Although the analysis is not limited to
a specific material and coolant fluid, ail the cases presented
in this paper assume aluminum as the material and air for
the coolant. ordinarily, the approach flow velocity, ud, is
a result of the balance between the fan capacity and the
system pressure loss, and is not known a priori, However,
once the model is developed, the approach velocity can be
varied to produce the pressure drop versus flow velocity
relationship for a given system which, in turn, can be used
in conjunction with a particular fan curve to determine the
operating condition of the system,