In this animation gas bubbles in a fluidised bed are forming at a nozzle and flowing past a solid obstacle similar to a heat exchanger tube. Black vectors show the velocity of the solids in the bed.
If the animation does not load or is of poor quality, try running this compiled Smacker file: f7.exe (0.9MB).
Note that this is an executable file, and should be suitable for all PCs running Win95 or later. For more information about Smacker and its compiled executables, please follow this link.