Peripheral Tunnel Propeller vs Bladed Propeller 3D Animation

Peripheral Tunnels Propeller Embodied as a Computer Fan vs Bladed Propeller

Look at what happens when the gas molecules faces the constant circular section from the Peripheral Tunnels Propeller, when a circular container matches a circular content, the latter isn’t perturbed as the container rotates since the container shape relative to it’s content its the same at any angle.