uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Micropumps for extreme pressures
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Micro Structural Technology .
2009 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The objective of this thesis was to improve a paraffin actuated micropump design, to be able to pump against extreme pressures (above 100 bar). This was accomplished by initially studying the membrane activation, using video capturing. The micropump has been improved to withstand pressures high enough, to enable use in an high-performance liquid chromatography (HPLC) system. The micropump has been shown to pump against back pressures up to 150 bar, with a positive net-flow. This should be compared with the previously recorded maximum back pressure of 50 bar. The pumping against high back pressures was possible due to an increased understanding of the sealing of the membranes. This resulted in a new design that was manufactured and characterised. Without clamping the pump was measured to manage back pressures of 10 bar, and then starting to leak in a bond at the flow channel. With supporting clamping, the managed back pressures increased ten folded.

When measured on the different valves, pressure above 200 bar has been possible to withhold. Although the valves were below their maximum limit, the pressure was not possible to be further increased due to a limitation in the equipment, i.e. risk of damaging the connections. When examined after pressurised at extreme pressures (above 100 bar) several times, no signs of fatigue or damage of the membrane was seen.

A new behaviour of the valves was discovered. Above certain pressures some designs self sealed, i.e. withholding the pressure after the voltage was turned off. For these valves the pressure had to be released by some other means.

Place, publisher, year, edition, pages
2009. , p. 55
Series
UPTEC Q, ISSN 1401-5773 ; 09016
Keywords [en]
Micropump, Micromechanics, Paraffin, Actuator, High-pressure pumping, Steel membrane
Keywords [sv]
Mikropump, Mikromekanik, Paraffin, Aktuator, Höga tryck, Stålmembran
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
URN: urn:nbn:se:uu:diva-110880OAI: oai:DiVA.org:uu-110880DiVA, id: diva2:278862
Presentation
2009-09-24, Ångström sal 4003, Uppsala, 14:15 (Swedish)
Uppsok
Technology
Supervisors
Examiners
Available from: 2009-12-01 Created: 2009-11-30 Last updated: 2009-12-01Bibliographically approved

Open Access in DiVA

fulltext(5997 kB)1260 downloads
File information
File name FULLTEXT01.pdfFile size 5997 kBChecksum SHA-512
4ce117103b714dc174ba89db45da8a0f46a9eec4c7f18ac6ab170220e3970ea2b3b65a0084059cc68f7b0fe29668406f5971b7d51018a13d2d3d1bc2e8fb95fb
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Svensson, Stefan
By organisation
Micro Structural Technology
Other Engineering and Technologies not elsewhere specified

Search outside of DiVA

GoogleGoogle Scholar
Total: 1260 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 1405 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf