Which device uses gas principles to control flow with no moving parts, involving wall attachment and beam deflection?

• A. Fluidic Circuit
• B. Vent Power Sources
• C. PPV
• D. NPV

Answer: (A)

Gas flow control with no moving parts relies on how jets behave in channels. A high-velocity jet can cling to a nearby wall (the Coanda effect) and be steered into one outlet or another. By arranging interactions between jets and walls, the flow is redirected without any mechanical valve or actuator—this is the essence of a fluidic circuit. The “beam” of gas acts to deflect the flow into different paths, switching or amplifying the signal purely through gas dynamics and geometry. That combination—using gas principles to steer flow, with no moving parts, through wall attachment and directional deflection—fits the description exactly. The other options describe ventilation modes or power sources rather than a passive, wall-attachment, jet-deflection device.