108
HflNRlCf I I:.. 1IEDLEW
and the measured ii and y distribution agrees remarkably well with the
nieasurements of AT as can be seen from Fig. 19.
The mean temperature in the large vortices can be computed on the basis
of the entrainment balance. It is
where. 'vE, is the entrainment flow rate at low velocity side (u = 0. T = 0)
and pf.. is the entrainment flow rate at high velocity side (u = t i o .
T = AT,). From the mean velocity profile we obtain
VE2/PFI = 1.58;
thus
which is in e x d e n t agreement with the measured value of
AT (yrnax) = 0.60.
A TG
o Y = 700
X
65 0
a
600
55 0
A
500
U I
- 0.2
- 0.1
0.1
FIG. 19. Computed tempreture profilc compared with measured distribution.