Imperial College London
Professor Richard Syms

ProfessorRichardSyms

Faculty of Engineering, Department of Electrical and Electronic Engineering

Professor
 
 
 
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Contact

 

+44 (0)20 7594 6203r.syms

 
 
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Location

 

702Electrical EngineeringSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Wright:2018:1361-6439/aac001,
author = {Wright, S and Syms, RRA},
doi = {1361-6439/aac001},
journal = {Journal of Micromechanics and Microengineering},
title = {Supersonic jet interactions with a micro-engineered skimmer},
url = {http://dx.doi.org/10.1088/1361-6439/aac001},
volume = {28},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - A micro-engineered, skimmer-based vacuum interface has been demonstrated and used to investigate gas dynamics on a sub-millimeter length scale. The interface is fabricated as a stacked assembly of silicon dies, based on an anisotropically etched inlet orifice and a pyramidal skimmer cone formed in electroplated nickel. Expansion of gas into vacuum, interaction of a supersonic jet with the skimmer and transmission of a collimated beam into a second vacuum stage have all been imaged with a schlieren microscope. Using a glass-walled vacuum chamber, flow patterns upstream and fully downstream of the skimmer have been imaged together for the first time. At low first-stage pressures, the 150–200 µm tall skimmers cannot fully penetrate the shock arising from interaction of the jet with the back wall. However, as the pressure is increased, a multiple shock cell structure evolves, the jet narrows and transmission rises sharply. Eventually, a collimated beam is transmitted to the second stage. When the skimmer aperture is smaller than the source aperture, a series of distinct peaks is evident in a plot of transmission against first-stage pressure. Imaging shows that at each successive peak, the number of shock cells increases by one and the skimmer inlet is coincident with a node.
AU  - Wright,S
AU  - Syms,RRA
DO  - 1361-6439/aac001
PY  - 2018///
SN  - 0960-1317
TI  - Supersonic jet interactions with a micro-engineered skimmer
T2  - Journal of Micromechanics and Microengineering
UR  - http://dx.doi.org/10.1088/1361-6439/aac001
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000432351800001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/63194
VL  - 28
ER  -
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