Periodic pulsation of the shape and velocity of rising bubbles

Proceedings of the 30th International Conference of SSCHE
179
Periodic pulsation of the shape and velocity of rising bubbles
Pavel Raška , Kamil Wichterle, Jana Wichterlová, Petr Čermák
VSB Technical University of Ostrava, 17.listopadu 15, 70833 Ostrava Poruba, CR,
Phone 420-596 994 304, Fax 420-596 918 647, [email protected]
Keywords: bubbles, visualization, velocity, oscillation
Rising bubbles apparently levitating in downstream liquid flow are recorded by digital
camera. New software tools handle systematically the clips. A set of data describing twocoordinate position, shape and size of the bubble are stored for any single frame. The data for
the whole clip are statistically evaluated and periodic properties of the bubble pulsation are
determined for medium size bubbles (diameter 3-10 mm).
Acknowledgment
Support of the Grant Agency of the Czech Republic by the project 104/01/0547is
acknowledged