{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/78561"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/78561","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Surface textures and non-Newtonian fluids for decreased friction in full film lubrication","abstract":"Surface texturing has been studied extensively to decrease friction in lubricated sliding contact. The majority of the previous experimental work has focused on symmetric-depth-surface textures. This work examines both symmetric and asymmetric surface textures in order to determine the effects of asymmetry on friction reduction. Gap controlled experiments with Newtonian fluids were performed on a custom tribo-rheometer in order to measure the normal force production and apparent viscosity reduction due to the surface textures. This work shows that symmetry must be broken in order to produce normal forces with surface textures which are caused by viscous effects for gap based Reynolds Number up to 1.21. The experimental results with Newtonian fluids suggest that there is an optimal surface texture configuration for decreasing friction. In order to determine the optimal texture configuration, numerical methods must be used in order to solve a mathematical model describing the lubricated system. The experimental work shows that the normal forces are produced due to viscous effects, allowing the Reynolds equation to be used as the mathematical model for the lubricated system. A pseudo-spectral method is used to solve the Reynolds equation in cylindrical coordinates. Exponential convergence is shown with this solution method and favorable results to the experimental results are shown, validating the numerical method for use in optimization of the surface textures. A recent trend in the lubrication industry has been to add polymer additives to base oils in order to increase their effectiveness as lubricants. These polymer additives, however, cause the oil to become a Non-Newtonian viscoelastic lubricant. The final portion of this work presents the first experimental investigation of surface textures with viscoelastic lubricants in order to determine asymmetric and Non-Newtonian effects on friction reduction. Gap controlled experiments are performed on the same custom tribo-rheometer in order to measure the normal force production and apparent viscosity reduction. This work shows that symmetry must be broken in order to produce normal forces above the viscoelastic response and that an optimal asymmetric texture exists for decreasing friction with viscoelastic lubricants.","abstract_html":"Surface texturing has been studied extensively to decrease friction in lubricated sliding contact. The majority of the previous experimental work has focused on symmetric-depth-surface textures. This work examines both symmetric and asymmetric surface textures in order to determine the effects of asymmetry on friction reduction. Gap controlled experiments with Newtonian fluids were performed on a custom tribo-rheometer in order to measure the normal force production and apparent viscosity reduction due to the surface textures. This work shows that symmetry must be broken in order to produce normal forces with surface textures which are caused by viscous effects for gap based Reynolds Number up to 1.21. The experimental results with Newtonian fluids suggest that there is an optimal surface texture configuration for decreasing friction. In order to determine the optimal texture configuration, numerical methods must be used in order to solve a mathematical model describing the lubricated system. The experimental work shows that the normal forces are produced due to viscous effects, allowing the Reynolds equation to be used as the mathematical model for the lubricated system. A pseudo-spectral method is used to solve the Reynolds equation in cylindrical coordinates. Exponential convergence is shown with this solution method and favorable results to the experimental results are shown, validating the numerical method for use in optimization of the surface textures. A recent trend in the lubrication industry has been to add polymer additives to base oils in order to increase their effectiveness as lubricants. These polymer additives, however, cause the oil to become a Non-Newtonian viscoelastic lubricant. The final portion of this work presents the first experimental investigation of surface textures with viscoelastic lubricants in order to determine asymmetric and Non-Newtonian effects on friction reduction. Gap controlled experiments are performed on the same custom tribo-rheometer in order to measure the normal force production and apparent viscosity reduction. This work shows that symmetry must be broken in order to produce normal forces above the viscoelastic response and that an optimal asymmetric texture exists for decreasing friction with viscoelastic lubricants.","abstract_has_math":false,"creators":["Schuh, Jonathon Kenneth"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-07-22T22:18:18Z","date_published":"2015-07-22T22:18:18Z","updated_at":"2026-07-22T22:26:11Z","subjects":["Lubrication","Surface Textures","Non-Newtonian Fluids","Reynolds Equation"],"languages":["en"],"rights":["Copyright 2015 Jonathon Schuh"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/78561","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Schuh, Jonathon Kenneth"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-07-22T22:18:18Z","2015-05","2015-05-01","2015-5"]},{"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":["Lubrication","Surface Textures","Non-Newtonian Fluids","Reynolds Equation"]}]},{"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 Jonathon Schuh"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/78561"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Surface texturing has been studied extensively to decrease friction in lubricated sliding contact. The majority of the previous experimental work has focused on symmetric-depth-surface textures. This work examines both symmetric and asymmetric surface textures in order to determine the effects of asymmetry on friction reduction. Gap controlled experiments with Newtonian fluids were performed on a custom tribo-rheometer