John, Benzi, Lockerby, Duncan A., Patronis, Alexander and Emerson, David R. (2018) Simulation of the head-disk interface gap using a hybrid multi-scale method. Microfluidics and Nanofluidics, 22 (9). 106. doi:10.1007/s10404-018-2126-5 ISSN 1613-4982.

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Abstract

We present a hybrid multi-scale method that provides a capability to capture the disparate scales associated with modelling flow in micro- and nano-devices. Our model extends the applicability of an internal-flow multi-scale method by providing a framework to couple the internal (small scale) flow regions to the external (large scale) flow regions. We demonstrate the application of both the original methodology and the new hybrid approach to model the flow field in the vicinity of the head-disk interface gap of a hard disk drive enclosure. The internal flow regions within the gap are modelled by an extended internal-flow multi-scale method that utilises a finite-difference scheme for non-uniform grids. Our proposed hybrid multi-scale method is then employed to couple the internal micro-flow region to the flow external to the gap, to capture entrance/exit effects. We also demonstrate the successful application of the method in capturing other localised phenomena (e.g. those due to localised wall heating).

Item Type:	Journal Article
Subjects:	T Technology > TJ Mechanical engineering and machinery
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH):	Multiscale modeling, Monte Carlo method, Hard disks (Computer science), Gas flow, Free molecular flow
Journal or Publication Title:	Microfluidics and Nanofluidics
Publisher:	Springer
ISSN:	1613-4982
Official Date:	10 September 2018
Dates:	Date Event 10 September 2018 Available 5 September 2018 Accepted
Volume:	22
Number:	9
Article Number:	106
DOI:	10.1007/s10404-018-2126-5
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	13 September 2018
Date of first compliant Open Access:	13 September 2018
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID EP/K038427/1 [EPSRC] Engineering and Physical Sciences Research Council http://dx.doi.org/10.13039/501100000266 EP/K038664/1 [EPSRC] Engineering and Physical Sciences Research Council http://dx.doi.org/10.13039/501100000266 EP/N016602/1 [EPSRC] Engineering and Physical Sciences Research Council http://dx.doi.org/10.13039/501100000266

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