The aim of the research was to define an appropriate design of the nozzle which could be used to cavitate microbubbles and direct the cavitating water flow on the cleaning metal surface. Three different nozzles were evaluated. SolidWorks 2011 Flow Simulation software was used for calculations. Volume of vacuum bubbles in the flowing part of the nozzle was established. The water pressure at the inlet was varied from 4 to 10 MPa. Calculations show that in all nozzle structures amount of bubbles change slightly while pressure is varied from 4 to 10 MPa, so the optimal pressure of the water flow can be considered as 4 MPa.
The paper presents an environmentally friendly method for cleaning metal surfaces from contaminants. In this method, the contaminants are removed from surfaces by a cavitating pulsating water jet generated in the nozzle and directed at the surface. The cavitation-generating effectiveness of three various design nozzles was investigated numerically using the SolidWorks 2015 Flow Simulation software. The volume fraction of the vapour generated in the flow inside the nozzles was determined. Selected nozzle was studied experimentally in respect of efficiency of abrasive particle removal. After having carried out experiments to test the removal efficiency of the method, it was established that the water that has remained on the cleaned surface decreases its effectiveness. To solve this problem, a prototype of a cavitation-generating head with a water removal system was created and studied numerically.
The article reviews techniques for preparing clean surfaces used in the manufacturing process, considers the types of clean surfaces and their role in modern production and provides the classification methods of arranging such surfaces. The paper also discusses the principles of methods for solvent cleaning, aqueous cleaning, ultrasonic cleaning, precision cleaning and mechanical cleaning. The study focuses on the possibility of adjusting a clean surface using a water flow, including cavitation. Santrauka Apžvelgiami švarių paviršių paruošimo metodai, naudojami gamyboje. Aptariami švarūs paviršiai, jų tipai ir svarba šiuolaikinei gamybai. Pateikiama švarių paviršių paruošimo metodų klasifikacija. Aptariami valymo tirpikliais, valymo vandeniu, ultragarsinio valymo, precizinio valymo, mechaninio valymo ir valymo, naudojant sūkurinį pulsuojantį vandens srautą, metodų principai.
The article reviews techniques for preparing clean surfaces used in the manufacturing process, considers the types of clean surfaces and their role in modern production and provides the classification methods of arranging such surfaces. The paper also discusses the principles of methods for solvent cleaning, aqueous cleaning, ultrasonic cleaning, precision cleaning and mechanical cleaning. The study focuses on the possibility of adjusting a clean surface using a water flow, including cavitation.
Santrauka
Apžvelgiami švarių paviršių paruošimo metodai, naudojami gamyboje. Aptariami švarūs paviršiai, jų tipai ir svarba šiuolaikinei gamybai. Pateikiama švarių paviršių paruošimo metodų klasifikacija. Aptariami valymo tirpikliais, valymo vandeniu, ultragarsinio valymo, precizinio valymo, mechaninio valymo ir valymo, naudojant sūkurinį pulsuojantį vandens srautą, metodų principai.
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