TY - JOUR
T1 - Heat transfer characteristics of reflux condensation phenomena in a single vertical tube
AU - Chou, Gung Huei
AU - Chen, Jyh Chen
PY - 1997/10
Y1 - 1997/10
N2 - An analytical study is conducted of condensation heat transfer characteristics under refluxcooling modes with both constant temperature and constant heat flux (CHF) at the inner wall of a single vertical tube. The effects of interfacial shear stress and convection on the reflux condensation heat transfer are examined analytically. The results indicate that interfacial shear retards the condensate flow and thickens the liquid film layer, which in turn decreases the condensation heat transfer coefficient (HTC). The dimensionless film thickness and local HTC with zero convection varies with an increase in the interfacial shear and has a remarkable effect on the condensation process, especially with a larger condensation length. However, the film Reynolds number has the opposite effect. Additionally, the interfacial shear thickens the film and retards the liquid flow relatively more distinctly for the CHF case. Finally, compared with the experimental data from previous study, the observed trend of the condensation heat transfer can be reasonably described by the present model at moderate film Reynolds numbers.
AB - An analytical study is conducted of condensation heat transfer characteristics under refluxcooling modes with both constant temperature and constant heat flux (CHF) at the inner wall of a single vertical tube. The effects of interfacial shear stress and convection on the reflux condensation heat transfer are examined analytically. The results indicate that interfacial shear retards the condensate flow and thickens the liquid film layer, which in turn decreases the condensation heat transfer coefficient (HTC). The dimensionless film thickness and local HTC with zero convection varies with an increase in the interfacial shear and has a remarkable effect on the condensation process, especially with a larger condensation length. However, the film Reynolds number has the opposite effect. Additionally, the interfacial shear thickens the film and retards the liquid flow relatively more distinctly for the CHF case. Finally, compared with the experimental data from previous study, the observed trend of the condensation heat transfer can be reasonably described by the present model at moderate film Reynolds numbers.
UR - http://www.scopus.com/inward/record.url?scp=0344126551&partnerID=8YFLogxK
U2 - 10.13182/NSE97-A28598
DO - 10.13182/NSE97-A28598
M3 - 期刊論文
AN - SCOPUS:0344126551
SN - 0029-5639
VL - 127
SP - 220
EP - 229
JO - Nuclear Science and Engineering
JF - Nuclear Science and Engineering
IS - 2
ER -