The heat pipe has been regarded as one of the most
efficient heat transfer devices. The two-phase
closed thermosyphon (TPCT) is a gravity assisted
wickless heat pipe, which returns the condensate
from the condenser section to the evaporator
section under the effect of the gravity (Madam,
1983, Zhang, 2003). a two-phase closed
thermosyphon consists of three sections:
evaporator section, adiabatic section and condenser
section, as shown in Fig. 1
Heat transfer coefficient and heat transfer limits
are two criteria that evaluate the heat transfer
performance of TPCT. And the structure of TPCT
is one of factors determining these criteria. Thus,
many scholars ameliorated the heat transfer
performance by the method of modifying the
structure, such as inserting the inner pipe, inner
surface treatment.
Khalid et al. (1999) modified heat pipes with a
separator in the adiabatic section and a three
layered wick in the evaporator section. He et al.
(2009) designed and manufactured an innovative
gravity heat pipe with internal circulating pipe
which is helpful to improve the heat and mass
transfer performance and the working temperature
of the heat pipe. Masoud et al. (2010) modified
surfaces in the evaporator and condenser internal
walls more hydrophilic to enhance the heat transfer
rate. Wang et al. (2009) and Tang et al. (2010)
developed a novel micro grooves fabrication
technique to improve the performance of the heat
The heat pipe has been regarded as one of the mostefficient heat transfer devices. The two-phaseclosed thermosyphon (TPCT) is a gravity assistedwickless heat pipe, which returns the condensatefrom the condenser section to the evaporatorsection under the effect of the gravity (Madam,1983, Zhang, 2003). a two-phase closedthermosyphon consists of three sections:evaporator section, adiabatic section and condensersection, as shown in Fig. 1Heat transfer coefficient and heat transfer limitsare two criteria that evaluate the heat transferperformance of TPCT. And the structure of TPCTis one of factors determining these criteria. Thus,many scholars ameliorated the heat transferperformance by the method of modifying thestructure, such as inserting the inner pipe, innersurface treatment.Khalid et al. (1999) modified heat pipes with aseparator in the adiabatic section and a threelayered wick in the evaporator section. He et al.(2009) designed and manufactured an innovativegravity heat pipe with internal circulating pipewhich is helpful to improve the heat and masstransfer performance and the working temperatureof the heat pipe. Masoud et al. (2010) modifiedsurfaces in the evaporator and condenser internalwalls more hydrophilic to enhance the heat transferrate. Wang et al. (2009) and Tang et al. (2010)developed a novel micro grooves fabricationtechnique to improve the performance of the heat
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