Numerical investigation of curved channel Knudsen pump performance

Bond, D. M., Wheatley, V. and Goldsworthy, M. (2014) Numerical investigation of curved channel Knudsen pump performance. International Journal of Heat and Mass Transfer, 76 1-15. doi:10.1016/j.ijheatmasstransfer.2014.04.021


Author Bond, D. M.
Wheatley, V.
Goldsworthy, M.
Title Numerical investigation of curved channel Knudsen pump performance
Journal name International Journal of Heat and Mass Transfer   Check publisher's open access policy
ISSN 0017-9310
1879-2189
Publication date 2014
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.ijheatmasstransfer.2014.04.021
Open Access Status
Volume 76
Start page 1
End page 15
Total pages 15
Place of publication Doetinchem, The Netherlands
Publisher Elsevier Ltd
Collection year 2015
Language eng
Subject 2210 Mechanical Engineering
3104 Condensed Matter Physics
1507 Transportation and Freight Services
Abstract Thermal creep driven flows in curved micro-channels, commonly referred to as Knudsen pumps, are investigated across a range of rarefaction levels with particular focus on the effects of realistic gas coefficients and geometric configuration on performance. Two base geometries are investigated consisting of a previously proposed curved-straight channel and a newly developed double-curved channel with no straight sections. Use of the S-model kinetic equations enables investigation with realistic values of the Prandtl number and viscosity index for argon and nitrogen as well as for Maxwell molecules. For each gas, the pumping performance and flow structure of each base geometry are investigated for three channel aspect ratios and an array of Knudsen numbers finely spaced between 0.1 and 2.0 to allow performance extrema to be identified. The influence of Prandtl number is found to be significant with increased maximum mass flow rates for argon and nitrogen. The impact of viscosity index is found to be comparatively minor. The double-curved geometry is found to generate over twice the mass flow rate. Both geometries are also tested in pumping array configurations involving multiple sections with the newly introduced geometry again providing superior performance.
Keyword Knudsen pump
Micro-channel
Rarefied gas
Thermal creep
Thermal transpiration
Unified gas kinetic scheme
Validation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2015 Collection
 
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