How
Radiator Works
A radiator is a type of heat exchanger.
It is designed to transfer heat from the hot coolant that flows
through it to the air blown through it by the fan.
Most modern cars use aluminum radiators. These radiators are made
by brazing thin aluminum fins to flattened aluminum tubes. The
coolant flows from the inlet to the outlet through many tubes
mounted in a parallel arrangement. The fins conduct the heat from
the tubes and transfer it to the air flowing through the radiator.
The tubes sometimes have a type of fin
inserted into them called a turbulator, which increases the turbulence
of the fluid flowing through the tubes. If the fluid flowed very
smoothly through the tubes, only the fluid actually touching the
tubes would be cooled directly. The amount of heat transferred
to the tubes from the fluid running through them depends on the
difference in temperature between the tube and the fluid touching
it. So if the fluid that is in contact with the tube cools down
quickly, less heat will be transferred. By creating turbulence
inside the tube, all of the fluid mixes together, keeping the
temperature of the fluid touching the tubes up so that more heat
can be extracted, and all of the fluid inside the tube is used
effectively.
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