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dc.contributor.authorBrosten, Tyler R.en_US
dc.date.accessioned2007-05-14T14:40:44Z
dc.date.available2007-05-14T14:40:44Z
dc.date.issued2006en_US
dc.identifier.citationBrosten, T.R. (2006). Model and Test of an Actively Controlled Cryogenic Micro Valve. Master's Thesis, University of Wisconsin-Madison.en_US
dc.identifier.urihttp://digital.library.wisc.edu/1793/7654
dc.descriptionUnder the supervision of Professor Gregory F. Nellis; 159pp.en_US
dc.description.abstractFuture NASA missions require cooling of large optical structures, cryogen storage systems, and instrument chambers and therefore cooling must be applied in a controlled and efficient fashion over a large spatial extent. A cooling system that uses an actively controlled, micro-scale valve may be integrated with heat exchangers and sensors in order to allow the individual branches of a distributed cooling system to be independently controlled in response to local temperature changes. The ability to control the flow area associated with the valve increases the efficiency and flexibility of the distributed cooling system by allowing the cooling to be concentrated according to need. Previous work has selected a suitable micro valve design that addresses the required specifications. However, the precise nature of the flow behavior inside the micro valve was not addressed. Therefore, this thesis focuses on the modeling and test of the pressure-flow behavior of a micro-scale valve over a range of operating conditions. Variable voltage actuation of the PZT actuator within the micro-valve modulates the flow area and therefore the pressure distribution and fluid flow behavior. Fluid-structure models were developed to predict the pressure distribution and flow rates. Experimental data from prototype micro valves was used to validate the analytical predictions.en_US
dc.format.extent1729059 bytes
dc.format.mimetypeapplication/pdf
dc.format.mimetypeapplication/pdfen_US
dc.publisherUniversity of Wisconsin-Madisonen_US
dc.subjectThesis (M.S.)--University of Wisconsin--Madison, 2006.en_US
dc.subjectDissertations Academic Mechanical Engineering.en_US
dc.subjectUniversity of Wisconsin--Madison. College of Engineering.en_US
dc.titleModel and Test of an Actively Controlled Cryogenic Micro Valveen_US


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