{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/89069"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/89069","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Effect of longitudinal micro fin tube enhancement in evaporation of R410A","abstract":"An experimental investigation of evaporating heat transfer was conducted for smooth and coaxial micro-finned aluminum tubes with an internal diameter of 6.3 mm. The study used R410A at a saturation temperature of 10 °C running at mass fluxes from 100 to 250 kg/m2-s, heat fluxes from 4 to 14 kW/m2, and qualities from 0.1 to 0.8. The testing facility had a 15 cm long test section heated by a secondary heated water loop, a transparent visualization section which used a high-speed camera to capture flow regimes, and vertical and horizontal pressure drop test sections. The micro-finned enhancement factors were 1.14-1.85, 0.91-1.72, and 1.05-1.66 for heat fluxes of 4, 9 and 14 kW/m2 correspondingly. Calculations for the finned tube used the molten diameter surface. Flow regimes were similar for both tubes, except for qualities tested, and the regimes were correctly predicted by Cheng et al. (2008). Images of the flow regimes were captured for each testing quality and for mass fluxes. Pressure drop in the micro-finned tube was higher than the smooth tube for both horizontal and vertical tube orientations. The difference in pressure drop increased with higher vapor quality.","abstract_html":"An experimental investigation of evaporating heat transfer was conducted for smooth and coaxial micro-finned aluminum tubes with an internal diameter of 6.3 mm. The study used R410A at a saturation temperature of 10 °C running at mass fluxes from 100 to 250 kg/m2-s, heat fluxes from 4 to 14 kW/m2, and qualities from 0.1 to 0.8. The testing facility had a 15 cm long test section heated by a secondary heated water loop, a transparent visualization section which used a high-speed camera to capture flow regimes, and vertical and horizontal pressure drop test sections. The micro-finned enhancement factors were 1.14-1.85, 0.91-1.72, and 1.05-1.66 for heat fluxes of 4, 9 and 14 kW/m2 correspondingly. Calculations for the finned tube used the molten diameter surface. Flow regimes were similar for both tubes, except for qualities tested, and the regimes were correctly predicted by Cheng et al. (2008). Images of the flow regimes were captured for each testing quality and for mass fluxes. Pressure drop in the micro-finned tube was higher than the smooth tube for both horizontal and vertical tube orientations. The difference in pressure drop increased with higher vapor quality.","abstract_has_math":false,"creators":["Vivanco Obeso, Sergio Daniel"],"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, Predrag S."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2016,"date_issued":"2016-03-02T19:34:36Z","date_published":"2016-03-02T19:34:36Z","updated_at":"2026-07-22T22:26:32Z","subjects":["heat transfer coefficient","micro fin tube enhancement"],"languages":["en"],"rights":["Copyright 2015 Sergio Daniel Vivanco Obeso"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/89069","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Hrnjak, Predrag S."]},{"key":"dc:creator","label":"Author","values":["Vivanco Obeso, Sergio Daniel"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2016-03-02T19:34:36Z","2015-12-09","2015-12"]},{"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":["heat transfer coefficient","micro fin tube enhancement"]}]},{"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 Sergio Daniel Vivanco Obeso"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/89069"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["An experimental investigation of evaporating heat transfer was conducted for smooth and coaxial micro-finned aluminum tubes with an internal diameter of 6.3 mm. The study used R410A at a saturation temperature of 10 °C running at mass fluxes from 100 to 250 kg/m2-s, heat fluxes from 4 to 14 kW/m2, and qualities from 0.1 to 0.8. The testing facility had a 15 cm long test section heated by a secondary heated water loop, a transparent visualization section which used a high-speed camera to capture flow regimes, and vertical and horizontal pressure drop test sections. The micro-finned enhancement factors were 1.14-1.85, 0.91-1.72, and 1.05-1.66 for heat fluxes of 4, 9 and 14 kW/m2 correspondingly. Calculations for the finned tube used the molten diameter surface. Flow regimes were similar for both tubes, except for qualities tested, and the regimes were correctly predicted by Cheng et al. (2008). Images of the flow regimes were captured for each testing quality and for mass fluxes. Pressure drop in the micro-finned tube was higher than the smooth tube for both horizontal and vertical tube orientations. The difference in pressure drop increased with higher vapor quality.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2016-03-02 without embargo terms","The student, Sergio Vivanco Obeso, accepted the attached license on 2015-12-08 at 10:39.","The student, Sergio Vivanco Obeso, submitted this Thesis for approval on 2015-12-08 at 10:49.","This Thesis was approved for publication on 2015-12-09 at 16:11.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8966 on 2016-03-02 at 12:52:01","Made available in DSpace on 2016-03-02T19:34:36Z (GMT). No. of bitstreams: 2 VIVANCOOBESO-THESIS-2015.pdf: 5856589 bytes, checksum: 771560900eeecfdb0c3a41765a83b5c8 (MD5) LICENSE.txt: 4209 bytes, checksum: eefeed195fff25fb92a919cf26a86596 (MD5) Previous issue date: 2015-12-09"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Effect of longitudinal micro fin tube enhancement in evaporation of R410A"]}]}],"canonical_facts":{"dc:contributor":["Hrnjak, Predrag S."],"dc:creator":["Vivanco Obeso, Sergio Daniel"],"dc:date":["2016-03-02T19:34:36Z","2015-12-09","2015-12"],"dc:description":["An experimental investigation of evaporating heat transfer was conducted for smooth and coaxial micro-finned aluminum tubes with an internal diameter of 6.3 mm. The study used R410A at a saturation temperature of 10 °C running at mass fluxes from 100 to 250 kg/m2-s, heat fluxes from 4 to 14 kW/m2, and qualities from 0.1 to 0.8. The testing facility had a 15 cm long test section heated by a secondary heated water loop, a transparent visualization section which used a high-speed camera to capture flow regimes, and vertical and horizontal pressure drop test sections. The micro-finned enhancement factors were 1.14-1.85, 0.91-1.72, and 1.05-1.66 for heat fluxes of 4, 9 and 14 kW/m2 correspondingly. Calculations for the finned tube used the molten diameter surface. Flow regimes were similar for both tubes, except for qualities tested, and the regimes were correctly predicted by Cheng et al. (2008). Images of the flow regimes were captured for each testing quality and for mass fluxes. Pressure drop in the micro-finned tube was higher than the smooth tube for both horizontal and vertical tube orientations. The difference in pressure drop increased with higher vapor quality.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2016-03-02 without embargo terms","The student, Sergio Vivanco Obeso, accepted the attached license on 2015-12-08 at 10:39.","The student, Sergio Vivanco Obeso, submitted this Thesis for approval on 2015-12-08 at 10:49.","This Thesis was approved for publication on 2015-12-09 at 16:11.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8966 on 2016-03-02 at 12:52:01","Made available in DSpace on 2016-03-02T19:34:36Z (GMT). No. of bitstreams: 2 VIVANCOOBESO-THESIS-2015.pdf: 5856589 bytes, checksum: 771560900eeecfdb0c3a41765a83b5c8 (MD5) LICENSE.txt: 4209 bytes, checksum: eefeed195fff25fb92a919cf26a86596 (MD5) Previous issue date: 2015-12-09"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/89069"],"dc:language":["en"],"dc:rights":["Copyright 2015 Sergio Daniel Vivanco Obeso"],"dc:subject":["heat transfer coefficient","micro fin tube enhancement"],"dc:title":["Effect of longitudinal micro fin tube enhancement in evaporation of R410A"],"dc:type":["text"],"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":"2026-07-22T22:26:32Z"}