{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/88096"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/88096","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Enhancement of nucleate boiling heat transfer by surface modification in a cold plate evaporator","abstract":"Electronics cooling applications have very high local heat fluxes, which allow for significant improvement of heat transfer by different methods. This thesis focuses on improving boiling heat transfer by surface modification with R134a in a microchannel cold plate evaporator. Internal copper and brass surfaces were modified with the deposition of copper oxide nanostructures with the intention of improving nucleate boiling heat transfer. The spike-like nanostructures increase the real internal surface area and thus allow for more efficient bubble nucleation. Heat transfer coefficients were calculated with both baseline and modified cold plates for varied heat and mass flux loadings to compare how effective the nanostructures are at improving heat transfer. Longevity of the coating in a working environment and any loss of effectiveness over time were explored. To better understand the differences caused by this surface modification, flow visualization was also considered.","abstract_html":"Electronics cooling applications have very high local heat fluxes, which allow for significant improvement of heat transfer by different methods. This thesis focuses on improving boiling heat transfer by surface modification with R134a in a microchannel cold plate evaporator. Internal copper and brass surfaces were modified with the deposition of copper oxide nanostructures with the intention of improving nucleate boiling heat transfer. The spike-like nanostructures increase the real internal surface area and thus allow for more efficient bubble nucleation. Heat transfer coefficients were calculated with both baseline and modified cold plates for varied heat and mass flux loadings to compare how effective the nanostructures are at improving heat transfer. Longevity of the coating in a working environment and any loss of effectiveness over time were explored. To better understand the differences caused by this surface modification, flow visualization was also considered.","abstract_has_math":false,"creators":["Alexander, Gregory J."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Hrnjak, Pega"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-29T20:38:46Z","date_published":"2015-09-29T20:38:46Z","updated_at":"2026-07-22T22:26:31Z","subjects":["R134a","surface modification","boiling","heat transfer","copper oxide","refrigerant","phase change","two-phase","structure","nanocoating","nanostructure","nano","roughness"],"languages":["en"],"rights":["Copyright 2015 Gregory John Alexander"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/88096","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Hrnjak, Pega"]},{"key":"dc:creator","label":"Author","values":["Alexander, Gregory J."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-29T20:38:46Z","2015-08","2015-07-22","2015-8"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["R134a","surface modification","boiling","heat transfer","copper oxide","refrigerant","phase change","two-phase","structure","nanocoating","nanostructure","nano","roughness"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2015 Gregory John Alexander"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/88096"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Electronics cooling applications have very high local heat fluxes, which allow for significant improvement of heat transfer by different methods. This thesis focuses on improving boiling heat transfer by surface modification with R134a in a microchannel cold plate evaporator. Internal copper and brass surfaces were modified with the deposition of copper oxide nanostructures with the intention of improving nucleate boiling heat transfer. The spike-like nanostructures increase the real internal surface area and thus allow for more efficient bubble nucleation. Heat transfer coefficients were calculated with both baseline and modified cold plates for varied heat and mass flux loadings to compare how effective the nanostructures are at improving heat transfer. Longevity of the coating in a working environment and any loss of effectiveness over time were explored. To better understand the differences caused by this surface modification, flow visualization was also considered.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2015-09-29 without embargo terms","The student, Gregory Alexander, accepted the attached license on 2015-07-20 at 16:19.","The student, Gregory Alexander, submitted this Thesis for approval on 2015-07-20 at 16:31.","This Thesis was approved for publication on 2015-07-22 at 09:42.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8575 on 2015-09-29 at 13:23:23","Made available in DSpace on 2015-09-29T20:38:46Z (GMT). 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Internal copper and brass surfaces were modified with the deposition of copper oxide nanostructures with the intention of improving nucleate boiling heat transfer. The spike-like nanostructures increase the real internal surface area and thus allow for more efficient bubble nucleation. Heat transfer coefficients were calculated with both baseline and modified cold plates for varied heat and mass flux loadings to compare how effective the nanostructures are at improving heat transfer. Longevity of the coating in a working environment and any loss of effectiveness over time were explored. To better understand the differences caused by this surface modification, flow visualization was also considered.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2015-09-29 without embargo terms","The student, Gregory Alexander, accepted the attached license on 2015-07-20 at 16:19.","The student, Gregory Alexander, submitted this Thesis for approval on 2015-07-20 at 16:31.","This Thesis was approved for publication on 2015-07-22 at 09:42.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8575 on 2015-09-29 at 13:23:23","Made available in DSpace on 2015-09-29T20:38:46Z (GMT). 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