-The backward incline fan design consists of the single thickness blade and the airfoil blade. The single thickness blade can be used for pneumatic conveying of solids.
-The airfoil type has aerodynamically shaped blades to reduce flow resistance, resulting in a high efficien- cy. Entrained particles will damage the blades, and thus this fan is not suitable for pneumatic conveying. For both types as the flow rate increases, the required power increases, reaches a maximum, and then de- creases instead of continuously increasing. When operating under conditions where the flow rate varies, this characteristic is an asset.
-The forward curved blade fan is designed for low to medium flow rates at low pressures. Because of the cup-shaped blades, solids tend to be held in the fan, and thus this fan is also not suitable for pneumatic conveying of solids.
-Axial fans consist of the tube axial fan and the vane axial fan, which are designed for a wide range of flow rates at low pressures. These fans consist of a propeller enclosed in a duct. They are limited to applications where the gas/air does not contain entrained solids.
-In a tube axial fan, the discharged flow follows a helical path creating turbulence. To reduce turbulence and increase the fan efficiency, the vane axial fan contains flow-straightening vanes.
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