Journal
MICROFLUIDICS AND NANOFLUIDICS
Volume 12, Issue 1-4, Pages 257-264Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10404-011-0869-3
Keywords
Molecular dynamics; Carbon nanotubes; Water flow
Funding
- UK by the Engineering and Physical Sciences Research Council [EP/F002467/1]
- Institution of Mechanical Engineers
- Royal Academy of Engineering
- Leverhulme Trust
- EPSRC [EP/F002467/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F002467/1] Funding Source: researchfish
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Non-equilibrium molecular dynamics simulations are used to investigate water transport through (7,7) CNTs, examining how changing the CNT length affects the internal flow dynamics. Pressure-driven water flow through CNT lengths ranging from 2.5 to 50 nm is simulated. We show that under the same applied pressure difference an increase in CNT length has a negligible effect on the resulting mass flow rate and fluid flow velocity. Flow enhancements over hydrodynamic expectations are directly proportional to the CNT length. Axial profiles of fluid properties demonstrate that entrance and exit effects are significant in the transport of water along CNTs. Large viscous losses in these entrance/exit regions lead into central developed regions in longer CNTs where the flow is effectively frictionless.
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