Heat Transfer Coefficients — Internal Forced Convection
Isothermal Tube
Figure 4-39:
Schematic representation of geometry and parameters for the averaged heat transfer coefficient correlation applied to forced convection in an isothermal circular tube.
This correlation corresponds to equations 8.55 and 8.61 in
Ref. 20
:
(4-189)
where
Pr
= μ
C
p
⁄
k
, and
Re
D
= ρ
U
ext
D
⁄ μ
.
D
(the tube diameter) and the velocity
U
are correlation inputs. All material data are evaluated at
(
T
+
T
ext
) ⁄
2
except
μ
s
,
which is evaluated at the wall temperature,
T
.
