Theoretical Analysis and Simulation of High Pressure Water Jet Cleaning Process

Abstract

Continuous high pressure water jets currently have many industrial applications, for example, mining coal, cutting materials, and cleaning fouling layers. To gain a thorough understanding of the helix nozzle structure, which is optimized by adding an internal spiral line from a cylindrical contracting nozzle, and thereby study jetting characteristics and cleaning effectiveness, a numerical simulation method is presented to capture the features of velocity magnitude and directions and the dynamic pressure in and out of the nozzle. This approach follows the fact that it is more efficient to perform shearing action on the fouling layer in the cleaning process beyond an axial impacting action functioned by a traditional cylindrical contracting nozzle. The results reported in this paper show that the velocity magnitude of the jet issuing from the helix nozzle produces a relatively concentrated distribution, considering the guidance and disturbance by the spiral line, and the dynamic pressure shows similar characteristics. The shearing action of the tangential jetting and the entrainment effect of the shear eddy strengthen cleaning effectiveness.

Finite element simulation of temperature field in laser cleaning of TA15 titanium alloy oxide film

“…近年来制造业的不断发展, 材料 成形前要对待修复及制造的关键部件进行清洗, 清洗 掉表面的污染物, 避免对制造出成形部件的应用产生 不利的影响. 传统的清洗方法包括喷砂喷丸清洗 [6] 、 化学清洗 [7] 、超声波清洗 [8] 、高压水射流清洗 [9] . 这些 人 [10] 数值模拟了准分子激光清洗膜与颗粒的温度场, 并通过实验进行验证激光清洗过程中的机制, 经分析 模拟结果与清洗实验结果一致.…”

Automated technique for high-pressure water-based window cleaning and accompanying parametric study

“…Several studies on high-pressure cleaning have been conducted to enhance the cleaning performance through spray optimization. Zhang reported that the shape characteristics of the nozzle can enhance the performance of high-pressure cleaning [ 19 ]. Peng analytically investigated the effect of the spray distance of the nozzle on the cleaning performance [ 20 ], and Yang studied the effect of the installation of nozzle angle on the spray pressure in the spray system [ 21 ].…”

Towards automated damage detection for in-situ remanufacturing

“…The cleaning process is traditionally carried out manually. However, companies have been working towards the automation of the cleaning process [154], for example, the use of industrial high-pressure waterjet on a robotic arm for cleaning [155], or an oscillatory moving tool mounted on a robot arm [156]. Based on these literatures, before the automated cleaning process itself, it is necessary for the system to acquire data of the damaged part geometry and unclean coverage, and can be in the form of a 3D scan, or photographs.…”