{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/115617"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/115617","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Oil migration and property change at compressor suction and discharge","abstract":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01","abstract_html":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01","abstract_has_math":false,"creators":["Wang, Xin"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Elbel, Stefan"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-05","date_published":"2022-05","updated_at":"2026-07-22T22:24:54Z","subjects":["Oil migration","Oil property","Compressor","Oil-refrigerant mixture"],"languages":["en","eng"],"rights":["Copyright 2022 Xin Wang"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/115617","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Elbel, Stefan"]},{"key":"dc:creator","label":"Author","values":["Wang, Xin"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2022-05","2022-04-28"]},{"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":["Oil migration","Oil property","Compressor","Oil-refrigerant mixture"]}]},{"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 2022 Xin Wang"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/115617"]}]},{"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 2024-05-01","The student, Xin Wang, accepted the attached license on 2022-04-26 at 18:05.","The student, Xin Wang, submitted this Thesis for approval on 2022-04-26 at 18:05.","This Thesis was approved for publication on 2022-04-28 at 13:01.","DSpace SAF Submission Ingestion Package generated from Vireo submission #17968 on 2022-11-11 at 12:12:08","The oil migration has great impact on the vapor compression systems, especially for systems that require frequent on-off cycling. Excessive amount of oil retained in the system and lack of oil return to the compressor can cause low system efficiency and potential compressor failure. This thesis aims at exploring oil-refrigerant mixture properties during startup and shutdown period at different locations in the system. The variation of temperature and pressure would result in different mixture concentrations and properties. Oil properties like solubility, viscosity, density, surface tension and contact angle can be influenced and will affect system performance. Warm and cold startup conditions are recorded and compared. Oil flow during startup is different from the annular mist flow in steady-state conditions. Oil flow is composed of oil droplets traveling with refrigerant vapor flow and oil film attached to the inner wall of discharge tube. During startup, small oil droplets are carried by vapor refrigerant to the discharge where some of droplets are attached to the tube wall and form film flow in low velocity, others coalesce into larger droplets. During the compressor shutdown, the oil flow in contact with the inner wall of discharge stops immediately with while oil droplets in the vapor core flow slower and stop gradually. In the end, oil droplets flow down and coalesce with oil film to accumulate at the bottom of the tube. The high-speed camera and video analysis method are used to analysis oil migration and show variation of surface tension, viscosity, and wettability. Properties of mixture like solubility, density, saturation pressure and viscosity are predicted by existing models."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Oil migration and property change at compressor suction and discharge"]}]}],"canonical_facts":{"dc:contributor":["Elbel, Stefan"],"dc:creator":["Wang, Xin"],"dc:date":["2022-05","2022-04-28"],"dc:description":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01","The student, Xin Wang, accepted the attached license on 2022-04-26 at 18:05.","The student, Xin Wang, submitted this Thesis for approval on 2022-04-26 at 18:05.","This Thesis was approved for publication on 2022-04-28 at 13:01.","DSpace SAF Submission Ingestion Package generated from Vireo submission #17968 on 2022-11-11 at 12:12:08","The oil migration has great impact on the vapor compression systems, especially for systems that require frequent on-off cycling. Excessive amount of oil retained in the system and lack of oil return to the compressor can cause low system efficiency and potential compressor failure. This thesis aims at exploring oil-refrigerant mixture properties during startup and shutdown period at different locations in the system. The variation of temperature and pressure would result in different mixture concentrations and properties. Oil properties like solubility, viscosity, density, surface tension and contact angle can be influenced and will affect system performance. Warm and cold startup conditions are recorded and compared. Oil flow during startup is different from the annular mist flow in steady-state conditions. Oil flow is composed of oil droplets traveling with refrigerant vapor flow and oil film attached to the inner wall of discharge tube. During startup, small oil droplets are carried by vapor refrigerant to the discharge where some of droplets are attached to the tube wall and form film flow in low velocity, others coalesce into larger droplets. During the compressor shutdown, the oil flow in contact with the inner wall of discharge stops immediately with while oil droplets in the vapor core flow slower and stop gradually. In the end, oil droplets flow down and coalesce with oil film to accumulate at the bottom of the tube. The high-speed camera and video analysis method are used to analysis oil migration and show variation of surface tension, viscosity, and wettability. Properties of mixture like solubility, density, saturation pressure and viscosity are predicted by existing models."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/115617"],"dc:language":["en","eng"],"dc:rights":["Copyright 2022 Xin Wang"],"dc:subject":["Oil migration","Oil property","Compressor","Oil-refrigerant mixture"],"dc:title":["Oil migration and property change at compressor suction and discharge"],"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"}