Special Issue "Gas Flows in Microsystems, Volume II"

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "A:Physics".

Deadline for manuscript submissions: 31 May 2020.

Special Issue Editors

Prof. Stéphane Colin
E-Mail Website
Guest Editor
Université de Toulouse, Institut Clément Ader, 3 rue Caroline Aigle, 31400 Toulouse, France
Tel. +33 (0) 5 61 17 10 95
Interests: microfluidics; gas microflows; fluidic microsystems; microscale heat transfer
Special Issues and Collections in MDPI journals
Dr. Lucien Baldas
E-Mail Website
Guest Editor
Université de Toulouse, Institut Clément Ader, 3 rue Caroline Aigle, 31400 Toulouse, France
Tel. +33 (0) 5 61 17 11 01
Interests: microfluidics; gas microflows; fluidic microsystems; particle-laden microflows
Special Issues and Collections in MDPI journals

Special Issue Information

Dear Colleagues,

The last two decades have witnessed a rapid development of micro-electromechanical systems (MEMS) involving gas microflows in various technical fields. Gas microflows can, for example, be observed in micro-heat exchangers designed for chemical applications or for cooling of electronic components, in fluidic micro-actuators developed for active flow control purposes, in micronozzles used for the micro-propulsion of nano- and picosats, in micro-gas chromatographs, analyzers or separators, in vacuum generators and in Knudsen micropumps, as well as in some organs-on-a-chip, such as artificial lungs. These flows are rarefied due to the small MEMS dimensions, and rarefaction can be increased by low pressure conditions. The flows relate to the slip flow, transition or free molecular regimes and can involve monatomic or polyatomic gases and gas mixtures. Hydrodynamics and heat and mass transfer are strongly impacted by rarefaction effects, and temperature-driven microflows offer new opportunities for designing original MEMS for gas pumping or separation. Accordingly, this Special Issue seeks to showcase research papers, short communications, and review articles that focus on novel theoretical and numerical models or data as well as on new experimental results and techniques for improving knowledge on heat and mass transfer in gas microflows. Papers dealing with the development of original gas MEMS are also welcome.

We look forward to receiving your submission.

Prof. Stéphane Colin
Dr. Lucien Baldas
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Micromachines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • gas microflows
  • rarefied flows
  • microscale heat and mass transfer in gases
  • gas MEMS
  • theoretical, experimental and numerical analysis

Published Papers (1 paper)

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Research

Open AccessArticle
Thermally Developing Flow and Heat Transfer in Elliptical Minichannels with Constant Wall Temperature
Micromachines 2019, 10(10), 713; https://doi.org/10.3390/mi10100713 - 21 Oct 2019
Abstract
Laminar convective heat transfer of elliptical minichannels is investigated for hydrodynamically fully developed but thermal developing flow with no-slip condition. A three-dimensional numerical model is developed in different elliptical geometries with the aspect ratio varying from 0.2 to 1. The effect of Reynolds [...] Read more.
Laminar convective heat transfer of elliptical minichannels is investigated for hydrodynamically fully developed but thermal developing flow with no-slip condition. A three-dimensional numerical model is developed in different elliptical geometries with the aspect ratio varying from 0.2 to 1. The effect of Reynolds number (25 ≤ Re ≤ 2000) on the local Nusselt number is examined in detail. The results indicate that the local Nusselt number is a decreasing function of Reynolds number and it is sensitive to Reynolds number especially for Re less than 250. The effect of aspect ratio on local Nusselt number is small when compared with the effect of Reynolds number on local Nusselt number. The local Nusselt number is independent of cross-section geometry at the inlet. The maximum effect of aspect ratio on local Nusselt number arises at the transition section rather than the fully developed region. However, the non-dimensional thermal entrance length is a monotonic decreasing concave function of aspect ratio but a weak function of Reynolds number. Correlations for the local Nusselt number and the thermal developing length for elliptical channels are developed with good accuracy, which may provide guidance for design and optimization of elliptical minichannel heat sinks. Full article
(This article belongs to the Special Issue Gas Flows in Microsystems, Volume II)
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