet ◽  
Fluid Field ◽  
Total Exposure Time ◽  
Pressure Water ◽  
Coating Removal ◽  
High Pressure Water Jet ◽  
Design Experiments ◽  
Moving Speed

In this paper, coating removal characteristics of water jet by micro jet flow affected by cleaning parameters is analyzed. Numerical simulation of fluid field calculates the velocity and pressure distribution of a water jet impinging on a rigid wall, which is used for design experiments of coating removal affected by jet pressure, traversal speed, and repeated impacting times. The removal width is used as a measure of water jet coating removal capability. Experiment results show that the coating removal width is constant, independent with traversal speed or repeated times when total exposure time of waterjet impingement is fixed. According to results of coating removal by a linear moving water jet, this study also analyzes characteristics of coating removal by rotating jet disc, especially residual coating affected by rotational and moving speed of the cleaning disc. The research is helpful to improve the coating removal efficiency of cleaning disc devices.

Numerical Simulation on Stress Distribution of High Pressure Water Jet Impacting Solid Material

2012 ◽  
Vol 557-559 ◽  
pp. 2221-2224 ◽  
Author(s):  
Hua Lin Liao
Keyword(s):  
High Pressure ◽  
Stress Distribution ◽  
Maximum Shear Stress ◽  
Solid Material ◽  
Maximum Tensile Stress ◽  
Water Jet ◽  
Fluid Field ◽  
Water Jets ◽  
Pressure Water ◽  
High Pressure Water Jet

It is important to make sure the stress distribution in the media under high pressure water jet as to improve jets utilities. A numerical analyzing model of stress distribution about interaction of high pressure water jets impinging solid material is established according to fluid-structure interaction theory. Standard k-ε equations model and controlled volume method for the water jets, and elastic orthotropic continuum and finite element method for the solid are adopted. The stress distributions in the fluid field and inside solid material with different water jetting velocities were computed using the model and method. Numerical results show that the stress distributes obviously on the part solid material under water jets impingement. The impinging area is subjected to compression stress, and the maximum tensile stress is located on impacting surface and the maximum shear stress being under impacting center about half nozzle diameter away. It concludes that by controlling the jet velocity and distance, jet cutting, breaking, decoating, surface processing efficiencies could be improved.

scholarly journals Influence of Processing Parameters on Coating Removal for High Pressure Water Jet Technology Based on Wall-Climbing Robot

2020 ◽  
Vol 10 (5) ◽  
pp. 1862 ◽  
Author(s):  
Feifei Zhang ◽  
Xuerong Sun ◽  
Zhanpeng Li ◽  
Imran Mohsin ◽  
Yanan Wei ◽  
...  
Keyword(s):  
High Pressure ◽  
Processing Parameters ◽  
Water Jet ◽  
Climbing Robot ◽  
Shipbuilding Industry ◽  
Technical Problems ◽  
Sand Blasting ◽  
Pressure Water ◽  
Coating Removal ◽  
High Pressure Water Jet

The shipbuilding industry is very important for many countries. As an essential process in the shipbuilding industry, surface preparation (or coating removal) is gaining more and more attention. The traditional process used for ship hull coating removal is a sand-blasting process, which is harmful to the environment and inefficient. Recently, high pressure water jet technology has been developed to replace the traditional sand-blasting process. However, there are still many technical problems to be solved. In this paper, one wall-climbing robot was developed to remove coating based on high pressure water jet technology. Coating removal experiments under various experimental conditions were carried out and the corresponding coating removal rate for each case was obtained and compared. In addition, numerical simulation based on Fluid software was conducted to observe the water jet process more visually. Results show that the processing parameters, including the water pressure, travelling speed, inclined angle, and stand-off distance, can greatly influence the coating removal effect. The optimal processing parameters are obtained to guide the application of the high pressure water jet technology based on the designed wall-climbing robot for the shipbuilding industry.

The mechanism and application of high-pressure water jet technology to prevent compound dynamic disaster

2021 ◽  
Vol 14 (13) ◽  
Author(s):  
Zeng-qiang Yang ◽  
Chang Liu ◽  
Feng-shuo Li ◽  
Lin-ming Dou ◽  
Gang-wei Li ◽  
...  
Keyword(s):  
High Pressure ◽  
Water Jet ◽  
Pressure Water ◽  
Dynamic Disaster ◽  
High Pressure Water Jet

Crowning Carrots with a High Pressure Water Jet

1988 ◽  
Vol 4 (4) ◽  
pp. 340-343 ◽  
Author(s):  
John H. Posselius ◽  
Jr.. Glenn T. Conklin
Keyword(s):  
High Pressure ◽  
Water Jet ◽  
Pressure Water ◽  
High Pressure Water Jet

Damage Analysis and Simulation of Rock under High Pressure Waterjet

2011 ◽  
Vol 462-463 ◽  
pp. 774-779
Author(s):  
Hu Si ◽  
Xiao Hong Li ◽  
Yan Ming Xie
Keyword(s):  
High Pressure ◽  
Damage Mechanics ◽  
Water Jet ◽  
Penalty Function Method ◽  
Impulsive Effect ◽  
Contact Method ◽  
Arbitrary Lagrangian Eulerian ◽  
Rock Breakage ◽  
Pressure Water ◽  
High Pressure Water Jet

The high pressure waterjet is widely applied for mine industry, mechanical manufacture, environmental engineering, and medicine field due to its particular characteristic. Recently, the application of high pressure waterjet for gas drainage in mine has been receiving increasing attention with the development of exploitative technology. The micro-damage mechanism of coal under high pressure water jet is key to drain gas effectively. Based on damage mechanics and rock dynamics, the paper analyzed the micro-structure deformation and damage of rock and the impulsive effect under high pressure water jet and developed the dynamic model. Further, on the assumption of that rock was homogeneous and isotropic, a computational model was established based on the Arbitrary Lagrangian Eulerian (ALE) fluid-solid coupling penalty function method. The rock damage under high pressure water jet was simulated by the dynamic contact method. The results showed that the damage and breakage of ruck was mainly attributed to impacting effect and was characterized by local effect, and the evolvement of rock breakage went through three stages and the figure of rock breakage trended a funnel. On the whole, numerical results agreed with experimental results.

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