{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/115761"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/115761","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Surface micro/nano structuring and functionalization for phase change heat transfer enhancement","abstract":"Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01","abstract_html":"Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01","abstract_has_math":false,"creators":["Fazle Rabbi, Kazi"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Miljkovic, Nenad","Ferreira, Placid Matthew","Alleyne, Marianne","Wang, Sophie"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-05","date_published":"2022-05","updated_at":"2026-07-22T22:24:55Z","subjects":["wettability","condensation","frosting","refrigerant","dropwise condensation","nanostructure","microstructure","low surface tension liquid","heat transfer","jumping droplet","superhydrophobic","omniphobic","liquid repellant","refrigeration","metal additive manufacturing"],"languages":["en","eng"],"rights":["© 2022 Kazi Fazle Rabbi"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/115761","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Miljkovic, Nenad","Ferreira, Placid Matthew","Alleyne, Marianne","Wang, Sophie"]},{"key":"dc:creator","label":"Author","values":["Fazle Rabbi, Kazi"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2022-05","2022-04-18"]},{"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":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"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":["wettability","condensation","frosting","refrigerant","dropwise condensation","nanostructure","microstructure","low surface tension liquid","heat transfer","jumping droplet","superhydrophobic","omniphobic","liquid repellant","refrigeration","metal additive manufacturing"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["© 2022 Kazi Fazle Rabbi"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/115761"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01","The student, Kazi Fazle Rabbi, accepted the attached license on 2022-04-14 at 14:48.","The student, Kazi Fazle Rabbi, submitted this Dissertation for approval on 2022-04-14 at 14:50.","This Dissertation was approved for publication on 2022-04-18 at 16:40.","DSpace SAF Submission Ingestion Package generated from Vireo submission #17673 on 2022-11-14 at 09:56:57","Recent advancements in surface nanostructuring have spurred intense interests in their potential for enhanced phase change heat transfer. In this dissertation, novel scalable surface modification methods have been investigated in an attempt to enhance surface condensation performance of conventional and additively manufactured metals. These surfaces: enable jumping droplet condensation in harsh conditions, delay condensation frosting, and enable dropwise condensation of low surface tension liquids. First, a class of tunable micro/nanostructures have been developed on metal additively manufactured AM (AlSi10Mg) surfaces. Optimization of AM nanostructures is shown to achieve better performance when compared to existing nano-structuring techniques on conventional (i.e., aluminum Al-6061) alloys. In addition, experimental results have been presented showing that the AM (AlSi10Mg) alloy having a two-tier nanostructured surface can sustain stable droplet self-repellency via coalescence-induced droplet jumping at high supersaturation (S ≈ 1.8). The condensation performance results in a 600% and 200% enhancement in condensation heat transfer coefficient when compared to filmwise and dropwise condensation, respectively, on nanostructured conventionally manufactured aluminum alloy surfaces. Furthermore, the effect of surface wettability (superhydrophobic, superhydrophilic, and hydrophilic) on condensation frosting delay has been investigated using heat exchanger fins by studying the frost growth rate and how it is affected by different fin pitch, fin surface temperatures and ambient relative humidity. Finally, by combining low hysteresis polymers with a low surface energy coating, a novel omniphobic, substrate independent, solid surface coating has been developed, which can promote the dropwise condensation of low surface tension liquids, including ethanol, hexane, pentane, and a low global warming potential refrigerant."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Surface micro/nano structuring and functionalization for phase change heat transfer enhancement"]}]}],"canonical_facts":{"dc:contributor":["Miljkovic, Nenad","Ferreira, Placid Matthew","Alleyne, Marianne","Wang, Sophie"],"dc:creator":["Fazle Rabbi, Kazi"],"dc:date":["2022-05","2022-04-18"],"dc:description":["Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01","The student, Kazi Fazle Rabbi, accepted the attached license on 2022-04-14 at 14:48.","The student, Kazi Fazle Rabbi, submitted this Dissertation for approval on 2022-04-14 at 14:50.","This Dissertation was approved for publication on 2022-04-18 at 16:40.","DSpace SAF Submission Ingestion Package generated from Vireo submission #17673 on 2022-11-14 at 09:56:57","Recent advancements in surface nanostructuring have spurred intense interests in their potential for enhanced phase change heat transfer. In this dissertation, novel scalable surface modification methods have been investigated in an attempt to enhance surface condensation performance of conventional and additively manufactured metals. These surfaces: enable jumping droplet condensation in harsh conditions, delay condensation frosting, and enable dropwise condensation of low surface tension liquids. First, a class of tunable micro/nanostructures have been developed on metal additively manufactured AM (AlSi10Mg) surfaces. Optimization of AM nanostructures is shown to achieve better performance when compared to existing nano-structuring techniques on conventional (i.e., aluminum Al-6061) alloys. In addition, experimental results have been presented showing that the AM (AlSi10Mg) alloy having a two-tier nanostructured surface can sustain stable droplet self-repellency via coalescence-induced droplet jumping at high supersaturation (S ≈ 1.8). The condensation performance results in a 600% and 200% enhancement in condensation heat transfer coefficient when compared to filmwise and dropwise condensation, respectively, on nanostructured conventionally manufactured aluminum alloy surfaces. Furthermore, the effect of surface wettability (superhydrophobic, superhydrophilic, and hydrophilic) on condensation frosting delay has been investigated using heat exchanger fins by studying the frost growth rate and how it is affected by different fin pitch, fin surface temperatures and ambient relative humidity. Finally, by combining low hysteresis polymers with a low surface energy coating, a novel omniphobic, substrate independent, solid surface coating has been developed, which can promote the dropwise condensation of low surface tension liquids, including ethanol, hexane, pentane, and a low global warming potential refrigerant."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/115761"],"dc:language":["en","eng"],"dc:rights":["© 2022 Kazi Fazle Rabbi"],"dc:subject":["wettability","condensation","frosting","refrigerant","dropwise condensation","nanostructure","microstructure","low surface tension liquid","heat transfer","jumping droplet","superhydrophobic","omniphobic","liquid repellant","refrigeration","metal additive manufacturing"],"dc:title":["Surface micro/nano structuring and functionalization for phase change heat transfer enhancement"],"dc:type":["text","Thesis"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:55Z"}