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Effect of vane thickness on radiometric force

Published online by Cambridge University Press:  29 October 2013

Austin Ventura ,
Natalia Gimelshein ,
Sergey Gimelshein  and
Andrew Ketsdever
Austin Ventura
Affiliation:
University of Colorado – Colorado Springs, Colorado Springs, CO 80918, USA
Natalia Gimelshein
Affiliation:
Gimel, Inc., Montrose, CA 91020, USA
Sergey Gimelshein*
Affiliation:
University of Colorado – Colorado Springs, Colorado Springs, CO 80918, USA
Andrew Ketsdever
Affiliation:
University of Colorado – Colorado Springs, Colorado Springs, CO 80918, USA
*
†Email address for correspondence: [email protected]
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Abstract

A numerical and experimental study of radiometric forces on vanes of different thickness is presented for the flow regime where the radiometric force is near its maximum. For single- and multi-vane geometries, it is shown that radiometric force decreases by only ∼10–15 % when the vane thickness-to-height ratio increases fourfold from 0.5 to 2. For a single-vane geometry, the shear force on the lateral side of the vane is attributed to a vortex flow generated by the interaction of cold chamber walls and heated walls of the vane. In that case, it always acts to reduce the total radiometric force governed by the pressure difference between the hot and the cold sides of the vane. For a multi-vane geometry, represented by a perforated vane, the shear force becomes positive for larger thickness-to-height ratios and lower pressures, primarily due to strong vane-driven transpiration flow through the gaps.

JFM classification

Micro-/Nano-fluid dynamics: Micro-/Nano-fluid dynamics Micro-/Nano-fluid dynamics: Non-continuum effects Rarefied Gas Flow: Rarefied Gas Flow
Type
Papers
Information
Journal of Fluid Mechanics , Volume 735 , 25 November 2013 , pp. 684 - 704
Copyright
©2013 Cambridge University Press 

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