What is NtelliJet®
The NtelliJet® module creates
turbulent, pulsated air-jets that can be directed precisely to
locations where thermal management is needed. From LED heat
dissipation to computer cooling, NtelliJet technology is helping
designers solve cooling challenges requiring high reliability and
flexible form-factor implementations.
The vortex-dominated NtelliJet flow enhances small-scale mixing
near the heated surfaces to yield higher effective heat transfer
at low-volume flow rates compared to conventional air movers. The
NtelliJet flow is created using our patented actuator technology
and proprietary fluidic packaging expertise.
The system wide heat removal takes advantage of the ejector
effect inherent to high-momentum jet flows. As it operates, the
NtelliJet module expels high momentum pulses of air. Each pulse of
air "entrains" or pulls nearby ambient air behind it in its wake.
The diagram below shows the velocity vectors of the NtelliJet flow
as the jet is ejected.
Figure 1a shows the pulse of air emerging from the nozzle. In
Figure 1b the pulse has moved away from the nozzle. Note the large
velocity vectors associated with the vortices accompanying the
NtelliJet formation. In Figure 1c the pulse has moved further
away, and the entrained air can be seen behind it in the form of
the large velocity vectors all pointing in the direction of the
pulse. In Figure 1d the tail of the pulse is seen. Finally in
Figure 1e the pulse has almost fully left the frame, and the air
can be seen recharging the nozzle in preparation for the next
pulse.
The result is highly turbulent, high heat transfer
coefficient air flows located directly where they are needed
inside a product providing system level heat removal.
I. Key benefits:
A. Increased thermal efficiency
Several intrinsic qualities of NtelliJet modules result in much
more thermally efficient air flow than that created with
conventional air movers. The turbulence of the flow results in
more efficient heat transfer from the heat source to the air. The
pulsating nature of a NtelliJet airflow increases mixing between
the boundary layer and mean flow. Finally, the self-induced
entrained flow results in the ability to move the heated air out
of the system.
NtelliJet modules can be tailored to the air flow needs of any
system. Multiple hot spots can be cooled without heatsinks as a
NtelliJet module places the cooling directly where it is needed
without complicated ducting. Heat sinks can be cooled much more
effectively by providing uniform flow across the entire heat sink.
The hub of a fan can often create problems and dead spots within a
chassis, but NtelliJet flow spans the entire heat sink and cool
all channels equally. By the same count, the NtelliJet modules may
be tailored to direct more flow across the center of the heat sink
where the heat source is located. Heat sink flow bypass becomes a
thing of the past as well - the low pressure created by a
NtelliJet module at the heat sink inlet actually causes more air
to be drawn through the flow channels for a given energy input.
All in all, this means it is possible to remove more heat
with less air.
B. Low audible noise
As described earlier, NtelliJet modules produce airflow that is
much more thermally efficient, therefore the amount of air flow
needed to cool the same heat load is reduced. Lower flow rates
translate directly to lower acoustic emissions. In addition, by
not having any bearings, brushes, or other frictional parts, the
NtelliJet module eliminates the acoustic problems associated with
these interfaces.
Acousticians know that there is more to sound than just the SPL
measurement. NtelliJet flow can often be tailored to accommodate
psychoacoustic perceptions as well.
Depending on the application, NtelliJet modules may be
designed for effectively silent operation.
C. High Reliability Cooling
Outpaces Even a
High Reliability Fan
With the elimination of frictional parts common to fans and
blowers, the potential failure modes are greatly reduced, the need
to evaluate forced air vs. natural convection is eliminated, and
the MTBF (Mean-Time-Between-Failures) of even the most reliable
fan is exceeded.
For applications that operate in extreme environments, the
device can be constructed out of robust materials. For
applications previously requiring natural convection due to
failure intolerance factors, the forced air vs. convection
tradeoffs no longer apply.
With NtelliJet modules, the air mover will no longer be the
lowest reliability component in the system, as is the case with
conventional air movers.
D. Low power consumption
Through the development of very efficient actuators, NtelliJet
modules require very low power to operate.
NtelliJet modules can cool the same thermal load as a
conventional fan with a fraction of the power needed.
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