{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/108121"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/108121","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Boiling on hierarchical nanoengineered surfaces","abstract":"Boiling heat transfer can be enhanced by applying nanostructured surfaces. Past studies have investigated well-ordered, non-scalable structures to study the fundamental limitations of boiling. Here, we developed a highly scalable, three-tier hierarchical surface deposition technique to investigate the pool boiling heat transfer performance with focus on the bubble departure diameter and frequency. Ultrahigh critical heat fluxes (CHF) greater than 400 W/cm2 were obtained, corresponding to an enhancement of ≈245% compared to smooth copper surfaces. Our work reveals the existence of a linear relationship between the surface wickability and CHF enhancement. The fabrication method to obtain novel and optimized three-tier hierarchical structures for pool boiling heat transfer applications is developed. The dimension of each level of structures is optimized individually to contribute to the heat transfer enhancement, which allows us to approach the theoretical limit of pool boiling heat flux. Furthermore, our novel development of high-magnification in-liquid endoscopy for the study of bubble behavior on micro/nanostructured surfaces provides a new tool for phase change heat transfer studies.","abstract_html":"Boiling heat transfer can be enhanced by applying nanostructured surfaces. Past studies have investigated well-ordered, non-scalable structures to study the fundamental limitations of boiling. Here, we developed a highly scalable, three-tier hierarchical surface deposition technique to investigate the pool boiling heat transfer performance with focus on the bubble departure diameter and frequency. Ultrahigh critical heat fluxes (CHF) greater than 400 W/cm2 were obtained, corresponding to an enhancement of ≈245% compared to smooth copper surfaces. Our work reveals the existence of a linear relationship between the surface wickability and CHF enhancement. The fabrication method to obtain novel and optimized three-tier hierarchical structures for pool boiling heat transfer applications is developed. The dimension of each level of structures is optimized individually to contribute to the heat transfer enhancement, which allows us to approach the theoretical limit of pool boiling heat flux. Furthermore, our novel development of high-magnification in-liquid endoscopy for the study of bubble behavior on micro/nanostructured surfaces provides a new tool for phase change heat transfer studies.","abstract_has_math":false,"creators":["Fu, Wuchen"],"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":2020,"date_issued":"2020-08-26T23:55:52Z","date_published":"2020-08-26T23:55:52Z","updated_at":"2026-07-22T22:24:47Z","subjects":["Pool boiling","Wickability"],"languages":["en"],"rights":["Copyright 2020 Wuchen Fu"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/108121","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":["Fu, Wuchen"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2020-08-26T23:55:52Z","2022-08-26T23:58:55Z","2020-04-24","2020-05"]},{"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":["Pool boiling","Wickability"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2020 Wuchen Fu"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/108121"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Boiling heat transfer can be enhanced by applying nanostructured surfaces. Past studies have investigated well-ordered, non-scalable structures to study the fundamental limitations of boiling. Here, we developed a highly scalable, three-tier hierarchical surface deposition technique to investigate the pool boiling heat transfer performance with focus on the bubble departure diameter and frequency. Ultrahigh critical heat fluxes (CHF) greater than 400 W/cm2 were obtained, corresponding to an enhancement of ≈245% compared to smooth copper surfaces. Our work reveals the existence of a linear relationship between the surface wickability and CHF enhancement. The fabrication method to obtain novel and optimized three-tier hierarchical structures for pool boiling heat transfer applications is developed. The dimension of each level of structures is optimized individually to contribute to the heat transfer enhancement, which allows us to approach the theoretical limit of pool boiling heat flux. Furthermore, our novel development of high-magnification in-liquid endoscopy for the study of bubble behavior on micro/nanostructured surfaces provides a new tool for phase change heat transfer studies.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2022-05-01","The student, Wuchen Fu, accepted the attached license on 2020-04-22 at 13:23.","The student, Wuchen Fu, submitted this Thesis for approval on 2020-04-22 at 13:41.","This Thesis was approved for publication on 2020-04-24 at 16:48.","DSpace SAF Submission Ingestion Package generated from Vireo submission #15040 on 2020-08-25 at 17:28:02","Made available in DSpace on 2020-08-26T23:55:52Z (GMT). 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Past studies have investigated well-ordered, non-scalable structures to study the fundamental limitations of boiling. Here, we developed a highly scalable, three-tier hierarchical surface deposition technique to investigate the pool boiling heat transfer performance with focus on the bubble departure diameter and frequency. Ultrahigh critical heat fluxes (CHF) greater than 400 W/cm2 were obtained, corresponding to an enhancement of ≈245% compared to smooth copper surfaces. Our work reveals the existence of a linear relationship between the surface wickability and CHF enhancement. The fabrication method to obtain novel and optimized three-tier hierarchical structures for pool boiling heat transfer applications is developed. The dimension of each level of structures is optimized individually to contribute to the heat transfer enhancement, which allows us to approach the theoretical limit of pool boiling heat flux. Furthermore, our novel development of high-magnification in-liquid endoscopy for the study of bubble behavior on micro/nanostructured surfaces provides a new tool for phase change heat transfer studies.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2022-05-01","The student, Wuchen Fu, accepted the attached license on 2020-04-22 at 13:23.","The student, Wuchen Fu, submitted this Thesis for approval on 2020-04-22 at 13:41.","This Thesis was approved for publication on 2020-04-24 at 16:48.","DSpace SAF Submission Ingestion Package generated from Vireo submission #15040 on 2020-08-25 at 17:28:02","Made available in DSpace on 2020-08-26T23:55:52Z (GMT). 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