
280 Heat Transfer: Thermal Management of Electronics
on either the suction or the discharge end. Therefore, they are good candidates for
situations where large changes in pressure are anticipated.
Examples of dynamic pumps are centrifugal pumps and axial ow pumps. A cen-
trifugal pump is very similar to a centrifugal blower and consists of an impeller with
an intake at its center. As the impeller rotates, liquid is drawn through the intake
and is discharged by the centrifugal force into the casing surrounding the impeller.
The casing is designed such that the uid velocity decreases gradually and its kinetic
energy is converted to the pressure ...