KURENAI : Kyoto University Research Information Repository

In contrast to the design parameters such as di and d
efficient cannot be determined independent of a flow
ties. Thus Eq. (35) imposes an additional constraint
In general the heat transfer coefficient depends
and flow conditions. It is customary to represent a
terms of the Nusselt number defined by
the heat transfer co-
field and fluid proper-
on the flow field.
on the fluid properties
correlation for h in
Nu =kd (36)
where d and k are the hydraulic diameter and fluid conductivity. There are a
number of correlations for Nu for a flow in a relatively long tube, however,
the following three correlations typically represent the three important
groups
This
properties
of a
Then
ity
Laminar Flow
Turbulent
(1