TUBITAK 3501 No: 118M457
As the technology progresses, the electronic
components become smaller and at the same time continue to produce more heat,
and therefore development of new high heat-flux cooling technologies have
become obligatory. The mini and millimeter-scale phase change cooling systems,
which have a reduced size and a large surface area where heat transfer can take
place, have become an integral part of advanced cooling systems. When comparing
phase-change cooling systems with other cooling systems, a relatively low flow
rate of very high evaporation heat, which is associated with the phase change
for most fluids, allows large amounts of heat to dissipate with flow boiling
and substantially solves the many problems. The two-phase cooling technologies
used for critical applications include; heat pipes, loop heat pipes and
capillary pumped loops which are all passive hence very reliable solutions
relying on only capillary effects. Though this passive device cannot meet
future high cooling demands because of the limitations of the capillary pumping
in terms of heat flux, transport distance and multiple heat source
capabilities. On the other hand, in boiling and condensing flows functionality
problems arise since at the micrometer and millimeter-scale, shear/pressure
forces dominate over gravitational forces and cause thermally hydro-dynamically
ineffective/problematic liquid-vapor configurations – such as plug/slugs flow
regimes. For this reason, to overcome the requirement of large amounts of heat
transfer from limited spaces and resolving the above problem, novel
millimeter-scale phase-change devices should be developed. In this study, for
the design of millimeter-scale boilers a 3D Ansys-Fluent© simulation
model was developed and numerical simulations were conducted for two different
cooling fluids (water and FC-72), different mass flow rates and two different
channel heights. Moreover, to examine the simulation results Taguchi method was
used. In order to realize thin film annular flow over the boiler surface,
employed specific boundary conditions in the 3D simulation model were obtained
by means of one dimensional Matlab© simulation code. By means of
utilizing the evaluated numerical results, distribution of heat transfer
coefficient, vapor quality and pressure drop over the heat transfer surfaces
were reported.
TÜBITAK
TUBITAK 3501 No: 118M457
This work was supported by the Scientific and Technological Research council of Turkey (TUBITAK). The study was a part of the TUBITAK 3501 project with the number of 118M457.
Primary Language | English |
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Subjects | Engineering |
Journal Section | Research Articles |
Authors | |
Project Number | TUBITAK 3501 No: 118M457 |
Publication Date | December 31, 2019 |
Acceptance Date | December 25, 2019 |
Published in Issue | Year 2019 Volume: 3 |