What type of fan produces pressure by imparting tangential acceleration to air through the impeller?

The correct answer is that a centrifugal fan produces pressure by imparting tangential acceleration to air through the impeller. In a centrifugal fan, the impeller plays a crucial role in converting the mechanical energy from the motor into kinetic energy in the air. As the impeller rotates, it accelerates the air outward from the center toward the edges due to the centrifugal force, leading to an increase in air pressure.

Centrifugal fans are designed so that the air enters the impeller axially (from the center) and exits radially (perpendicular to the incoming air flow). This design is particularly effective for applications requiring a high pressure rise and is commonly used in ventilation systems, industrial processes, and other scenarios where reliable airflow against resistance is necessary.

The other types of fans mentioned have different operational principles. For example, axial flow fans move air along the axis of the fan and are suitable for applications where a large volume of air is required but lower pressure increases are acceptable. Mixed flow fans blend the characteristics of both axial and centrifugal fans but do not primarily operate by tangential acceleration like centrifugal fans do. Vortex fans utilize a different mechanism, involving the movement of air to create a vortex, rather than relying heavily on the tangential acceleration produced