Modeling of Knudsen layer effects in micro/nanoscale gas flows
Dongari, Nishanth and Zhang, Yonghao and Reese, Jason (2011) Modeling of Knudsen layer effects in micro/nanoscale gas flows. Journal of Fluids Engineering, 133 (7). 071101. ISSN 0098-2202 (https://doi.org/10.1115/1.4004364)
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Abstract
We propose a power-law based effective mean free path (MFP) model so that the Navier-Stokes-Fourier equations can be employed for the transition-regime flows typical of gas micro/nanodevices. The effective MFP model is derived for a system with planar wall confinement by taking into account the boundary limiting effects on the molecular free paths. Our model is validated against molecular dynamics simulation data and compared with other theoretical models. As gas transport properties can be related to the mean free path through kinetic theory, the Navier-Stokes-Fourier constitutive relations are then modified in order to better capture the flow behavior in the Knudsen layers close to surfaces. Our model is applied to fully developed isothermal pressure-driven (Poiseuille) and thermal creep gas flows in microchannels. The results show that our approach greatly improves the near-wall accuracy of the Navier-Stokes-Fourier equations, well beyond the slip-flow regime.
ORCID iDs
Dongari, Nishanth, Zhang, Yonghao ORCID: https://orcid.org/0000-0002-0683-7050 and Reese, Jason ORCID: https://orcid.org/0000-0001-5188-1627;-
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Item type: Article ID code: 32221 Dates: DateEventJuly 2011PublishedSubjects: Technology > Mechanical engineering and machinery
Science > Physics > Solid state physics. NanoscienceDepartment: Faculty of Engineering > Mechanical and Aerospace Engineering
Technology and Innovation Centre > Advanced Engineering and ManufacturingDepositing user: Pure Administrator Date deposited: 21 Jul 2011 09:01 Last modified: 03 Oct 2024 00:20 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/32221