| Summary: | 博士 === 國立成功大學 === 機械工程研究所 === 83 === Analysis for thermal interaction of two different heat transfer
systems on both sides of a vertical plate is presented now.
The present investigation includes: (1)The prediction of the
heat transfer rate between two natural convection systems at
different temperatures. (2)The prediction of the heat transfer
rate between laminar film condensation of a saturated vapor and
natural convection. (3)The prediction of the heat transfer
rate between laminar film condensation of a saturated vapor and
forced convection. (4)The prediction of the heat transfer rate
between laminar film condensation of a saturated vapor and
turbulent mixed convection. (5)The prediction of the heat
transfer rate between laminar film condensation in the presence
of a noncondensable gas and natural convection. But, in
previous similar papers, the value of the cold fluid Prandtl
number was assumed to approach infinite, so the effect of
Prandtl number was neglected. The numerical results show that
： (1)The present results calculated by one dimensional heat
conduction model are in good agreements with experimental
results.(2)In some conditions, the effect of the cold fluid
Prandtl number could not be negligible. (3)As Ja<1, Nusselt-
Rohsenow film condensation model is suitable. On the other
hand, when Ja>1 (liquid FC-70R, Ja=3), the numerical solutions
calculated by Nusselt-Rohsenow model are lower than the
experimental results. (4)For Chapter 3 and 4,increasing
Reynolds number Rec can decrease the wall temperature. (5)The
presence of a very small amount of a noncondensable gas in the
bulk of the vapor could cause a large buildup of the
noncondensable gas at the liquid-vapor interface, so the
temperature at the interface would decrease. It is worth
memtioning that the interface temperature is not equal to wall
temperature.
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