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Investigation of Weakly Viscoelastic Fluids

Thermal-Fluids Sciences Seminar Series

Friday, January 27, 2017 12:00 PM - 1:00 PM

Dr. Travis Walker
Oregon State University School of CBEE

Abstract
We strive to develop a description of macromolecular dynamics in extensional flow fields for characterization and modeling of dilute polymer solutions. The addition of high molecular weight polymer to solvent, even in dilute amounts, can significantly change a fluid’s response to an extensional flow. This behavior is important when formulating models and assessing the ability to print, spray, jet, and spin complex fluids. Generally, macromolecular solutions exhibit large resistance to stretching deformations known as extensional viscosity. For viscous fluids (>20 mPa·s), a commercial capillary breakup extensional rheometer (CaBER) can be used to characterize the extensional relaxation time and transient extensional viscosity of a solution by quantifying the self-thinning of a stretched liquid bridge formed between two parallel plates. Dilute, aqueous solutions, on the other hand, prove challenging to quantify since the time scale of pinch-off is too short for commercial devices, such as the CaBER, to measure. We are exploring a number of novel techniques, as well as evaluating several previous ideas, to provide a detailed description of low-viscosity elasticity.  Further, we are investigating a variety of industrial applications that are affected by weak viscoelasticity, including rinsing flows, turbulent drag reduction, inkjet printing, harmful algal blooms, subsurface flows, and more.

Bio
Dr. Travis Walker is an Assistant Professor in the School of Chemical, Biological, and Environmental Engineering at Oregon State University.  In 2008, he graduated from South Dakota School of Mines and Technology with a BS in Chemical Engineering and a BS in Applied and Computational Mathematics.  He then completed his MS and PhD degrees in Chemical Engineering at Stanford University in 2010 and 2013 respectively.


Rogers Hall (campus map)
226
Free
Brian Fronk
Brian.Fronk at oregonstate.edu
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