National Repository of Grey Literature 5 records found  Search took 0.00 seconds. 
Ornamental stones surface finishing by pulsating jet: a project for an industrial application
Bortolussi, A. ; Matzuzzi, C. ; Foldyna, Josef ; Sitek, Libor
The paper deals with a project developed to lead the application of pulsating jet technology for ornamental stone surface finishing from a research phase to an industrial level. The project is based on the financial support of the Regional Government of Sardinia – Italy and on the contributes of some Sardinian companies interested in the industrial developments.
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Plný tet: UGN_0398571 - Download fulltextDOC
Use of new knowledge when removing concrete structures by high-speed water jets
Sitek, Libor ; Bodnárová, L. ; Foldyna, Josef ; Klich, Jiří
The article deals with the application of new knowledge and trends in the generation of high-speed water jets and their utilisation during repair of concrete structures not only in laboratory conditions but also for practical use in-situ. Contribution examines several types of water jets with emphasis on reduction of economical intensity of the process of repair and treatment of rehabilitated surface for subsequent application of repair materials.
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Plný tet: Sitek_Sanace2012 - Download fulltextPDF
Preparation of concrete substrate for repair by continuous and pulsating oscillating water jets
Sitek, Libor ; Foldyna, Josef ; Wolf, I. ; Klich, Jiří ; Mazáčová, R.
The water jet ability to remove selectively degraded material can be further improved by introducing high-frequency pressure pulsation into the jet. A series of experiments was realized to compare the effects of both pulsating oscillating and continuous oscillating water jets on the concrete panel. Achieved results are presented in the paper.
Removal of surface layers of corroded concretes by high speed water jets
Sitek, Libor ; Bodnárová, L. ; Foldyna, Josef ; Nováková, Daria ; Ščučka, Jiří ; Martinec, Petr ; Hela, R. ; Mádr, V. ; Hlaváč, L.
Examples of removal of surface layers of concrete specimen (exposed to action of various aggressive medium) by high speed water fan jets are presented in this paper. Experimental laboratory research was focused on utilization of pulsating water jets and their comparison to commonly used continuous water jets.
Calculation of natural frequency of high-pressure system
Foldyna, Josef ; Říha, Zdeněk ; Sitek, Libor
The paper presents results of numerical simulation of 3D, unsteady, turbulent flow of compressible water in a high-pressure system equipped with acoustic generator of pressure pulsations and its response to a pressure impulse. Results of numerical simulation are compared to the laboratory measurement of response of high-pressure system to a pressure impulse using dynamic pressure sensor placed upstream to the nozzle exit.

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