Multi-microchannel heat sink for high
density power systems
Vânia Silvério | [email protected]
Microprocessors have the potential of impacting
industrial competitiveness. This can be manifested
through the increased efficiency of equipment and
processes using microprocessors, and through higher
industrial productiveness and higher product quality.
Integrated Circuit industry is under constant pressure
to produce chips that are more powerful and
durable, while reducing in size, weight, and cost.
According to the International Technology Roadmap
for Semiconductors [ITRS, 2011], along with the
above, dissipated power from micro-electronic
components will continue to rise and remain a great
challenge in thermal management. The use of
compact heat exchangers applied to these systems
is very promising due to material and process
compatibility with the Integrated Circuit industry,
device compactness, enhanced axial temperature
uniformity and low thermal resistance. The small
pumping power required to manage high heat
transfer rates allow microchannel evaporators to
achieve very low thermal resistance with a minimal
volume of fluid.
Forced liquid and liquid–vapor (evaporation) in
microchannel evaporators have received increasing
attention since the work developed by Tuckerman
and Pease (1981) on forced liquid cooling for VLSI
(very-large-scale integrated circuits). Liquid cooling
can be seen as the most viable method for practical
applications, while two-phase flow cooling is seen as
the most promising approach for high heat flux
electronic devices in the future. Flow boiling in
microchannels is of increasing interest mainly due to
its higher heat removal capability and higher heat
transfer coefficients. Boiling inside such small
passages provides a very effective way of fluid
movement, as well as relatively large heat dissipation
capabilities for specialized applications.
The program addresses research and development
of new chip cooling technologies to tackle the
increased dissipated heat and achieve powerful
cooling with less energy, thereby paving the way for
cooling next-generation chips. Specific objectives
include mass and energy transport in microchannel
evaporators.
The
experimental
investigation
encompasses simultaneous measurements of the
external microchannel wall temperature (fast
response thermocouples and thermography), inlet
and outlet temperature and pressure combined with
high speed visualization and laser based techniques
(PIV, LIF), to evaluate the behavior of single-phase
and evaporating fluid flow in microchannels. The
characterization of nucleation regimes and the
development of heat transfer coefficients capable of
predicting the correct heat flux in microchannels are
also addressed.
Mechanical
Engineering
Micro and
Nano
Technology
Materials
Engineering
Electronics
Engineering
Engineering
Physics
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Silvério V, Moreira ALN (2016) “Laser induced fluorescence thermometry to characterize flow boiling instabilities in silicon microchannel heatsinks for microsystems cooling”, 18th Int Symp on Applications of Laser Techniques to Fluid
Mechanics, Lisbon, Portugal
Silvério V, Moreira ALN (2016) “Evaluation of a new designed microchannel heat sink for CPU cooling based on IR – thermography synchronized with high-speed flow visualization”, 18th Int Symp on Applications of Laser Techniques to Fluid
Mechanics, Lisbon, Portugal
Silvério V, Cardoso S, Gaspar J, Freitas PP, Moreira ALN (2015) “Design, fabrication and test of an integrated multi-microchannel heatsink for electronics cooling”, Sensors and Actuators A: Physical 235:14-27
Silvério V (2015) “Microchannel cooling technologies”, PhD Open Days, Instituto Superior Técnico, Lisbon, Portugal
Silvério V (2015) “Microfabrication techniques for microchannel cooling technologies”, ICT 2015 Innovate, Connect, Transform, Lisbon, Portugal
Silvério V (2015) “Design and fabrication for microchannel cooling technologies”, TechDays Aveiro, Aveiro EXPO - Parque de Exposições de Aveiro, Portugal
Silvério V, Moreira ALN (2015) “Flow boiling instabilities of low-latent heat of vaporization liquids in single microchannels”, 1st Thermal and Fluid Engineering Summer Conference, TFESC, New York, USA
Silvério V (2015) “Microchannel cooling technologies for high density power systems”, LARSyS 2015 Annual Meeting, Lisbon, Portugal
Silvério V (2014) “Microchannel cooling technologies: experimental techniques at IN+”, LARSyS 2014 Annual Meeting, Lisbon, Portugal
Silvério V (2014) “Microchannel flows and Micron Resolution Particle Image Velocimetry”, LCTES, Instituto Superior Técnico, Technical University of Lisbon, Portugal
Silvério V (2013) “Flow mechanisms in evaporative microchannel systems: experiments at IN+”, LARSyS 2013 Annual Meeting, Pavilhão do Conhecimento – Ciência Viva, Lisbon, Portugal
Silvério V (2013) “Diabatic Flow boiling in transparent microchannels”, IN+ 2013 Annual Meeting, Casa da Achada, Lisbon, Portugal
Silvério V, Moreira ALN (2013) “Methanol and ethanol evaporating flow mechanisms in square and circular microchannels”, ExHFT-8, 8th World Congress on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics, Lisbon, Portugal
Silvério V, Moreira ALN (2013) “Microchannel Cooling Technologies ”, E3 Forum 2013, Pavilhão do Conhecimento – Ciência Viva, Lisbon, Portugal
Silvério V, Moreira ALN (2012) “Diabatic flow boiling in circular transparent microchannels”, EUROTHERM, 6th European Thermal-sciences Conference, Poitiers, France
Silvério V, Moreira ALN (2012) “Flow boiling instabilities in transparent microchannels”, MEFTE IV, IV National Conference in Fluid Mechanics, Thermodynamics and Energy, Lisbon, Portugal
Silvério V, Moreira ALN (2012) “Micro means More: Microchannel Cooling Technologies”, MIT Energy Night, Pavilhão do Conhecimento – Ciência Viva, Lisbon, Portugal
Silvério V (2010) “How useful is the PIV to study the heat and mass transfer mechanisms in microchannel liquid flows”, EWA Trade Association PIV Steering Group Meeting, Lisbon, Portugal
Silvério V, Moreira ALN, Semião V, Nunes de Carvalho C, Lavareda G, Parreira P, Amaral A (2010) “Heat transfer investigations in micro-channel flows”, 15th Int Symp on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal
Silvério V, Semião V, Moreira ALN (2009) “Heat and momentum transfer in microscale laminar fluid flow”, MEFTE III, III National Conference in Fluid Mechanics, Thermodynamics and Energy, Bragança, Portugal
Silvério V, Moreira ALN (2009) “Transport phenomena in micro-channels - MICRA” Cycle of Seminars IN+, Instituto Superior Técnico, Technical University of Lisbon, Portugal