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Design of device for water jet erosion of materials
Mikulášek, Tomáš ; Kárník, Jan (referee) ; Rudolf, Pavel (advisor)
The aim of this diploma thesis was to design experimental setup for planar samples erosion by means of the water jet on the rotational sample configuration, laboratory experimental testing and its evaluation by means of the 3D optodigital microscope Olympus DSX 510. There were observed typical erosion patterns at the solid tested material surfaces as well as the cavitation erosion. Experiments were carried out at the following water pressures: 0.432 MPa, 1.50 MPa on the rotating sample, at 2.50 MPa on steady sample and on flooded sample for different treatment times. Experimental results of waterjet impact on rotating sample were compared with the theoretical modelling data obtained by CFD modelling. Computational modelling was done in two parts: 3D modelling of water jet flow impact on rigid steady surface and 3D modelling of water jet impact on rigid moving surface. The latter modelling was solved as two phase modelling, where the computational model “Volume of Fluid” was employed. The aim of the study was to find out for the individual cases under study appearance of the water flow and the changes of the magnitude of the force of the impinging water jet on the wall.
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Design of device for water jet erosion of materials
Mikulášek, Tomáš ; Kárník, Jan (referee) ; Rudolf, Pavel (advisor)
The aim of this diploma thesis was to design experimental setup for planar samples erosion by means of the water jet on the rotational sample configuration, laboratory experimental testing and its evaluation by means of the 3D optodigital microscope Olympus DSX 510. There were observed typical erosion patterns at the solid tested material surfaces as well as the cavitation erosion. Experiments were carried out at the following water pressures: 0.432 MPa, 1.50 MPa on the rotating sample, at 2.50 MPa on steady sample and on flooded sample for different treatment times. Experimental results of waterjet impact on rotating sample were compared with the theoretical modelling data obtained by CFD modelling. Computational modelling was done in two parts: 3D modelling of water jet flow impact on rigid steady surface and 3D modelling of water jet impact on rigid moving surface. The latter modelling was solved as two phase modelling, where the computational model “Volume of Fluid” was employed. The aim of the study was to find out for the individual cases under study appearance of the water flow and the changes of the magnitude of the force of the impinging water jet on the wall.
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Effects of pulsating water jet on materials with variously modified surface
Klich, Jiří ; Klichová, Dagmar ; Hlaváček, Petr
The paper deals with determination of erosion effects of pulsating water jet impinging the surface of aluminium alloy samples treated by various techniques (rough and fine milling, planing and rolling). The influence of the initial surface topography on the final topography of the sample exposed to pulsating water jet was investigated. Erosion of surface layer was analysed and discussed with respect to the traversing velocity of the jet. It was found, that properties of the initial surface have a significant impact on the final topography. Degree of erosion of the surface was determined by the measurement of surface parameter Ra.
Fulltext: content.csg -  DOC
Plný tet: UGN_0398577 - DOC
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