Abstract
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.
Highlights
Remanufacturing cleaning technology is a method of cleaning and removing complex dirt adhering on surface of waste material using devices or chemical solvent
High pressure water flowing through the micro flow channel of the nozzle generates a high fluid-velocity water jet
In the actual jet paint removal and cleaning operation, the water jet rotating cleaning disc is used for large area plate cleaning
Summary
Remanufacturing cleaning technology is a method of cleaning and removing complex dirt adhering on surface of waste material using devices or chemical solvent. In the field of theoretical analysis about jet impingement and coating removal mechanism, Kunaporn et al [13] established a mathematical model to analyze and calculate the pressure distribution on the surface of aluminum alloy impacted by waterjet at different target distances. In order to study the mechanism of jet material removal, Chillman et al [15] established a mathematical model of jet energy density distribution affected by analyzing the relevant parameters such as micro channel diameter of jet, jet pressure, and traversal velocity. This model was verified by experimental results of titanium alloy trench depth after jet impacting titanium alloy. Combined with the application of jet cleaning rotating disc, this study analyzes the removal rate affected by the distribution of jet trajectory, which helps to optimize parameters for improving coating cleanout rate of the rotating cleaning device
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