in order to measure the normal force production and apparent viscosity reduction due to the surface textures. This work shows that symmetry must be broken in order to produce normal forces with surface textures which are caused by viscous effects for gap based Reynolds Number up to 1.21. The experimental results with Newtonian fluids suggest that there is an optimal surface texture configuration for decreasing friction. In order to determine the optimal texture configuration, numerical methods must be used in order to solve a mathematical model describing the lubricated system. The experimental work shows that the normal forces are produced due to viscous effects, allowing the Reynolds equation to be used as the mathematical model for the lubricated system. A pseudo-spectral method is used to solve the Reynolds equation in cylindrical coordinates. Exponential convergence is shown with this solution method and favorable results to the experimental results are shown, validating the numerical method for use in optimization of the surface textures. A recent trend in the lubrication industry has been to add polymer additives to base oils in order to increase their effectiveness as lubricants. These polymer additives, however, cause the oil to become a Non-Newtonian viscoelastic lubricant. The final portion of this work presents the first experimental investigation of surface textures with viscoelastic lubricants in order to determine asymmetric and Non-Newtonian effects on friction reduction. Gap controlled experiments are performed on the same custom tribo-rheometer in order to measure the normal force production and apparent viscosity reduction. This work shows that symmetry must be broken in order to produce normal forces above the viscoelastic response and that an optimal asymmetric texture exists for decreasing friction with viscoelastic lubricants.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2015-07-22 without embargo terms","The student, Jonathon Schuh, accepted the attached license on 2015-04-30 at 11:57.","The student, Jonathon Schuh, submitted this Thesis for approval on 2015-04-30 at 11:57.","This Thesis was approved for publication on 2015-05-01 at 11:04.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8211 on 2015-07-22 at 10:35:11","Made available in DSpace on 2015-07-22T22:18:18Z (GMT). No. of bitstreams: 2 SCHUH-THESIS-2015.pdf: 21365515 bytes, checksum: 60e01af5daa61697c9821f79d6be0628 (MD5) LICENSE.txt: 4211 bytes, checksum: 5c7099df03440419f081249769d132a6 (MD5) Previous issue date: 2015-05-01"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Surface textures and non-Newtonian fluids for decreased friction in full film lubrication"]}]}],"canonical_facts":{"dc:creator":["Schuh, Jonathon Kenneth"],"dc:date":["2015-07-22T22:18:18Z","2015-05","2015-05-01","2015-5"],"dc:description":["Surface texturing has been studied extensively to decrease friction in lubricated sliding contact. The majority of the previous experimental work has focused on symmetric-depth-surface textures. This work examines both symmetric and asymmetric surface textures in order to determine the effects of asymmetry on friction reduction. Gap controlled experiments with Newtonian fluids were performed on a custom tribo-rheometer in order to measure the normal force production and apparent viscosity reduction due to the surface textures. This work shows that symmetry must be broken in order to produce normal forces with surface textures which are caused by viscous effects for gap based Reynolds Number up to 1.21. The experimental results with Newtonian fluids suggest that there is an optimal surface texture configuration for decreasing friction. In order to determine the optimal texture configuration, numerical methods must be used in order to solve a mathematical model describing the lubricated system. The experimental work shows that the normal forces are produced due to viscous effects, allowing the Reynolds equation to be used as the mathematical model for the lubricated system. A pseudo-spectral method is used to solve the Reynolds equation in cylindrical coordinates. Exponential convergence is shown with this solution method and favorable results to the experimental results are shown, validating the numerical method for use in optimization of the surface textures. A recent trend in the lubrication industry has been to add polymer additives to base oils in order to increase their effectiveness as lubricants. These polymer additives, however, cause the oil to become a Non-Newtonian viscoelastic lubricant. The final portion of this work presents the first experimental investigation of surface textures with viscoelastic lubricants in order to determine asymmetric and Non-Newtonian effects on friction reduction. Gap controlled experiments are performed on the same custom tribo-rheometer in order to measure the normal force production and apparent viscosity reduction. This work shows that symmetry must be broken in order to produce normal forces above the viscoelastic response and that an optimal asymmetric texture exists for decreasing friction with viscoelastic lubricants.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2015-07-22 without embargo terms","The student, Jonathon Schuh, accepted the attached license on 2015-04-30 at 11:57.","The student, Jonathon Schuh, submitted this Thesis for approval on 2015-04-30 at 11:57.","This Thesis was approved for publication on 2015-05-01 at 11:04.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8211 on 2015-07-22 at 10:35:11","Made available in DSpace on 2015-07-22T22:18:18Z (GMT). No. of bitstreams: 2 SCHUH-THESIS-2015.pdf: 21365515 bytes, checksum: 60e01af5daa61697c9821f79d6be0628 (MD5) LICENSE.txt: 4211 bytes, checksum: 5c7099df03440419f081249769d132a6 (MD5) Previous issue date: 2015-05-01"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/78561"],"dc:language":["en"],"dc:rights":["Copyright 2015 Jonathon Schuh"],"dc:subject":["Lubrication","Surface Textures","Non-Newtonian Fluids","Reynolds Equation"],"dc:title":["Surface textures and non-Newtonian fluids for decreased friction in full film lubrication"],"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":"2026-07-22T22:26:11Z"}