Process Flow Diagram of the Unsteady State Heat Transfer
Forced Convection
Forced convection
is a heat transfer due to motion. As a
fluid flows over another surface which is at a higher or lower temperature than
the fluid, heat is transferred from hotter body to the cooler body. An everyday example of heat transfer due
to forced convection is the cooling of a hot spoon by blowing cool air over
it. As the air flow over the surface of
the spoon, heat is transferred from the hotter surface of the spoon to the
cooler air.
Natural Convection
Natural
convection occurs when heat is transferred due to the proximity of two bodies
at different temperature. As one body comes
in contact with the other heat is transferred from the warmer body to the
cooler one. For example, heat from
a hot metal rod will naturally be
transfered to the air until both are at the same temperature.
In the case of an
insulated system, there is no heat transfered from the system to the
environment. The heat will build up
within the system, inside the insulated area.
This is the only case in which the system may remain perpetually at
unsteady state.
What is Unsteady State Heat Transfer | Unsteady State
Heat Transfer Experiment | Examples of
Unsteady State Heat Transfer | | Applications in Industry | Definitions | References