{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/108176"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/108176","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Experimental setups for studying homogeneous-isotropic and rotating turbulence in clay suspensions: Preliminary results","abstract":"Homogeneous and isotropic turbulence (HIT) has been at the center of a vast span of research seeking fundamental understanding and insights on the phenomenon of turbulence, which is ubiquitous in nature as well as engineering. The HIT assumption greatly simplifies the analytical treatment of turbulence, however creating truly HIT conditions in experiments has still remained a challenge and most research has focused on Newtonian fluids. Here we uses two different approaches to create HIT in water and aqueous suspension of Laponite clay, a shear-thinning fluid. The first approach involving flow actuators placed symmetrically around an enclosed volume has been used by past studies for creating small regions of HIT in gaseous media. We show using planar particle image velocimetry that our HIT setup is capable of producing low Taylor microscale Reynolds number HIT region of 20 mm x 20 mm in liquid media. Comparison of temporal spectra in water and aqueous clay suspension cases showed that presence of clay significantly alters the scaling of the inertial subrange and increases the Taylor microscale Reynolds number, in addition to suppressing the mean flow. The second approach uses random actuation of jets to stir fluid in a tank, which has been used by past studies to create large HIT regions. We have built a smaller version of this concept with the aim to create high Taylor microscale Reynolds number flow in water and clay suspensions.","abstract_html":"Homogeneous and isotropic turbulence (HIT) has been at the center of a vast span of research seeking fundamental understanding and insights on the phenomenon of turbulence, which is ubiquitous in nature as well as engineering. The HIT assumption greatly simplifies the analytical treatment of turbulence, however creating truly HIT conditions in experiments has still remained a challenge and most research has focused on Newtonian fluids. Here we uses two different approaches to create HIT in water and aqueous suspension of Laponite clay, a shear-thinning fluid. The first approach involving flow actuators placed symmetrically around an enclosed volume has been used by past studies for creating small regions of HIT in gaseous media. We show using planar particle image velocimetry that our HIT setup is capable of producing low Taylor microscale Reynolds number HIT region of 20 mm x 20 mm in liquid media. Comparison of temporal spectra in water and aqueous clay suspension cases showed that presence of clay significantly alters the scaling of the inertial subrange and increases the Taylor microscale Reynolds number, in addition to suppressing the mean flow. The second approach uses random actuation of jets to stir fluid in a tank, which has been used by past studies to create large HIT regions. We have built a smaller version of this concept with the aim to create high Taylor microscale Reynolds number flow in water and clay suspensions.","abstract_has_math":false,"creators":["Tipnis, Vaibhav Vinay"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Chamorro, Leonardo P","Best, Jim"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2020,"date_issued":"2020-08-26T23:58:45Z","date_published":"2020-08-26T23:58:45Z","updated_at":"2026-07-22T22:24:47Z","subjects":["Homogeneous-isotropic turbulence","Laponite clay suspension","PIV","non-Newtonian fluid","Taylor-Couette flow"],"languages":["en"],"rights":["Copyright 2020 Vaibhav Vinay Tipnis"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/108176","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Chamorro, Leonardo P","Best, Jim"]},{"key":"dc:creator","label":"Author","values":["Tipnis, Vaibhav Vinay"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2020-08-26T23:58:45Z","2022-08-26T23:58:55Z","2020-05-13","2020-05"]},{"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":["Homogeneous-isotropic turbulence","Laponite clay suspension","PIV","non-Newtonian fluid","Taylor-Couette flow"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2020 Vaibhav Vinay Tipnis"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/108176"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Homogeneous and isotropic turbulence (HIT) has been at the center of a vast