mixed, and high flow forced convection. There is no clear
definition or consensus on the flow velocity that separates
the mixed and forced flow regimes. It is generally accepted
in applications, however, that the effect of buoyant force
on the overall heat transfer diminishes to a negligible level
(under 5%) when the air flow velocity exceeds beyond 1.5
to 2 m/s.
the heat sink. In any type of heat sink, one of the
most important external parameters in air cooling is the
flow condition which can be classified as natural, low flow