Projects per year
Abstract / Description of output
We propose the rarefied gas-cushion model (r-GCM), as an extended version of the gas-cushion model (GCM), to estimate the apparent slip of water flowing over a gas layer trapped at a solid surface. Nanobubbles or gas nanofilms may manifest rarefied gas effects, and the r-GCM incorporates kinetic boundary conditions for the gas component in the slip Knudsen regime. These enable an apparent hydrodynamic slip length to be calculated given the gas thickness, the Knudsen number and the bulk fluid viscosities. We assess the r-GCM through non-equilibrium molecular dynamics (NEMD) simulations of shear-driven liquid flow over an infinite gas nanofilm covering a solid surface, from the gas slip regime to the early transition regime, beyond which NEMD is computationally impractical. We find that, over the flow regimes examined, the r-GCM provides better predictions of the apparent liquid slip, and retrieves both the GCM and the free-molecular behaviour in the appropriate limits.
Original language | English |
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Article number | 084003 |
Journal | Physical Review Fluids |
Volume | 2 |
DOIs | |
Publication status | Published - 7 Aug 2017 |
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Dive into the research topics of 'Liquid slip over gas nanofilms'. Together they form a unique fingerprint.Projects
- 3 Finished
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Nano-Engineered Flow Technologies: Simulation for Design across Scale and Phase
Reese, J. & Borg, M.
1/01/16 → 31/12/21
Project: Research
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ARCHER leadership project: "Multiscale simulation of interfacial dynamics for breakthrough nano/micro-flow engineering applications"
Borg, M. & Reese, J.
1/11/15 → 1/11/17
Project: Awarded Facility Time
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The First Open-Source Software for Non-Continuum Flows in Engineering
Reese, J. & Borg, M.
1/10/13 → 31/03/18
Project: Research
Datasets
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Liquid slip over gas nanofilms
Ramisetti, S. (Creator), Borg, M. (Creator), Lockerby, D. A. (Creator) & Reese, J. (Creator), Edinburgh DataShare, 1 Aug 2017
DOI: 10.7488/ds/2071
Dataset