Experimental and computational observation of radiometric forces on a plate

2007 ◽  
Author(s):  
Nathaniel Selden ◽  
Cedrick Ngalande ◽  
Sergey Gimelshein ◽  
Andrew Ketsdever
Keyword(s):  
Radiometric Forces

Origins of radiometric forces on a circular vane with a temperature gradient

2009 ◽  
Vol 634 ◽  
pp. 419 ◽  
Author(s):  
NATHANIEL SELDEN ◽  
CEDRICK NGALANDE ◽  
NATALIA GIMELSHEIN ◽  
SERGEY GIMELSHEIN ◽  
ANDREW KETSDEVER
Keyword(s):  
Temperature Gradient ◽  
Radiometric Forces

Effect of vane thickness on radiometric force

2013 ◽  
Vol 735 ◽  
pp. 684-704 ◽  
Author(s):  
Austin Ventura ◽  
Natalia Gimelshein ◽  
Sergey Gimelshein ◽  
Andrew Ketsdever
Keyword(s):  
Experimental Study ◽  
Pressure Difference ◽  
Shear Force ◽  
Vortex Flow ◽  
Lateral Side ◽  
Height Ratio ◽  
Flow Through ◽  
Cold Chamber ◽  
Different Thickness ◽  
Radiometric Forces

AbstractA 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.

Impact of vane size and separation on radiometric forces for microactuation

2011 ◽  
Vol 109 (7) ◽  
pp. 074506 ◽  
Author(s):  
Natalia Gimelshein ◽  
Sergey Gimelshein ◽  
Andrew Ketsdever ◽  
Nathaniel Selden
Keyword(s):  
Radiometric Forces

Area and edge effects in radiometric forces

2009 ◽  
Vol 79 (4) ◽  
Author(s):  
N. Selden ◽  
C. Ngalande ◽  
S. Gimelshein ◽  
E. P. Muntz ◽  
A. Alexeenko ◽  
...  
Keyword(s):  
Edge Effects ◽  
Radiometric Forces

Repulsion and attraction caused by radiometric forces

2012 ◽  
Author(s):  
Austin Ventura ◽  
Andrew Ketsdever ◽  
Rebecca Webb ◽  
Alina Alexeenko ◽  
Natalia Gimelshein ◽  
...  
Keyword(s):  
Repulsion And Attraction ◽  
Radiometric Forces
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