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Numerical investigation of nanoporous evaporation using direct simulation Monte Carlo
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John, Benzi, Enright, Ryan, Sprittles, James E., Gibelli, Livio, Emerson, David R. and Lockerby, Duncan A. (2019) Numerical investigation of nanoporous evaporation using direct simulation Monte Carlo. Physical Review Fluids, 4 . 113401. doi:10.1103/PhysRevFluids.4.113401 ISSN 2469-990X.
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Official URL: http://dx.doi.org/10.1103/PhysRevFluids.4.113401
Abstract
Evaporation is an effective cooling mechanism widely exploited in the thermal management of modern electronic devices, with a growing interest in the evaporation process in thin film based nanoporous membrane technologies. At such scales, classical approaches fail and one requires solutions of the Boltzmann equation; these are obtained here using the direct simulation Monte Carlo method. In particular, the evaporation from representative nanoporous meniscus shapes, corresponding to different operating conditions, has been investigated. Evaporation rates for the different conditions have been characterized as a function of a wide range of Knudsen numbers and free-stream Mach numbers. Additionally, the influence of porosity and evaporation coefficient on the nanoporous evaporation rates has been assessed. Investigations have also been carried out to consider cases where the meniscus has sunk within the pore, and cooling efficacy compared with cases where the meniscus is pinned to the top of the pore. This work demonstrates that the net evaporative mass flux is ultimately determined by the interplay between various physical effects, whose dominance is quantified by the Knudsen number, porosity, evaporation coefficient and the meniscus shape. This work thus provides useful information for the design of nanoporous membrane-based cooling devices.
| Item Type: | Journal Article | ||||||
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| Subjects: | Q Science > QA Mathematics T Technology > TA Engineering (General). Civil engineering (General) |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Mathematics | ||||||
| Library of Congress Subject Headings (LCSH): | Evaporation -- Mathematical models, Nanopores, Simulated annealing (Mathematics) | ||||||
| Journal or Publication Title: | Physical Review Fluids | ||||||
| Publisher: | American Physical Society | ||||||
| ISSN: | 2469-990X | ||||||
| Official Date: | 4 November 2019 | ||||||
| Dates: |
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| Volume: | 4 | ||||||
| Article Number: | 113401 | ||||||
| DOI: | 10.1103/PhysRevFluids.4.113401 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Reuse Statement (publisher, data, author rights): | © 2019 American Physical Society | ||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||
| Date of first compliant deposit: | 18 October 2019 | ||||||
| Date of first compliant Open Access: | 23 October 2019 | ||||||
| RIOXX Funder/Project Grant: |
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