How The Dyson Bladeless Fan Works - Electronics | HowStuffWorks

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Dyson Air Multiplier
The Dyson Air Multiplier may look bladeless, but there are blades hidden in the base of the unit. Dyson

Calling a Dyson Air Multiplier a fan without blades is perhaps a touch misleading. They do have blades; you just can't see them because they're hidden inside the pedestals. A motor rotates nine asymmetrically aligned blades to pull air into the device. According to Dyson, the newest iterations can project more than 77 gallons of air per second for cooling airflow.

The air flow is diverted through the back of the machine. But how does the fan multiply the amount of air coming into the pedestal of the device?

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It boils down to physics. While it's true that the atmosphere is gaseous, gases obey the physical laws of fluid dynamics. As air flows through the slits in the circular tube and out through the front of the fan, air behind the fan is drawn through the tube as well. This is called inducement. The flowing air pushed by the motor induces the air behind the fan to follow.

Air surrounding the edges of the fan will also begin to flow in the direction of the breeze. This process is called entrainment. Through inducement and entrainment, Dyson claims its fans increase the output of airflow by 15 times the amount it takes in through the pedestal's motor.

Yet there's one problem that Dyson didn't quite overcome with its unique fan. Next you'll see why Dyson changed the design of its Air Multiplier when it came time to make a second version.

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