Bulk Temperature Definition
The bulk temperature
T
b
is defined as
where
is a cross-sectional surface of the tube where the flow takes place,
u
is the flow velocity field,
τ
is the tangential direction of the flow, and
T
is the temperature field.
The bulk temperature can be used to evaluate the heat transfer coefficient
h
at tube walls:
where
q
w
is the wall heat flux, and
T
w
is the wall temperature.
is a cross-sectional surface of the tube where the flow takes place, u is the flow velocity field, τ is the tangential direction of the flow, and T is the temperature field.