National Repository of Grey Literature 23 records found  previous11 - 20next  jump to record: Search took 0.01 seconds. 
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.
Spontaneous Bubble Production on the Needle
Vejražka, Jiří ; Zedníková, Mária ; Stanovský, Petr
The study of spontaneous bubble production on the needle is necessary to understand all possibilities to control the bubble production on the needle with desired volume and desired production frequency. For this reason the system, where the gas flows into the chamber and continues through the needle, is studied. This system is modeled using modified model of Oguze and Prosperetti (1993). The model results enable to understand how the chamber volume, the diameter and the length of the needle influence the forming process and size of the bubbles. The experimental results are also presented.
Controlled Production of Bubbles
Vejražka, Jiří ; Stanovský, Petr ; Zedníková, Mária
Two apparatuses for the producing of bubbles with desired volume V and production frequency f are designed. In the first one, the bubble formation is controlled by needle movement and in the second one by changing the chamber volume. Production of bubbles in both devices is modeled using simple model enabling to estimate the range of bubble volumes V and frequencies f, for which the devices will work properly.
Některé aspekty modelování plynokapalinových soustav
Bunganič, Radovan ; Růžička, Marek ; Drahoš, Jiří
This article deals with some aspects of modelling gas-liquid systems.

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