{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/99255"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/99255","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Water droplet growth enhancement through thermal radiation","abstract":"This thesis explores how thermal radiation affects water droplet growth in the 20 to 100 μm size range. The theory of mass and energy transfer involving thermal radiation for a single droplet is presented. This theory is then extended to predict droplet growth for a given droplet distribution exposed to a controlled radiative sink. In the model, mass and energy transfer between the droplets and their surroundings are considered. The theoretical model predicts that droplets above approximately 2 μm will experience growth by condensation while smaller droplets will experience evaporation. An experiment was also conducted to measure the effect thermal radiation has on a droplet distribution and was compared to calculations from the theoretical model. Experimental data shows droplet growth occurring at a much higher rate than theoretical predictions. This leads the author to believe either the theoretical model is ignoring another growth mechanism or there is a limiting assumption being implemented in the model. Droplet growth is shown, theoretically and experimentally, to be in agreement with the time scales of droplet growth observed in nature. The time for a small droplet to achieve the size of a rain drop is predicted in this model to be on the order of minutes. Ignoring thermal radiation results in a time scale on the order of days rather than minutes.","abstract_html":"This thesis explores how thermal radiation affects water droplet growth in the 20 to 100 μm size range. The theory of mass and energy transfer involving thermal radiation for a single droplet is presented. This theory is then extended to predict droplet growth for a given droplet distribution exposed to a controlled radiative sink. In the model, mass and energy transfer between the droplets and their surroundings are considered. The theoretical model predicts that droplets above approximately 2 μm will experience growth by condensation while smaller droplets will experience evaporation. An experiment was also conducted to measure the effect thermal radiation has on a droplet distribution and was compared to calculations from the theoretical model. Experimental data shows droplet growth occurring at a much higher rate than theoretical predictions. This leads the author to believe either the theoretical model is ignoring another growth mechanism or there is a limiting assumption being implemented in the model. Droplet growth is shown, theoretically and experimentally, to be in agreement with the time scales of droplet growth observed in nature. The time for a small droplet to achieve the size of a rain drop is predicted in this model to be on the order of minutes. Ignoring thermal radiation results in a time scale on the order of days rather than minutes.","abstract_has_math":false,"creators":["McNichols, Ezra Owen"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Brewster, Quinn"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2018,"date_issued":"2018-03-13T15:28:42Z","date_published":"2018-03-13T15:28:42Z","updated_at":"2026-07-22T22:24:37Z","subjects":["Water","Droplet","Radiation"],"languages":["en"],"rights":["Copyright 2017 Ezra McNichols"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/99255","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Brewster, Quinn"]},{"key":"dc:creator","label":"Author","values":["McNichols, Ezra Owen"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2018-03-13T15:28:42Z","2020-03-14T09:15:12Z","2017-12-12","2017-12"]},{"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":["Water","Droplet","Radiation"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2017 Ezra McNichols"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/99255"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This thesis explores how thermal radiation affects water droplet growth in the 20 to 100 μm size range. The theory of mass and energy transfer involving thermal radiation for a single droplet is presented. This theory is then extended to predict droplet growth for a given droplet distribution exposed to a controlled radiative sink. In the model, mass and energy transfer between the droplets and their surroundings are considered. The theoretical model predicts that droplets above approximately 2 μm will experience growth by condensation while smaller droplets will experience evaporation. An experiment was also conducted to measure the effect thermal radiation has on a droplet distribution and was compared to calculations from the theoretical model. Experimental data shows droplet growth occurring at a much higher rate than theoretical predictions. This leads the author to believe either the theoretical model is ignoring another growth mechanism or there is a limiting assumption being implemented in the model. Droplet growth is shown, theoretically and experimentally, to be in agreement with the time scales of droplet growth observed in nature. The time for a small droplet to achieve the size of a rain drop is predicted in this model to be on the order of minutes. Ignoring thermal radiation results in a time scale on the order of days rather than minutes.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2019-12-01","The student, Ezra McNichols, accepted the attached license on 2017-12-11 at 16:23.","The student, Ezra McNichols, submitted this Thesis for approval on 2017-12-11 at 16:28.","This Thesis was approved for publication on 2017-12-12 at 17:05.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11943 on 2018-03-13 at 09:57:45","Made available in DSpace on 2018-03-13T15:28:42Z (GMT). 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The theory of mass and energy transfer involving thermal radiation for a single droplet is presented. This theory is then extended to predict droplet growth for a given droplet distribution exposed to a controlled radiative sink. In the model, mass and energy transfer between the droplets and their surroundings are considered. The theoretical model predicts that droplets above approximately 2 μm will experience growth by condensation while smaller droplets will experience evaporation. An experiment was also conducted to measure the effect thermal radiation has on a droplet distribution and was compared to calculations from the theoretical model. Experimental data shows droplet growth occurring at a much higher rate than theoretical predictions. This leads the author to believe either the theoretical model is ignoring another growth mechanism or there is a limiting assumption being implemented in the model. Droplet growth is shown, theoretically and experimentally, to be in agreement with the time scales of droplet growth observed in nature. The time for a small droplet to achieve the size of a rain drop is predicted in this model to be on the order of minutes. Ignoring thermal radiation results in a time scale on the order of days rather than minutes.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2019-12-01","The student, Ezra McNichols, accepted the attached license on 2017-12-11 at 16:23.","The student, Ezra McNichols, submitted this Thesis for approval on 2017-12-11 at 16:28.","This Thesis was approved for publication on 2017-12-12 at 17:05.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11943 on 2018-03-13 at 09:57:45","Made available in DSpace on 2018-03-13T15:28:42Z (GMT). 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