span of research seeking fundamental understanding and insights on the phenomenon of turbulence, which is ubiquitous in nature as well as engineering. The HIT assumption greatly simplifies the analytical treatment of turbulence, however creating truly HIT conditions in experiments has still remained a challenge and most research has focused on Newtonian fluids. Here we uses two different approaches to create HIT in water and aqueous suspension of Laponite clay, a shear-thinning fluid. The first approach involving flow actuators placed symmetrically around an enclosed volume has been used by past studies for creating small regions of HIT in gaseous media. We show using planar particle image velocimetry that our HIT setup is capable of producing low Taylor microscale Reynolds number HIT region of 20 mm x 20 mm in liquid media. Comparison of temporal spectra in water and aqueous clay suspension cases showed that presence of clay significantly alters the scaling of the inertial subrange and increases the Taylor microscale Reynolds number, in addition to suppressing the mean flow. The second approach uses random actuation of jets to stir fluid in a tank, which has been used by past studies to create large HIT regions. We have built a smaller version of this concept with the aim to create high Taylor microscale Reynolds number flow in water and clay suspensions.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2022-05-01","The student, Vaibhav Vinay Tipnis, accepted the attached license on 2020-05-08 at 16:14.","The student, Vaibhav Vinay Tipnis, submitted this Thesis for approval on 2020-05-08 at 16:39.","This Thesis was approved for publication on 2020-05-13 at 07:30.","DSpace SAF Submission Ingestion Package generated from Vireo submission #15303 on 2020-08-25 at 17:30:47","Made available in DSpace on 2020-08-26T23:58:45Z (GMT). No. of bitstreams: 2 TIPNIS-THESIS-2020.pdf: 1605244 bytes, checksum: 10cc429552b45d04fe6f627e5a7f1ebc (MD5) LICENSE.txt: 4217 bytes, checksum: 302b858d8e3307f5b2fff6287a833d4d (MD5) Previous issue date: 2020-05-13","Embargo set by: Seth Robbins for item 115789 Lift date: 2022-08-26T23:58:55Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Experimental setups for studying homogeneous-isotropic and rotating turbulence in clay suspensions: Preliminary results"]}]}],"canonical_facts":{"dc:contributor":["Chamorro, Leonardo P","Best, Jim"],"dc:creator":["Tipnis, Vaibhav Vinay"],"dc:date":["2020-08-26T23:58:45Z","2022-08-26T23:58:55Z","2020-05-13","2020-05"],"dc:description":["Homogeneous and isotropic turbulence (HIT) has been at the center of a vast span of research seeking fundamental understanding and insights on the phenomenon of turbulence, which is ubiquitous in nature as well as engineering. The HIT assumption greatly simplifies the analytical treatment of turbulence, however creating truly HIT conditions in experiments has still remained a challenge and most research has focused on Newtonian fluids. Here we uses two different approaches to create HIT in water and aqueous suspension of Laponite clay, a shear-thinning fluid. The first approach involving flow actuators placed symmetrically around an enclosed volume has been used by past studies for creating small regions of HIT in gaseous media. We show using planar particle image velocimetry that our HIT setup is capable of producing low Taylor microscale Reynolds number HIT region of 20 mm x 20 mm in liquid media. Comparison of temporal spectra in water and aqueous clay suspension cases showed that presence of clay significantly alters the scaling of the inertial subrange and increases the Taylor microscale Reynolds number, in addition to suppressing the mean flow. The second approach uses random actuation of jets to stir fluid in a tank, which has been used by past studies to create large HIT regions. We have built a smaller version of this concept with the aim to create high Taylor microscale Reynolds number flow in water and clay suspensions.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2022-05-01","The student, Vaibhav Vinay Tipnis, accepted the attached license on 2020-05-08 at 16:14.","The student, Vaibhav Vinay Tipnis, submitted this Thesis for approval on 2020-05-08 at 16:39.","This Thesis was approved for publication on 2020-05-13 at 07:30.","DSpace SAF Submission Ingestion Package generated from Vireo submission #15303 on 2020-08-25 at 17:30:47","Made available in DSpace on 2020-08-26T23:58:45Z (GMT). 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