An analytical investigation has been conducted to understand the internal f
luid flow and heat transfer in the condenser with porous wick of an innovat
ive capillary pumping loop (CPL) system. A mathematical model is proposed a
nd used to describe the:flow and heat transfer, especially interfacial tran
sport phenomena. The liquid-vapor interface of the condensed liquid film wa
s numerically determined. Some factors, such as vapor pressure, wall subcoo
ling, wall heat load and thermofluid properties, have significant influence
on the heat transfer process: and the shape of liquid-vapor interface. Mea
nwhile, an experimental facility was setup and an experimental investigatio
n was completed. Theoretical prediction and experimental results show quite
good consistence.