Challenges of vacuum and aspiration expansion nozzles
Suction 'bell' – standard solution to increase the suction area (vacuum cleaning nozzle, cooker hoods, aspiration systems).
As the flow path increases, the air velocity in the expansion nozzle decreases, resulting in a steady, laminar flow becoming turbulent, causing even greater losses. Switching to a larger suction surface also inevitably distances the collection area (wider end of the expansion nozzle) from the high head area (hose).
Result: loss of performance, especially important for industrial systems and battery-powered devices, resulting in shorter operating times or increased product weight and dimensions.