Fans or blowers that create a swirling helical flow pattern are known as what type of flow?

The correct answer refers to fans or blowers that create a swirling helical flow pattern, which is characteristic of axial flow designs. In axial flow systems, air or fluid moves parallel to the axis of the fan or blower. This means that the fluid enters the fan in a straight line and is expelled in a similar direction, creating a helical pattern due to the design of the blades.

The design of axial flow fans allows for efficient movement of large volumes of air or fluid with relatively low resistance, making them ideal for applications such as ventilation or cooling where a constant and straight flow of air is required. Understanding this flow pattern is crucial in selecting the right type of fan or blower for specific applications, as it affects both the efficiency and effectiveness of the system in moving air or other fluids.

Centrifugal flow, on the other hand, involves movement outward from the center of rotation and does not typically create a helical pattern, as it directs flow radially. Helical flow, although it may seem like an accurate description, does not represent the specific category recognized in engineering terminology as axial flow. Propeller flow is also a specific type of axial flow but is distinct in application and design.