described using the Knudsen flow model that is a very different approach as the regular CFD flow.
Another important reason for the breakdown of regular CFD tools is the very high aspect ratio of the nano scale fluidic devices. Because the lengths of the channels are still quite large (often in the micrometre scale, due to the need of transporting the fluids), usual CFD software tools have significant issues in the meshing process. This leads to an exponential increase in computation times, or even to the impossibility of solving the model.
On the other hand, molecular dynamics (MD) tools, suitable for atomistic approaches, become impractical for channels beyond 10-20 nm in diameter.
We, at memsOP, are working on developing a multi-scale modelling approach that will combine different tools to analyse the NEMS/MEMS devices in a hybrid manner. Using molecular dynamics for the nanometre-scale area of the respective devices and CFD tools for the macro-scale ones will provide a wider, deeper understanding of these special devices, overcoming the limitations of each type of approach per se.
www.memsop.com
<< Figure 3: Analysis of a two-phase fluid flow, with droplet formation. >>
discover
innovationknowledgesolutions 30th September & 1st October 2014 NEC, BIRMINGHAM, UK
6 co-located shows Sensors & Instrumentation
for Test, Measurement & Control 30th Sept & 1st Oct 2014, NEC, Birmingham
theMachine
Building Show
mems fabrication miniaturise
ultra precision inspection & metrology
micro manufacturing nanotechnology
networks knowledge commercialisation
www.micronanomems.com For further information contact Pippa Dugmore on 01622 699199 or email
pdugmore@datateam.co.uk
innovation 47 | commercial micro manufacturing international Vol 7 No.3
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