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National Repository of Grey Literature 12 records found  previous11 - 12  jump to record: Search took 0.00 seconds. 
Optické sondy a jejich přesnost měření
 Vejražka, Jiří ; Večeř, Marek ; Orvalho, Sandra ; Sechet, P. ; Cartellier, A.
The optical probes are commonly used for experimental measurements in gas-liquid multiphase systems. During the measurement, it is evaluated the intensity of the light, which reflects from the tip of the optical fiber placed in the measuring point. From the obtained signals, it is possible to evaluate the bubble residence time, local gas hold-up and it is possible to estimate the size and the velocity of the bubbles. In this study, the signal of the optical probe is compared with the data obtained by direct observation by high-speed camera. It was found that optical probe works well in the case of large and fast moving bubbles. In the case of small and slow bubbles the data measured by optical probe are not usable. The dimensionless criterion for minimal Weber number characterizing the reliability of the probe was derived on the base of motion equation for the bubbles.
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Hydrodynamika bubliny narážející na stěnu, experiment a modelování
 Zedníková, Mária ; Vejražka, Jiří ; Růžička, Marek ; Drahoš, Jiří
The contribution deals with both experimental and theoretical investigation of collision of a bubble with a horizontal hydrophobic (glass) surface. The terminal bubble velocity, impact velocity, contact time of bubble with the wall and restitution coefficient (ratio of restitution and terminal velocity) are evaluated (by means of a high-speed camera) as a function of bubble size, which is ranging from 0.4 to 1.1 mm. The experimental results are compared with the models based on a balance of forces acting on a bubble during the interaction process. A good agreement is showed between the experimental data and theoretical predictions.
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