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The Hydrodynamic Interaction of Two Small Freely-moving Particles in a Couette Flow of a Yield Stress Fluid

Firouznia, Mohammadhossein
http://orcid.org/0000-0002-5358-8675
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1502901401749626

Abstract Details

2017, Master of Science (MS), Ohio University, Mechanical Engineering (Engineering and Technology).
A great many industrial processes involve suspensions of noncolloidal particles in yield stress fluids. Investigating the microstructure is essential allowing the refinement of macroscopic equations for these complex suspensions. The interaction of two particles in a reversing shear flow of complex fluids is a guide to understand the behavior of complex suspensions. In this thesis, we study the hydrodynamic interaction of two small freely-moving spheres in a linear flow field of Newtonian, shear thinning and yield-stress fluids. This thesis includes the literature survey, the experimental procedure and the experimental results. In this study, we perform a series of experiments over a range of shear rates as well as different shear histories using an original apparatus and with the aid of conventional rheometry, Particle Image Velocimetry and Particle Tracking Velocimetry. We show that the Non-Newtonian nature of the suspending fluid strongly affects the shape of particle trajectories and the irreversibility. An important point is that non-Newtonian fluid effects can be varied and unusual. Depending on the shear rate, even a yield stress fluid might show hysteresis, shear banding and elasticity at the local scales that need to be taken into account. The flow field around one particle is studied in different fluids when subjected to shear. The results for one particle are used to describe the two particle interactions afterwards. In addition, we show that how a particle-particle contact and a non-Newtonian behavior result in relative trajectories with fore-aft asymmetries. We present well-resolved velocity and stress fields around the particles. Finally, we discuss that how the relative particle trajectories may affect the microstructure of complex suspensions and consequently the bulk rheology.
Sarah Hormozi, PhD (Advisor)
Peter Jung, Professor (Committee Member)
David Bayless, Professor (Committee Member)
Sumit Sharma, PhD (Committee Member)
117 p.
Chemical Engineering; Engineering; Mechanical Engineering; Physics
yield stress fluid; Carbopol gel; hydrodynamic interaction; noncolloidal suspension; suspension; Particle Image velocimetry; Particle Tracking Velocimetry; rheology; particle interaction; Couette flow; simple-shear flow; shear thinning fluid; Guar gum

Recommended Citations

Citations

  • Firouznia, M. (2017). The Hydrodynamic Interaction of Two Small Freely-moving Particles in a Couette Flow of a Yield Stress Fluid [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1502901401749626

    APA Style (7th edition)

  • Firouznia, Mohammadhossein. The Hydrodynamic Interaction of Two Small Freely-moving Particles in a Couette Flow of a Yield Stress Fluid. 2017. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1502901401749626.

    MLA Style (8th edition)

  • Firouznia, Mohammadhossein. "The Hydrodynamic Interaction of Two Small Freely-moving Particles in a Couette Flow of a Yield Stress Fluid." Master's thesis, Ohio University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1502901401749626

    Chicago Manual of Style (17th edition)

ohiou1502901401749626
138
© 2017, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.