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No. of bitstreams: 9 KOCH-DISSERTATION-2017.pdf: 50624702 bytes, checksum: f3e68c494df9420b9f4d386c1b05f99c (MD5) jakoch2_LaTeX_src.zip: 52005063 bytes, checksum: 9af5cc375da07488897271c67c680e44 (MD5) LICENSE.txt: 4208 bytes, checksum: 4a240a1643c4470009b4322175a7ddbd (MD5) PROQUEST_LICENSE.txt: 4554 bytes, checksum: b6833ab470ed1ab72bf5130c65202df1 (MD5) jop_copyright.pdf: 145495 bytes, checksum: fc5b9d5b980b798ec56a33cf55e7d8d4 (MD5) kim_copyright.pdf: 169411 bytes, checksum: 86bc27b14fadbbf920f9da264fa36aa5 (MD5) mewis_copyright.pdf: 193507 bytes, checksum: 5d1f4f70e254724b3b50b19d738ea89b (MD5) piau_copyright.pdf: 193118 bytes, checksum: b40b21efdfd105f767edfaa4e9733f6b (MD5) roberts_copyright.pdf: 169889 bytes, checksum: 436802ec6703ea04f4e8b22abfabc64e (MD5) Previous issue date: 2017-12-08","Embargo set by: Seth Robbins for item 105181 Lift date: 2020-03-13T15:25:40Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Embargo set by: Seth Robbins for item 105181 Lift date: 2020-03-13T15:28:52Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","A yield-stress fluid behaves effectively as a solid for stresses below a critical threshold. Examples include soap foam, peanut butter, aloe gel, and sand -- materials that can hold their shape under their own weight, but which can be reversibly reshaped by external forces. Notably, yield-stress fluids are capable of suspending macroscopic particles much larger than the size of a fluid structural element, preventing the particles from either rising with buoyancy or sinking due to their weight. Of course, these particles can be put in motion by stirring the fluid, but there are other means by which the particles can be displaced. We focus on two complex flow scenarios in which initially suspended density-mismatched particles are set in motion by external conditions. In the first, the motion of air bubbles in fresh concrete is considered. Simple model materials, a well-studied yield-stress fluid (Carbopol in water) and a granular medium (millimetric glass beads in silicone oil), are compared to fresh concrete in lab-scale vibration experiments and rheology measurements. The granular medium demonstrates the same fluidization phenomenon as the fresh concrete in response to vibration, suggesting granular force-chain dynamics can rationalize the effect of vibration on concrete. This understanding is used to explain the mechanism of air bubble motion during vibration. More fundamental questions are raised, however, since both Carbopol and the granular medium are jammed, repulsive systems characterized as soft glassy materials -- systems of disordered, metastable particles unified under a common rheological behavior. Two parameters are proposed to distinguish granular materials, and the use of these parameters is demonstrated with the model materials. In a second study, an isolated particle in a nongranular yield-stress fluid whose container is subject to abrupt accelerations is considered. Through careful choice of fluid properties and acceleration forcing function, counterintuitive behaviors are experimentally observed: sinking air bubbles and rising steel spheres. This phenomenon is rationalized with theory, but new considerations are necessary for a quantitative analysis. A modification to a suspension criterion found in the literature is proposed to account for rigid-body accelerations, and its viability is tested in a novel experiment. Additionally, the yield stress measurement for this scenario is reconsidered: Is the steady-state rheology necessarily relevant to a flow occurring on a timescale of hundredths of seconds? Using a new interpretation of the input conditions in strain-controlled rheological tests, transient rheology measurements are made that are more emblematic of the flow conditions seen in the sinking bubble phenomenon. It is demonstrated that the yield stress can be a function of the deformation timescale of the flow, and when this transient yield stress is factored into the modified suspension criterion, the critical value observed during the sinking bubble phenomenon is placed into agreement with the critical value for quasi-static flow.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2019-12-01","The student, Jeremy Koch, accepted the attached license on 2017-12-01 at 13:51.","The student, Jeremy Koch, submitted this Dissertation for approval on 2017-12-07 at 14:57.","This Dissertation was approved for publication on 2017-12-08 at 08:13.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11803 on 2018-03-13 at 09:56:23","U of I Only Restriction Lifted for Item 105181 on 2020-03-14T09:15:22Z."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Shaking, slamming, and vibrating yield-stress fluids: Inducing particle motion in rheologically-complex materials"]}]}],"canonical_facts":{"dc:contributor":["Ewoldt, Randy H.","Lange, David A.","Pearlstein, Arne J.","Smith, Kyle C."],"dc:creator":["Koch, Jeremy Alexander"],"dc:date":["2018-03-13T15:25:20Z","2020-03-14T09:15:22Z","2017-12-08","2017-12"],"dc:description":["Made available in DSpace on 2018-03-13T15:25:20Z (GMT). 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Examples include soap foam, peanut butter, aloe gel, and sand -- materials that can hold their shape under their own weight, but which can be reversibly reshaped by external forces. Notably, yield-stress fluids are capable of suspending macroscopic particles much larger than the size of a fluid structural element, preventing the particles from either rising with buoyancy or sinking due to their weight. Of course, these particles can be put in motion by stirring the fluid, but there are other means by which the particles can be displaced. We focus on two complex flow scenarios in which initially suspended density-mismatched particles are set in motion by external conditions. In the first, the motion of air bubbles in fresh concrete is considered. Simple model materials, a well-studied yield-stress fluid (Carbopol in water) and a granular medium (millimetric glass beads in silicone oil), are compared to fresh concrete in lab-scale vibration experiments and rheology measurements. The granular medium demonstrates the same fluidization phenomenon as the fresh concrete in response to vibration, suggesting granular force-chain dynamics can rationalize the effect of vibration on concrete. This understanding is used to explain the mechanism of air bubble motion during vibration. More fundamental questions are raised, however, since both Carbopol and the granular medium are jammed, repulsive systems characterized as soft glassy materials -- systems of disordered, metastable particles unified under a common rheological behavior. Two parameters are proposed to distinguish granular materials, and the use of these parameters is demonstrated with the model materials. In a second study, an isolated particle in a nongranular yield-stress fluid whose container is subject to abrupt accelerations is considered. Through careful choice of fluid properties and acceleration forcing function, counterintuitive behaviors are experimentally observed: sinking air bubbles and rising steel spheres. This phenomenon is rationalized with theory, but new considerations are necessary for a quantitative analysis. A modification to a suspension criterion found in the literature is proposed to account for rigid-body accelerations, and its viability is tested in a novel experiment. Additionally, the yield stress measurement for this scenario is reconsidered: Is the steady-state rheology necessarily relevant to a flow occurring on a timescale of hundredths of seconds? Using a new interpretation of the input conditions in strain-controlled rheological tests, transient rheology measurements are made that are more emblematic of the flow conditions seen in the sinking bubble phenomenon. 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