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Micro-porous surfaces for enhanced boiling with enhanced mechanical stability

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Micro-porous surfaces for enhanced boiling with enhanced mechanical stability

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dc.contributor.advisor Palm, Björn Einar es_ES
dc.contributor.advisor Muhammed, Mamoun es_ES
dc.contributor.advisor Li, Shanghua es_ES
dc.contributor.author Botella López, Carlos es_ES
dc.date.accessioned 2013-11-14T10:21:36Z
dc.date.available 2013-11-14T10:21:36Z
dc.date.created 2009-09
dc.date.issued 2013-11-14
dc.identifier.uri http://hdl.handle.net/10251/33571
dc.description.abstract Consulta en la Biblioteca ETSI Industriales (8129) es_ES
dc.description.abstract [EN] Enhanced boiling has been object of intense research to tackle problems such as energy wasting or energy conversion systems with low efficiency. Nanotechnology and Nanoscience have been employed by scientists to enhance boiling during last couple of decades. Since boiling is a vigorous process that can erodes enhanced surfaces in heat exchangers or heat pump equipments, new surfaces with high mechanical properties are required. The main objective of this research work is to fabricate nanostructured micro-porous (NMp) surfaces by using electrodeposition technique under certain conditions with dynamic gas bubbles as template, with enhanced mechanical stability through postprocessing. As the porous structure (dendritically ordered copper branches) is formed during the evolution of the dynamic bubbles, it is suited for applications where bubbles are required, like boiling. However, since boiling is a vigorous process, such NMp surface structures require better mechanical stability in order to be used in boiling. In this thesis, different routes such as extra low-current deposition, adding additive, alloying Cu with other metals, etc. have been used to enhance the mechanical stability of the NMp structures. Blowing tests using compressed air under certain parameters directly to the surfaces have been employed to evaluate the mechanical stability of such porous surfaces. As a consequence, new NMp surfaces with enhanced mechanical stability have been obtained, with a %weight remaining after the blowing test more than 90% on some routes. Boiling tests have also been conducted using the widely used chlorofluorocarbon (R134a) as refrigerant, where the heat transfer coefficient (HTC) of such NMp surfaces with enhanced mechanical stability was improved more than 19 times compared to a reference surface at a heat flux of 1 W/cm2. Thus, the mechanical stability of NMp surfaces has been greatly improved without compensating the excellent boiling performance in air conditioning and refrigeration applications. es_ES
dc.language Inglés es_ES
dc.publisher Universitat Politècnica de València es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Consulta en la Biblioteca ETSI Industriales es_ES
dc.subject Energía es_ES
dc.subject Nanotecnología es_ES
dc.subject.classification INGENIERIA QUIMICA es_ES
dc.subject.other Ingeniero Químico-Enginyer Químic es_ES
dc.title Micro-porous surfaces for enhanced boiling with enhanced mechanical stability es_ES
dc.type Proyecto/Trabajo fin de carrera/grado es_ES
dc.rights.accessRights Cerrado es_ES
dc.contributor.affiliation Universitat Politècnica de València. Escuela Técnica Superior de Ingenieros Industriales - Escola Tècnica Superior d'Enginyers Industrials es_ES
dc.description.bibliographicCitation Botella López, C. (2009). Micro-porous surfaces for enhanced boiling with enhanced mechanical stability. http://hdl.handle.net/10251/33571. es_ES
dc.description.accrualMethod Archivo delegado es_ES


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