1)
Axial-flow fans
An Axial flow pump or
Fan is used to push fluid in a direction that is parallel to the shaft of the
impeller. In comparison, a radial or centrifugal pump or fan would direct the
fluid perpendicular to the axis of rotation. Axial pumps are sometimes termed
propeller pumps owing to their similarity to the propeller of a boat. The
difference, however, is that these pumps are usually shrouded in a casing to
transmit fluids from one specific location to another. 
2)
Centrifugal fan
A centrifugal
fan is a mechanical device for moving air or other gases.
The terms "blower" and "squirrel cage fan" (because it
looks like a hamster wheel) are frequently used as synonyms. These fans
increase the speed of air stream with the rotating impellers. They use the
kinetic energy of the impellers or the rotating blade to increase the
pressure of the air/gas stream which in turn moves them against the resistance
caused by ducts, dampers and other components. Centrifugal fans accelerate air
radially, changing the direction (typically by 90°)
of the airflow. They are sturdy, quiet, reliable, and capable of operating over
a wide range of conditions.
This is some of the research that I will put in the literature review section.
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