A separation bubble in a fluidic device does which of the following?
a. Causes a flip-flop to occur
b. Causes a high-pressure vortex
c. Bends the gas jet stream toward the wall
d. Pushes the gas jet stream away from the wall
ANS: C
A separation bubble is a low-pressure vortex that develops between a wall and a jet stream of gas. The bubble attracts or bends the jet stream toward the wall. The pocket of turbulence forms an air foil, similar to that seen with an airplane wing. When the gas entrained into the bubble from the jet stream equals the amount of air moving from the vortex flow of the bubble back to the jet stream, the attachment is stable.
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