Bubble film with vortex
A simple and cheap bubble film experiment system was constructed by us. Although it is simple, it can observe the phenomenon similar to those observed in the wind tunnel system or PIV system. But because of gravity, bubble film become a little more complex. We programed some codes to analyze the data and showed bubble thickness is proportional to the Reynolds number. The low frequency sound can make bubble film rotate. And we also study the wing’s attack angle, from 0 to 75 degree with interval of 15 degree, discovering the 15 degree is the best flying attack angle.