Abstract—A kind of Two-phase Closed Loop Thermosyphon
(TCLT) which dissipate heat of electronic device was
fabricated. The TCLT was composed of an evaporator, a
condenser, a subcooler and connecting tubes. The most
important part, the Enhanced Boiling Microstructures (EBMS)
of evaporator, of the TCLT was studied. Three kinds of EBMS
for nucleate boiling heat transfer were design. Pool boiling
experiments were performed to estimate the performance of all
kinds of microstructures. Then the best EBMS, which have the
lowest wall superheat and highest Critical Heat Flux (CHF),
was chosen as the part of a TCLT. Series dissipating heat
experiments of the TCLT were carried on. Results show that
thermal resistance of TCLT can reach minimum value
0.077