Metal to the metal wear analysis of Aluminium (Al6061grade) alloy, dis-continuously reinforced with ceramic particles of SiC and Al2O3deliver this paper. The Al matrix with 5 to 25% of vol. Fractions of SiC and Al2O3particulate reinforcements were formed in Hybrid Metal Matrix Composite (HMMC) by stirring casting technology. They are finding applications in automotive, aeronautical and sport goods. For the proper use of these composites, its mechanical properties and wear properties are to be evaluated. The dry sliding behavior of these SiC and Al2O3particulates HMMCs and that of Al alloy at atmosphere was analyzed with a pin on disc type wear testing machine. The result indicates that, the scanning electron micrographs of the worn surfaces of the hybrid composites show the worn surface of the composite alloy is rougher than the unreinforced Al6061alloy.
Background:
In this paper, the design and computational modeling of microfluidic
channel capable of separating platelets and Red Blood Cell (RBC) from the other blood cells are
proposed.
Materials and Methods:
Separation based on their sizes is made possible by utilizing negative dielectrophoretic
(n-DEP) force in fusion with drag force. An array of 38º angled electrode separated
by 70 μm distance is designed within the microchannel and analyzed for non-uniform electric
field distribution.
Results and Conclusion:
The molecule movement within the microchannel under induced electric
field is simulated to demonstrate the separation using the particle trajectories module. A numerical
study is performed for the calculation of Clausius Mossotti (CM) factor, n-DEP force and drag
force.
Background:
Microfluidic technologies are a very challenging area today in the field of
biomolecule analysis. This has become feasible with the today’s advanced technologies by designing
and fabricating the microfluidic channel.
Materials and Methods:
Initially, microfluidic channels are used to separate large molecules,
where the molecular dimension of the fluidic filter is greater than the gap size. In this work, separation
of biomolecules (like RBC, WBC and platelets) that are smaller than the microfluidic filter
gap size is demonstrated.
Results and Conclusion:
Due to the curvilinear nature of the spiral, there exists two vortices called
dean vortices within the channel and this is influenced by dean flow, centrifugal flow and tubular
pinch effect. While flowing a small aliquot of blood in the channel, due to these three effects,
molecules attain equilibrium position at one point. The position of equilibrium will be different for
different sized biomolecules and this varies with different input velocities.
Conclusion:
The obtained computational modeling results show how the equilibrium positions influence
the separation efficiency of biomolecules in passive based microfluidic filter. Compared
with the traditional random nanoporous materials such as gel or polymer monolith, spiral based
microfluidic channels can be made precisely to have a pre-determined loop count and Dean Flow
number (De).
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