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Hydrodynamické interakce mezi bublinami stoupajícími v řadě
Stanovský, Petr ; Vejražka, Jiří ; Růžička, Marek ; Drahoš, Jiří
Knowledge about hydrodynamic interaction between bubbles are essential to uderstanding of bubbly flows behavior. The aim of this work is to check the existence of stable separation distance between bubbles experimentally. Air bubbles were produced in ultra-filtered water using a special device - the bubble generator. Pictures were taken with a digital SLR kamera. Bubbles were illuminated by the back light, using a light diffuser. Pictures were processed in MATLAB using the Image Processing Toolbox. Equivalent bubble radius, nonsphericity of bubbles, horizontal spacing and vertical displacement. was evaluated from processed pictures. Behavior of bubbles was compared with theoretical assumptions and models.
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Numerické modelování impaktního proudění tekutiny na stěnu a experimentální ověření výsledků pomocí teplotní anemomerie
Cvetinović, D. ; Tihon, Jaroslav ; Vejražka, Jiří ; Drahoš, Jiří
The configuration of a submerged, circular, unconfined impinging air jet, which issues from a bell-shaped converging nozzle, is characterized numerically and experimentally. A commercial CFD package is repeatedly employed to simulate three different configurations to validate the different turbulence models, namely k–? Re-Normalized Group (RNG), k–? Shear Stress Transport (SST) and the Reynolds Stress Model (RSM). A hot-wire anemometry technique is applied to investigate extensively the flow field of the impinging jet. The comparison of results suggests that the k–? SST turbulence model is the most reliable for the flow configurations under investigation.
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Tvorba bublin: CFD simulace a experimenty
Havlica, Jaromír ; Bunganič, Radovan ; Růžička, Marek ; Drahoš, Jiří
The motivation of our work is the bubble generation from orifices of a gas distributor in bubble columns. Our interest is in the detail dynamics of bubble formation, namely in investigation of the synchronous and asynchronous modes of bubbling from multiple orifices. We considered the bubble formation both form a needle and an orifice on plate. We approached the problem with both the CFD and experiment.
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