The simulation
results show that assuming variable properties for the liquid
in this range of temperature has no considerable effect on the final
results. Fig. 4 shows the results corresponding to the variable and
constant water properties where u ¼ 0.187 m/s. As can be observed
from Fig. 4 the differences are not considerable.
Assuming a normalized temperature as Eq. (15) the variations of
the fluid temperature can be captured versus time.