{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/114029"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/114029","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Direct cooling of a planar magnetic converter using dielectric liquid forced convection enabled by additive manufacturing","abstract":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-12-01","abstract_html":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-12-01","abstract_has_math":false,"creators":["Kohler Mendizabal, Johannes"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Miljkovic, Nenad"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-04-29T21:47:48Z","date_published":"2022-04-29T21:47:48Z","updated_at":"2026-07-22T22:24:54Z","subjects":["Mechanical science"],"languages":["en","eng"],"rights":["Copyright 2021 Johannes Kohler Mendizabal"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/114029","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Miljkovic, Nenad"]},{"key":"dc:creator","label":"Author","values":["Kohler Mendizabal, Johannes"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2022-04-29T21:47:48Z","2024-04-29T21:47:53Z","2021-12","2021-12-10"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"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":["Mechanical science"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2021 Johannes Kohler Mendizabal"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/114029"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-12-01","The student, Johannes Kohler Mendizabal, accepted the attached license on 2021-12-09 at 16:40.","The student, Johannes Kohler Mendizabal, submitted this Thesis for approval on 2021-12-09 at 16:48.","This Thesis was approved for publication on 2021-12-10 at 09:23.","DSpace SAF Submission Ingestion Package generated from Vireo submission #17441 on 2022-04-06 at 17:18:06","Made available in DSpace on 2022-04-29T21:47:48Z (GMT). No. of bitstreams: 3 KOHLERMENDIZABAL-THESIS-2021.pdf: 1808534 bytes, checksum: b9f17c43add6228500f3be9070480dc5 (MD5) MASTERS THESIS 2021 - JOHANNES KOHLER MENDIZABAL (2).docx: 9945303 bytes, checksum: fc9ea9fc787a35030f3ee32dd40d34c3 (MD5) LICENSE.txt: 4223 bytes, checksum: 2c402153dca5181c3d8a9e47f107090f (MD5) Previous issue date: 2021-12-10","Embargo set by: Seth Robbins for item 123394 Lift date: 2024-04-29T21:47:53Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only","Power densification of magnetic converters has encountered a fundamental challenge due to the inability to effectively remove heat produced by power losses. State-of-the-art thermal management technologies for planar printed circuit board (PCB) transformers are limited by the inability to substantially improve the overall thermal conductance from the transformer to the cold plate. Furthermore, a lack of thermal management technologies capable of reducing temperature gradients in these devices exists. Direct liquid cooling reduces the number of thermal resistances from hot spot to coolant, resulting in lower maximum temperatures and reduced thermal gradients. Here, we study the thermal-hydraulic performance of a PCB planar transformer cooled using a polymer additively manufactured (AM) housing and single-phase internal flow with Novec 7300 and pore ethylene glycol. Computational fluid dynamics simulations were used to identify hot spots, quantify temperature gradients, and characterize pressure drop. Experiments in a custom-made setup quantified the maximum temperature and pressure drop with different flow rates (0.4 to 4 LPM) of Novec 7300 and ethylene glycol. Both working fluids showed better thermal-hydraulic performance when compared to results found in literature which implements cold-plates. Analysis reveals that selection between both fluids is guided by flow rate, pressure drop and pumping power, such that if low pressure drop is a priority, Novec 7300 is a better choice, and if low pumping power and flow rate are a priority, ethylene glycol is better. Our results show that direct liquid cooling can reduce thermal resistance by up to 80% using an 80% lower pressure drop when compared to a cold-plate benchmark. As a result, the developed AM-enabled thermal management technology can potentially improve the reliability of the converter, provide an alternative for high temperature heat recovery, and facilitate further converter power densification."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Direct cooling of a planar magnetic converter using dielectric liquid forced convection enabled by additive manufacturing"]}]}],"canonical_facts":{"dc:contributor":["Miljkovic, Nenad"],"dc:creator":["Kohler Mendizabal, Johannes"],"dc:date":["2022-04-29T21:47:48Z","2024-04-29T21:47:53Z","2021-12","2021-12-10"],"dc:description":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-12-01","The student, Johannes Kohler Mendizabal, accepted the attached license on 2021-12-09 at 16:40.","The student, Johannes Kohler Mendizabal, submitted this Thesis for approval on 2021-12-09 at 16:48.","This Thesis was approved for publication on 2021-12-10 at 09:23.","DSpace SAF Submission Ingestion Package generated from Vireo submission #17441 on 2022-04-06 at 17:18:06","Made available in DSpace on 2022-04-29T21:47:48Z (GMT). No. of bitstreams: 3 KOHLERMENDIZABAL-THESIS-2021.pdf: 1808534 bytes, checksum: b9f17c43add6228500f3be9070480dc5 (MD5) MASTERS THESIS 2021 - JOHANNES KOHLER MENDIZABAL (2).docx: 9945303 bytes, checksum: fc9ea9fc787a35030f3ee32dd40d34c3 (MD5) LICENSE.txt: 4223 bytes, checksum: 2c402153dca5181c3d8a9e47f107090f (MD5) Previous issue date: 2021-12-10","Embargo set by: Seth Robbins for item 123394 Lift date: 2024-04-29T21:47:53Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only","Power densification of magnetic converters has encountered a fundamental challenge due to the inability to effectively remove heat produced by power losses. State-of-the-art thermal management technologies for planar printed circuit board (PCB) transformers are limited by the inability to substantially improve the overall thermal conductance from the transformer to the cold plate. Furthermore, a lack of thermal management technologies capable of reducing temperature gradients in these devices exists. Direct liquid cooling reduces the number of thermal resistances from hot spot to coolant, resulting in lower maximum temperatures and reduced thermal gradients. Here, we study the thermal-hydraulic performance of a PCB planar transformer cooled using a polymer additively manufactured (AM) housing and single-phase internal flow with Novec 7300 and pore ethylene glycol. Computational fluid dynamics simulations were used to identify hot spots, quantify temperature gradients, and characterize pressure drop. Experiments in a custom-made setup quantified the maximum temperature and pressure drop with different flow rates (0.4 to 4 LPM) of Novec 7300 and ethylene glycol. Both working fluids showed better thermal-hydraulic performance when compared to results found in literature which implements cold-plates. Analysis reveals that selection between both fluids is guided by flow rate, pressure drop and pumping power, such that if low pressure drop is a priority, Novec 7300 is a better choice, and if low pumping power and flow rate are a priority, ethylene glycol is better. Our results show that direct liquid cooling can reduce thermal resistance by up to 80% using an 80% lower pressure drop when compared to a cold-plate benchmark. As a result, the developed AM-enabled thermal management technology can potentially improve the reliability of the converter, provide an alternative for high temperature heat recovery, and facilitate further converter power densification."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/114029"],"dc:language":["en","eng"],"dc:rights":["Copyright 2021 Johannes Kohler Mendizabal"],"dc:subject":["Mechanical science"],"dc:title":["Direct cooling of a planar magnetic converter using dielectric liquid forced convection enabled by additive manufacturing"],"dc:type":["text","Thesis"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:54Z"}