Graduate Thesis Or Dissertation

 

Extensional Characterization of Weakly-Viscoelastic Fluids : Methods & Applications Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/8k71nk92t

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  • The addition of macromolecules to solvent, even in dilute quantities, can significantly alter a fluid's response in an extensional, or stretching, flow. When high-molecular-weight polymers are extended in solution, extensional thickening can result, yielding viscosities that are orders of magnitude larger than values found in shear. Examples of applications where weakly-viscoelastic fluids are used include inkjet printing, turbulent drag flow reduction, and the atomization of fertilizers and pesticides, and understanding the response of such fluids, particularly in extension, is important for making relevant processing and design decisions. The present research was conducted in an effort to make improvements to and to provide an in-depth assessment of the techniques available for characterizing semi-dilute and dilute polymer solutions. Specifically, old and new methods in capillary breakup extensional rheometry are explored. Outcomes of this work include the creation of two new devices for extensional characterization and the completion of a study comparing a number of previously described extensional techniques in an effort to investigate discrepancies and identify limitations in device usage.
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  • description.provenance : Approved for entry into archive by Laura Wilson(laura.wilson@oregonstate.edu) on 2017-04-21T19:07:34Z (GMT) No. of bitstreams: 1 MarshallKristinA2017.pdf: 8227282 bytes, checksum: 08d41a225c1f663b7684c7e7274276d4 (MD5)
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  • 2017-08-10 to 2018-04-21

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